distributor and wiring question

[stackz]

Hello, I grabbed a complete engine harness (well I forgot the aldl (or however its spelled) connector so I'll have to go back for that) and ecu from a 1988 truck. it was a 1988 truck and from the code on the ecu the truck was apparently a 4.3 (engine was gone but harness was carefully taken apart making me think they would be coming back for it). ECU was code AKDW. I also grabbed a ARHT ecu from a 92 truck as it was just dangling there. I compared it to a 1989 wiring diagram found online and something didnt look right but going by the sticky thread in here, the diagram looks to compare properly to mine?

http://www.gearhead-efi.com/Fuel-Injection/showthread.php?304-1227747-ECM-Information-42&fbclid=IwAR2HFKcOjm2J0Ai6sTm1N1hpUOsdA-CxRpmFB2SBhIbwd5ur6hLR8uzeETA

https://cimg1.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230319_110224_33488f5d8c70a0c38a8ace9ae367e5b502 89d3a2.jpg

I have a v8 distributor but the internal wires are different colors from the diagram. also, they are kinda hard and shiny wires, are they shielded?
https://cimg1.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230319_110304_f57ef206f961fda759c3f713b1b6fa0bf8 d59102.jpg

ultimately, all of this will go into a 59 chevy apache with a 235 engine. nobody makes a TBI distributor for this engine and dave's small body HEI hasnt been communicating lately (hopefully he is well), so I plan to make my own as I want the ecu to control timing using the 4.3 ecu.

the plan is this:
1. HEI vac advance dizzy from ebay https://www.ebay.com/itm/263484314953?hash=item3d58e39549:g:XFsAAOSwLlJc8FL h&amdata=enc%3AAQAHAAAA4Gtzgr0SNCmPQEJXQO0SBtm8ihRLb RQqxAHhRieB6%2BGJ8MSiJjzouS4B93jE5MqlkhHBKMq1BJrJA 2OUtgAUFnzavhYBCJwoy3U2Rd9GOZq9TpzjPq4tNiAumBUYEQ3 LCVpf0CDx7BbVPn554oJuZUpyd%2F8qxpYqUgkzcGjmyfJMUgY oLfI2MYezSksssT4RRr4FRioe3wuOwZSspfP0XEusw02aSILHi 0%2FUxxSQH8xzSqAzay5idedhKc6BBr01dGjUXYpUVxuCT8fUT 4Vx3q9h2k%2FkC7Av%2BZWxkChU%2BO8P%7Ctkp%3ABk9SR4il mLzfYQ

2. remove vac advance and lock out the mech advance (will probably JB weld or something as I dont have an actual welder).

3. use the pickup wires in the HEI dizzy to connect to the 8pin TBI module I rob from the v8 dizzy I have.

reading this page:
http://www.megamanual.com/ms2/GM_7pinHEI.htm?fbclid=IwAR3PMKUjDGLDXsHh82ZLsAvAZa pV6bARYJhrHalBpdrFu93F5B927yx98Qs

I guess I will need to reverse the wire hookup on the ebay dizzy compared to the factory TBI dizzy? correct? or am I reading it wrong?
will my idea even work? I dont want to do any machining which is why I will just modify the pre-existing ebay HEI. I searched on here and didnt see anything similar and every time I try to use a 3-character search I get no results so I guess thats too short of a search term?

I guess my other two distributor questions are that the ebay dizzy appears to be a 3 wire setup from the picture (red/yellow/black). can I even use its magnetic pickup for the tbi module? I'm guessing there is some weird extra tach wire or something?

per the wiring diagram, the only modules/sensors I'll need are coolant temp, TPS, MAP, IAC, o2 sensor, TBI distributor module. I have a bracket from the 92 v8 truck (it still had the engine) that has the map sensor, the ecs sensor, and some other sensor on the back of it. I assume the IAC/TPS and maybe the coolant temp sensor are on the throttle body itself? I didnt grab the one from the truck as the injectors were missing and I already have a TB hiding somewhere in my garage.

what external inline fuel pump would be good to use for this?

some of my idea came from here:
http://67-72chevytrucks.com/vboard/showthread.php?t=337554
https://www.youtube.com/@drummin52/videos

[dave w]

The YouTube video showed a large cap HEI.

Some mid 80's California emissions I-6 250 Cubic Inch six cylinders used large cap HEI distributors without vacuum advance and 7 pin HEI ignition modules.

Perhaps AC DELCO part number 88864755 is an option? ACDelco Distributor 88864755 | O'Reilly Auto Parts (oreillyauto.com) (https://www.oreillyauto.com/detail/c/acdelco/acdelco-distributor/acd0/88864755)

[Fast355]

The YouTube video showed a large cap HEI.

Some mid 80's California emissions I-6 250 Cubic Inch six cylinders used large cap HEI distributors without vacuum advance and 7 pin HEI ignition modules.

Perhaps AC DELCO part number 88864755 is an option? ACDelco Distributor 88864755 | O'Reilly Auto Parts (oreillyauto.com) (https://www.oreillyauto.com/detail/c/acdelco/acdelco-distributor/acd0/88864755)

The Mexican TBI ones used the 7 pin as well into the 90s GMT400s. Not sure what the port injected 250s used as they had some form of Bosch controller and mass air. I want to say the later 90s up to 2000ish used the 3800 waste fire coils though.

The TBI I6 I setup years ago in a 37 Chevy had dual 1bbl TBIs on a dual carb manifold.

[stackz]

the only thing for that is I havent found anyone who can tell me what the modifications that are needed to be done to convert a 250 dizzy to work on a 235. I have found the 250 TBI units online but cant find even an HEI one just to grab for cheap and bring home to compare them with my spare points 235 dizzy side by side. Thats why I'm thinking just buy the 235 HEI one and modify it to work. my hang up on THAT one is that it looks like 3 or 4 wires are coming out of the thing. a guy on the stovebolt facebook page has one he hasnt installed yet so he's going to take a pic of the guts for me so I can see how many wires are coming out of the magnetic pickup. If there's only 2 then I'd be willing to pay the $100+ to mess with it. but if its got something goofy like 3 wires coming out of the pickup it'll just be me throwing money at the wind.

[stackz]

The YouTube video showed a large cap HEI.

Some mid 80's California emissions I-6 250 Cubic Inch six cylinders used large cap HEI distributors without vacuum advance and 7 pin HEI ignition modules.

Perhaps AC DELCO part number 88864755 is an option? ACDelco Distributor 88864755 | O'Reilly Auto Parts (oreillyauto.com) (https://www.oreillyauto.com/detail/c/acdelco/acdelco-distributor/acd0/88864755)

curiosity got the better of me so I looked at it. saw it has the same external 3 wires as the 235 ebay HEI. put in the part number on google and found it on gm parts direct with additional pics. it gave me an overhead shot of it.
18942

nice. same 2 wire internal pickup as the v8 TBI dizzy I have at home. I'm hoping I see the same when the facebook guy takes a pic of his. if so, I'm just gonna go ahead and grab one and run with it. wont have to worry about any type of machining, etc. just cutting as I'll gut it and then cut the side opening some to fit the TBI module to the old vacuum housing. I've read I'll need to use thermal paste or I'll burn up the module which I've got a bunch of. I'm wondering why the ac delco one has that resistor (or condensor...looks like a points condensor...for noise cancellation like on ford TFI maybe?) in it? and if I would need it with the 8pin module. I dont see one in the dizzy I have but it may be somewhere else in the system originally.

[dave w]

The TBI ECM will work with either 8 pin or 7 pin Ignition module.

The 7 PIN Module is a Super Simple Solution - It can't get any easier or any less complicated.:thumbsup:

Others might not have known how simple it can be to TBI an I-6 six cylinder engine :mad1: If they would have only known.:jfj:

18943

[stackz]

curiosity got the better of me so I looked at it. saw it has the same external 3 wires as the 235 ebay HEI. put in the part number on google and found it on gm parts direct with additional pics. it gave me an overhead shot of it.
18942

nice. same 2 wire internal pickup as the v8 TBI dizzy I have at home. I'm hoping I see the same when the facebook guy takes a pic of his. if so, I'm just gonna go ahead and grab one and run with it. wont have to worry about any type of machining, etc. just cutting as I'll gut it and then cut the side opening some to fit the TBI module to the old vacuum housing. I've read I'll need to use thermal paste or I'll burn up the module which I've got a bunch of. I'm wondering why the ac delco one has that resistor (or condensor...looks like a points condensor...for noise cancellation like on ford TFI maybe?) in it? and if I would need it with the 8pin module. I dont see one in the dizzy I have but it may be somewhere else in the system originally.

hmm, well I asked a question to the seller for the small cap HEI:
https://www.ebay.com/itm/325555728347?mkevt=1&mkpid=0&emsid=e11051.m43.l1123&mkcid=7&ch=osgood&euid=e6501a11b7fc4e6b8aeffa35cfab3798&bu=43195986177&osub=-1%7E1&crd=20230320154307&segname=11051

he responded with an item number saying it had a circuit board in it and not a module, something tells me the small cap units are out lol:
https://www.ebay.com/itm/322377657354?epid=27037526177&hash=item4b0f34ac0a:g:RTwAAOSw1p5kGK7a&amdata=enc%3AAQAHAAAAwI3jlozkkr4j2p32OJSSb2WSiifFt uHzK9A%2Fl5ku%2FG1HoK%2F7tU2hMznp5yY34ZHGWiQ0HBblZ I2DCePyQuyf%2FLcFcvaPsh%2B4UbW0YGcK9RrlvHoj9vJD5uY xdeeojdw12%2FFcBk4YM5UkQoj4%2FVBYFC1oUctqoLtrKMkbJ P0zZzM8QcM%2FXuN6oprjKC2hbd%2B68O%2FjcuvtVK%2FM1ZX u3cbcR7e2lWpqgPdfVAL6eys35mZh4yHOFSqW78kGF1Zc%2FpU Tpg%3D%3D%7Ctkp%3ABk9SR9KfsZTgYQ

hopefully when I hear back from one of the large cap HEI sellers I get better news.

edit: he said the large cap HEI distributors he sells use the standard HEI module so yay for that! sounds like a winner winner chicken dinner to me.

whats the difference between the 7pin and 8pin module? it looks like they do the same thing? just that the 8 pin has a "G" terminal on it? is this an extra ground? I wonder why it has an extra ground?

[dave w]

The 7 pin module has the coil internally mounted inside the Distributor Cap.

The 8 pin module has the coil externally mounted outside of the cap.

The standard 4 pin HEI module is not a good TBI option in my thinking, more like keep banging head on wall and wait for the chicken dinner to hatch. :laugh:

[stackz]

The 7 pin module has the coil internally mounted inside the Distributor Cap.

The 8 pin module has the coil externally mounted outside of the cap.

The standard 4 pin HEI module is not a good TBI option in my thinking, more like keep banging head on wall and wait for the chicken dinner to hatch. :laugh:

yup, and the guy on ebay said the large cap HEI dizzy comes with the 4-wire module. doesnt bother me. it just means it uses the same pickup as OEM which means I dont have to do any machine work at all. All I have to do is open it up, lock out whatever vacuum/mechanical advance is present, toss in and mount/wire up one of the 8pin modules I already have, and wire in the internal HEI coil, and be happy. I'm stoked I dont have to have a custom distributor made or do any machine work, etc.

[dave w]

yup, and the guy on ebay said the large cap HEI dizzy comes with the 4-wire module. doesnt bother me. it just means it uses the same pickup as OEM which means I dont have to do any machine work at all. All I have to do is open it up, lock out whatever vacuum/mechanical advance is present, toss in and mount/wire up one of the 8pin modules I already have, and wire in the internal HEI coil, and be happy. I'm stoked I dont have to have a custom distributor made or do any machine work, etc.

Yep, the 7 pin module is plug and play right out of the box, no machine work, no vacuum advance to lockout . . . just miles and miles of smiles.

[stackz]

Yep, the 7 pin module is plug and play right out of the box, no machine work, no vacuum advance to lockout . . . just miles and miles of smiles.

just curious. whats the best (easiest way) to lock out the vacuum advance? just remove it? I dont have it in hand right now but I assume that as it sits without being in a car as-is any vacuum advance and/or mechanical advance is going to be at base timing internally so lock it where it is? then the ecu can control all the timing however it wants once installed and running.

and I guess...if factory on my 59 235 base timing is 10 BTC. set this distributor up the same? or do I set it at 0BTC (top dead) or something weird?

[stackz]

ok, I ordered one of the large cap HEI distributors off ebay. should be here next week so I can then open it up and have a look at it.

looking back at this page:
http://www.megamanual.com/ms2/GM_7pinHEI.htm?fbclid=IwAR3PMKUjDGLDXsHh82ZLsAvAZa pV6bARYJhrHalBpdrFu93F5B927yx98Qs

the 7pin module is part number LX315, looking it up on rockauto shows me a ton of things it actually came in. once I get the new dizzy here and confirm it has the 4-pin, I will likely use the info I have to hit up the u-pull yard so I can grab a couple 7pin modules and the 5 pin connector harness for dirt cheap.

I'm wondering if there is a male side connector (module side) for the TBI 8pin harness? would rather leave the engine harness I have intact and make a modified connector if possible from the 3 timing pinouts on the 7 pin to the 4pin of the 8pin. here a pin, there a pin, everywhere a pin pin. haha.

[dave w]

If I remember correctly, the 7 pin module and 4 pin module have different bolt patterns.

[1project2many]

the only thing for that is I havent found anyone who can tell me what the modifications that are needed to be done to convert a 250 dizzy to work on a 235. I have found the 250 TBI units online but cant find even an HEI one just to grab for cheap and bring home to compare them with my spare points 235 dizzy side by side. Thats why I'm thinking just buy the 235 HEI one and modify it to work. my hang up on THAT one is that it looks like 3 or 4 wires are coming out of the thing. a guy on the stovebolt facebook page has one he hasnt installed yet so he's going to take a pic of the guts for me so I can see how many wires are coming out of the magnetic pickup. If there's only 2 then I'd be willing to pay the $100+ to mess with it. but if its got something goofy like 3 wires coming out of the pickup it'll just be me throwing money at the wind.

How to modify 230 / 250 / 290 HEI distributor for use in a 235
https://www.trifive.com/threads/will-a-hei-distributor-for-a-250-work-in-a-235.53614/
https://www.jalopyjournal.com/forum/threads/tech-better-late-than-never-easy-235-hei-conversion.189074/

Aftermarket 230 / 250 / 290 HEI distributor
https://www.speedwaymotors.com/Chevy-194-292-Late-L6-HEI-Distributor-Black,455337.html

Converting pre-computer HEI to computer controlled HEI. Includes instructions for removing mechanical and vacuum advance.
https://www.binderplanet.com/forums/index.php?threads/large-cap-hei-dui-distributor-conversion.128469/

The magnetic pickup uses two wires. Green and white or green and yellow. Old HEI, before computer control, only had three wires coming out of the distributor to the cap and one or two from vehicle to cap. Computer controlled has 5, 6, 7 or 8 wires depending on the system and the year. You will use a 7 pin module for your HEI conversion. The HEI distributor used for your TBI swap will have four wires to connect to the ecm and will have three wires to connect to the cap. The cap wires will include power, coil-, and tachometer. You will need to supply power to the cap from the vehicle harness. If you use a tachometer it will likely connect to the cap as well. The module in the distributor linked above will need a notch cut into the side to accomodate the four wire harness that connects to the ECM. The distributor will need to have additional modifications so the 7 pin HEI can be attached to the distributor housing.

[stackz]

How to modify 230 / 250 / 290 HEI distributor for use in a 235
https://www.trifive.com/threads/will-a-hei-distributor-for-a-250-work-in-a-235.53614/
https://www.jalopyjournal.com/forum/threads/tech-better-late-than-never-easy-235-hei-conversion.189074/

Aftermarket 230 / 250 / 290 HEI distributor
https://www.speedwaymotors.com/Chevy-194-292-Late-L6-HEI-Distributor-Black,455337.html

Converting pre-computer HEI to computer controlled HEI. Includes instructions for removing mechanical and vacuum advance.
https://www.binderplanet.com/forums/index.php?threads/large-cap-hei-dui-distributor-conversion.128469/

The magnetic pickup uses two wires. Green and white or green and yellow. Old HEI, before computer control, only had three wires coming out of the distributor to the cap and one or two from vehicle to cap. Computer controlled has 5, 6, 7 or 8 wires depending on the system and the year. You will use a 7 pin module for your HEI conversion. The HEI distributor used for your TBI swap will have four wires to connect to the ecm and will have three wires to connect to the cap. The cap wires will include power, coil-, and tachometer. You will need to supply power to the cap from the vehicle harness. If you use a tachometer it will likely connect to the cap as well. The module in the distributor linked above will need a notch cut into the side to accomodate the four wire harness that connects to the ECM. The distributor will need to have additional modifications so the 7 pin HEI can be attached to the distributor housing.

that last write-up is exactly what I was looking for. it was kind of confusing at first as he apparently pieced it together from a couple distributor builds and I didnt pick up on that at first haha. I see a pic with mech advance springs removed...then suddenly they are back again...like wtf? its also confusing because both of the pics showing the "bracket" he created, they are both different length brackets. one its screwed down super close to the housing mount...the other, it looks to be almost an inch away from the housing mount and he cut off the excess of the bracket.

my HEI is stuck in shipping in Charlotte the past couple of days so I dont have it in hand but I'm curious why he completely removed the vacuum advance unless its for asthetics? I mean if you dont hook it up, it wont be used right? its just kinda sitting there? or do I have it backwards in my head? that its at 0 advance unless it sees engine vacuum?

[stackz]

while I'm waiting on my distributor, at least my intake manifold adapter came in on time. just kinda tossed it on my mockup spare head and its interesting how close the IAC (I think thats the sensor?) is to the valve cover...

18951 I have no clue why the pic is sideways and so small and it wont let me upload another one. oh well.

[TriumphR3]

Hmmm, might have trouble makin that IAC connection.

[stackz]

Hmmm, might have trouble makin that IAC connection.

yeah I dont know why it wont let me directly upload a second pic...

just linking the second pic from another forum. I got this adapter as its got a square base so I can rotate it.

doesnt bother me if its sideways as it'll be easier to get 90s on vacuum connections from cars at the junkyard. the 91 truck 350 throttle cable is extra long as well so I dont care if it swings around in a loop to make proper connection. I can just bend up some flat bar to make a linkage bracket.

https://cimg2.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230328_073004_dc41c691be34dab855bdef68dc5f107340 fbd650.jpg

[dave w]

It appears the TPS is missing? I curious, is it the Early style TPS (3 pin flat) or Late style TPS (3 pin round)?

[stackz]

this is just one I had laying around for mock up purposes. when I go to the u-pull this weekend to grab a couple more sensors/plug connectors I'm going to grab one with all the sensors, mounting bolts and injectors, etc. hoping to score an air cleaner as well. at least these are my "plans" at least. its getting to be slim pickins with the TBI stuff these days.

[stackz]

It appears the TPS is missing? I curious, is it the Early style TPS (3 pin flat) or Late style TPS (3 pin round)?

my harness I have is from an 88 1500 so 3 pin flat (at least I'm pretty sure this is it?):

https://cimg3.ibsrv.net/gimg/honda-tech.com-vbulletin/1008x756/80-20230328_155435_8158a1923679575c076662ec92e1bd3149 d983e1.jpg

any idea what the 2-wire sensor with the inlet/outlet hose is (cant see it in the pic, its attached to the backside of the bracket)? I'm pretty sure the other two are the map sensor and the EST (or ESM)? havent had a chance to go through the harness yet to determine which other sensors I still need to grab. I hope to do that tomorrow or thursday.

I'm going to attempt to grab a complete throttle body with mounting bolts/throttle body riser (or whatever that ring is that sits on top of it) injectors/IAC/TPS as well as a coil with harness connector, fuel lines, o2 sensor connector, and air cleaner assembly. I think thats pretty much all I will need though? I plan to buy a new o2 sensor as all the cat pipes are normally cut off at the u-pull so those are usually missing but I know a 92 truck there still has the connector dangling with whats left of the o2 sensor.

[stackz]

no clue why the pic is so small. per the pic below looks like the sensor not pictured above is the EGR solenoid. the big sensor is the ESC module (will read up on what that does) and yeah, map sensor. so yeah, I think my buy/find list is pretty complete.

18952

[1project2many]

I'm curious why he completely removed the vacuum advance unless its for asthetics? I mean if you dont hook it up, it wont be used right?

Correct. On the carbureted engines used in medium duty trucks and marine applications vacuum advance was often replaced by a flat plate. There are aftermarket copies available. If you do a search for HEI vaccum advance lock out plate you're likely to find a number of vendors.

I'd like to suggest using a throttle body from a 2.8 powered vehicle for your conversion. With the large throttle bores of the 4.3 and V8 throttle body and the relatively low air demands of the engine it may be more challenging to tune small changes in throttle angle. Additionally you will need to work to get fuel delivery correct at idle and low rpm due to the amount of fuel delivered by the injectors. The 2.8 / 3.2 throttle body has much smaller bores and it already includes injectors sized appropriately for a lower horsepower engine.

https://i.ebayimg.com/images/g/k84AAOSwORljmh5s/s-l1600.jpg


the 91 truck 350 throttle cable is extra long as well
If you need a really long throttle cable look for one from a late '80s to mid '90s van. The van wiring harnesses are very long also because the ecm was mounted under the driver's seat.

[stackz]

I'd like to suggest using a throttle body from a 2.8 powered vehicle for your conversion. With the large throttle bores of the 4.3 and V8 throttle body and the relatively low air demands of the engine it may be more challenging to tune small changes in throttle angle. Additionally you will need to work to get fuel delivery correct at idle and low rpm due to the amount of fuel delivered by the injectors. The 2.8 / 3.2 throttle body has much smaller bores and it already includes injectors sized appropriately for a lower horsepower engine.

been sitting and thinking on this. I get the bore sizes and all but the 235 vs the 4.3 (262) isnt that much. I think what you are saying is that I can only reduce the injector duty cycle so much at idle but I can increase it as much as I want. right?

my thoughts.

I get this. maybe I'll start out with the 2.8/3.2 injectors (IF I can find them), would rather not just start buying up new injectors at $60/pop from rockauto vs $5/each at u-pull (if I can find them). Along these lines, I can use the larger throttle and just toss in the smaller injectors and then put the injector size in the tune right? I'm initially going to use the 88 1500 4.3 ecu to get it running but from what I've seen with others...I know I'll need to fine tune this thing or I will always have issues. already eyeballing the for sale sub forum for that pre-chipped ecu with chip. then get a burner or maybe that new ostrich clone? which, if I read right, once I get tune right, burn to chip and be done. but at least the ostrich will let me quickly swap out injectors and change scaling, etc (no, I have not downloaded the tuner software yet, just browsing available videos and such at this point to get up to speed).

I'm still trying to figure out how to delete the ESC/knock sensor as well. If the legacy kit from affordable fuel injection can come with the 7747 ecu with this stuff tuned out and/or bypassed through the wiring, then it has to be sorta simple. I tend to "learn by doing" but with a bit of "pre-education" so while I'm gathering parts, I'm doing my pre-education. it just seems most of the ESC/knock sensor stuff is assumed to be pre-learned from the online stuff I am finding. people just assume you know you can bypass the ESC by twisting wires together. um, ok? which ones?

I assume also the knock sensor stuff is like the EGR stuff and I can eliminate it in the chip itself with a tune?

[stackz]

hmm, learn something new every day I guess....

216/235/261 chevy engine shares the same shaft depth/diameter/oil pump drive as an early landcruiser L6. I will look into other products of such type before I modify this one. so weird that "thousands" have been sold and yet this information is unknown online. I'm honestly baffled.

somebody better download and repost these pics for me as I cant keep these from my other online storage for long lol.
https://cimg7.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230329_144944_352774de7e4d0e241f097c10f684d9f8ce 89f34a.jpg
https://cimg0.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230329_164216_3be6f1d76a12aed5f7683e2a4cc14b93ed f8e9c4.jpg
https://cimg8.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230329_164212_9eb9626d7858bd2e094c4b0fe5970677ee e85163.jpg

ahh pieces to a puzzle. and I cant imagine that after selling THOUSANDS of these that nobody online is chirping up that it doesnt work on their 216/235/261 as-is so I'm gonna run with it!

[stackz]

at 6 minutes and for a completely different reason as compared to valve cover issues...

https://www.youtube.com/watch?v=soQ5_50U7r8

[udidwht]

Hello, I grabbed a complete engine harness (well I forgot the aldl (or however its spelled) connector so I'll have to go back for that) and ecu from a 1988 truck. it was a 1988 truck and from the code on the ecu the truck was apparently a 4.3 (engine was gone but harness was carefully taken apart making me think they would be coming back for it). ECU was code AKDW. I also grabbed a ARHT ecu from a 92 truck as it was just dangling there. I compared it to a 1989 wiring diagram found online and something didnt look right but going by the sticky thread in here, the diagram looks to compare properly to mine?

http://www.gearhead-efi.com/Fuel-Injection/showthread.php?304-1227747-ECM-Information-42&fbclid=IwAR2HFKcOjm2J0Ai6sTm1N1hpUOsdA-CxRpmFB2SBhIbwd5ur6hLR8uzeETA

https://cimg1.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230319_110224_33488f5d8c70a0c38a8ace9ae367e5b502 89d3a2.jpg

I have a v8 distributor but the internal wires are different colors from the diagram. also, they are kinda hard and shiny wires, are they shielded?
https://cimg1.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230319_110304_f57ef206f961fda759c3f713b1b6fa0bf8 d59102.jpg

ultimately, all of this will go into a 59 chevy apache with a 235 engine. nobody makes a TBI distributor for this engine and dave's small body HEI hasnt been communicating lately (hopefully he is well), so I plan to make my own as I want the ecu to control timing using the 4.3 ecu.

the plan is this:
1. HEI vac advance dizzy from ebay https://www.ebay.com/itm/263484314953?hash=item3d58e39549:g:XFsAAOSwLlJc8FL h&amdata=enc%3AAQAHAAAA4Gtzgr0SNCmPQEJXQO0SBtm8ihRLb RQqxAHhRieB6%2BGJ8MSiJjzouS4B93jE5MqlkhHBKMq1BJrJA 2OUtgAUFnzavhYBCJwoy3U2Rd9GOZq9TpzjPq4tNiAumBUYEQ3 LCVpf0CDx7BbVPn554oJuZUpyd%2F8qxpYqUgkzcGjmyfJMUgY oLfI2MYezSksssT4RRr4FRioe3wuOwZSspfP0XEusw02aSILHi 0%2FUxxSQH8xzSqAzay5idedhKc6BBr01dGjUXYpUVxuCT8fUT 4Vx3q9h2k%2FkC7Av%2BZWxkChU%2BO8P%7Ctkp%3ABk9SR4il mLzfYQ

2. remove vac advance and lock out the mech advance (will probably JB weld or something as I dont have an actual welder).

3. use the pickup wires in the HEI dizzy to connect to the 8pin TBI module I rob from the v8 dizzy I have.

reading this page:
http://www.megamanual.com/ms2/GM_7pinHEI.htm?fbclid=IwAR3PMKUjDGLDXsHh82ZLsAvAZa pV6bARYJhrHalBpdrFu93F5B927yx98Qs

I guess I will need to reverse the wire hookup on the ebay dizzy compared to the factory TBI dizzy? correct? or am I reading it wrong?
will my idea even work? I dont want to do any machining which is why I will just modify the pre-existing ebay HEI. I searched on here and didnt see anything similar and every time I try to use a 3-character search I get no results so I guess thats too short of a search term?

I guess my other two distributor questions are that the ebay dizzy appears to be a 3 wire setup from the picture (red/yellow/black). can I even use its magnetic pickup for the tbi module? I'm guessing there is some weird extra tach wire or something?

per the wiring diagram, the only modules/sensors I'll need are coolant temp, TPS, MAP, IAC, o2 sensor, TBI distributor module. I have a bracket from the 92 v8 truck (it still had the engine) that has the map sensor, the ecs sensor, and some other sensor on the back of it. I assume the IAC/TPS and maybe the coolant temp sensor are on the throttle body itself? I didnt grab the one from the truck as the injectors were missing and I already have a TB hiding somewhere in my garage.

what external inline fuel pump would be good to use for this?

some of my idea came from here:
http://67-72chevytrucks.com/vboard/showthread.php?t=337554
https://www.youtube.com/@drummin52/videos

Green/white wires (bottom pic) are for the pick up coil. The magnet reluctor on high mileage units is known to crack. Usually at or near where it's riveted.

[dave w]

hmm, learn something new every day I guess....

216/235/261 chevy engine shares the same shaft depth/diameter/oil pump drive as an early landcruiser L6. I will look into other products of such type before I modify this one. so weird that "thousands" have been sold and yet this information is unknown online. I'm honestly baffled.

somebody better download and repost these pics for me as I cant keep these from my other online storage for long lol.
https://cimg7.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230329_144944_352774de7e4d0e241f097c10f684d9f8ce 89f34a.jpg
https://cimg0.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230329_164216_3be6f1d76a12aed5f7683e2a4cc14b93ed f8e9c4.jpg
https://cimg8.ibsrv.net/gimg/honda-tech.com-vbulletin/756x1008/80-20230329_164212_9eb9626d7858bd2e094c4b0fe5970677ee e85163.jpg

ahh pieces to a puzzle. and I cant imagine that after selling THOUSANDS of these that nobody online is chirping up that it doesnt work on their 216/235/261 as-is so I'm gonna run with it!

I found these A-Team Performance links:

https://swperformanceparts.com/collections/gm-chevy/products/a-team-performance-hei-complete-distributor-65k-coil-for-early-chevrolet-straight-6-41-62-194-216-235-261-68-87-toyota-land-cruiser-fj40-fj60-2f-3f-one-wire-installation-blue-cap

https://swperformanceparts.com/collections/gm-chevy/products/a-team-performance-65k-coil-hei-distributor-early-chevrolet-straight-6-41-62-194-216-235

https://swperformanceparts.com/collections/gm-chevy/products/a-team-performance-hei-distributor-65k-coil-early-chevrolet-straight-6-41-62-194-216-235

https://swperformanceparts.com/collections/gm-chevy/products/a-team-performance-hei-complete-distributor-65k-coil-straight-6-41-62-194-216-235-68-87-compatible-with-early-chevrolet-land-cruiser-fj40-fj60-2f-3f-one-wire-installation-black-cap

https://swperformanceparts.com/collections/gm-chevy/products/a-team-performance-chevy-230-250-292-hei-distributor-black-cap-65k-volt-coil-chevrolet-gmc-6-cyl