just picked up an '86 fiero

[34blazer]

SE model, 2.8 3spd auto. engine runs a little rough so i want to hook up the lappy to it and look at the datastream. just curious if anyone knows which ecm came with these.



https://www.facebook.com/media/set/?set=a.4598879896412.189337.1424726674&type=1&l=9230c55f64

[RobertISaar]

not sure of part number off-hand, but i do know it's a $24 or $24A car. 160 baud.

[34blazer]

not sure of part number off-hand, but i do know it's a $24 or $24A car. 160 baud.

7170 ecm sound right?

[RobertISaar]

according to the Ludis C3 interchange, yes. 1227170 for 86-88, 1226869 for 85.

[34blazer]

according to the Ludis C3 interchange, yes. 1227170 for 86-88, 1226869 for 85.

sweet thanks! im going to convert it over to a 7730 as well, ludis have pinouts for it on his site? if so, can i have the link? thanks!

[RobertISaar]

http://www.exatorq.com/ludis_obd1/

i would think that would be a very popular and documented swap, maybe on some fiero forums?

[Six_Shooter]

http://www.exatorq.com/ludis_obd1/

i would think that would be a very popular and documented swap, maybe on some fiero forums?

Yeah, I've seen few posts about the Fiero '7730 swap. IIRC Pennock's Fireo forum has plenty of information about it.

[34blazer]

awesome thanks fellas! gonna go out and hook the lappy up!

[JP86SS]

I have 350 roller motor that would go well with the 730 in there :)

[34blazer]

I have 350 roller motor that would go well with the 730 in there :)

lmao! the guy i bought it from has 2 others and 1 of them is a 90's lambo countach conversion. this little bugger will be a nice A-B commuter for awhile. the mustang is killin me on gas, even with hiway mode enabled lol.

just hooked the lappy up to the car, turns out winaldl interfaces with the ecm in 10K mode. looks like the egr is toast and the tps needs adjusted, its reading 12.5% at idle. could explain why its hard to start and not very responsive.

[1project2many]

That original ecm can be swapped to two bar MAP and run with a turbo.

Just sayin'.

[34blazer]

lmao, the blazer is gettin the turbo. fiero stays stock for now. speaking of stock......

anyone know where the vacuum(in kpa) should be for the stock engine. its been so long since ive had one with a stock cam lol

[RobertISaar]

stock LH0 likes to idle around 35-40kPa. IAC counts usually around 20 or so.

[34blazer]

base idle is 800ish rpm right? thanks for the quick reply!

[RobertISaar]

automatic LH0 idle down near 650 when fully warmed.

manual are close to 800.

[34blazer]

oh yeah its def a vac leak, doesnt want to idle that low and kpa is in the 40's.

[Six_Shooter]

Check with a mechanical gauge as well, there could be a failing MAP sensor, or corroded wiring causing a higher than normal reading. Actually, just grab a multimeter and check for proper voltages and such at the components, don't assume that everything is good. ;)

[phonedawgz]

Might be too old however -

Most of the time the vacuum leak on the 2.8 Fieros is the metal tube running from the upper intake to the EGR valve. It is hard to find the leak since the tube is covered with insulation. Cut a strip of aluminum can the width of the UPC and slip it between the upper intake and the tube. 10MM headed screws hold it in. Take off the dist cap and you can reach it with the manifold on. If that knocks down your idle speed, you know your tube is leaking.

Many (including myself) have done the '7730 swap. The stock ECM updates so slow the idle tends to surge up and down. The 7730 fixes that, along with having much more tune-ability. Use the $88 tune if you are retaining the distributor.

http://gmtuners.com has a re-wire chart that is downloadable just for this swap.

[34blazer]

Might be too old however -

Most of the time the vacuum leak on the 2.8 Fieros is the metal tube running from the upper intake to the EGR valve. It is hard to find the leak since the tube is covered with insulation. Cut a strip of aluminum can the width of the UPC and slip it between the upper intake and the tube. 10MM headed screws hold it in. Take off the dist cap and you can reach it with the manifold on. If that knocks down your idle speed, you know your tube is leaking.

Many (including myself) have done the '7730 swap. The stock ECM updates so slow the idle tends to surge up and down. The 7730 fixes that, along with having much more tune-ability. Use the $88 tune if you are retaining the distributor.

http://gmtuners.com has a re-wire chart that is downloadable just for this swap.

i had the upper intake off last week and found that someone had made a blockoff plate for the broken tube. the TPS was replaced but not adjusted right, fixed that and solved the hard starting problem and lack of throttle response. fixed some vac lines but it still has a high idle, going to pull the entire intake off next week and replace all gaskets and eliminate the cold start injector. already have a 7730 on the bench along with the green plug and wiring diagrams/pinouts ;) im planning on using S-AUJP V4 since its more developed and compatible with the 6er. i hate how the 7170 needs the 10K resistor to datalog, and runs it in diagnostic mode. since the egr is blocked off its already not running right, plus the higher commanded idle. any other vac leaks thats common on these? thanks!

[phonedawgz]

The other common place for a substantial vacuum leak is the internal O ring in the throttle body that the IAC tube fits into. It is right below the main bore on the intake face of the throttle body. The O ring can easily get pushed out of it's internal groove.

[34blazer]

The other common place for a substantial vacuum leak is the internal O ring in the throttle body that the IAC tube fits into. It is right below the main bore on the intake face of the throttle body. The O ring can easily get pushed out of it's internal groove.

are you running $88? i was thinking of using that to get this car to pass smog and switch to $8D afterwards. i remember looking at fasteddi's $88 last year and the adx needed alot more info, im not that knowlegable yet and adding items to the adx to add my own.

[phonedawgz]

Yes I am running $88.

[RobertISaar]

i just released a full $88 XDF here and on 60V6 BTW.... should be quite an improvement compared to the one that's been floating around on the internet for at least the past 5 years.

[34blazer]

i just released a full $88 XDF here and on 60V6 BTW.... should be quite an improvement compared to the one that's been floating around on the internet for at least the past 5 years.

awesome, my goal now is to convert to the 7730 by next weekend lol

[EagleMark]

i just released a full $88 XDF here and on 60V6 BTW.... should be quite an improvement compared to the one that's been floating around on the internet for at least the past 5 years.I just looked at the XDF you made... :yikes:

Nice! :thumbsup:

[34blazer]

just swapped the 7730 in today and loaded up $88. started right up and i let it idle for awhile. running much better, well was.... went to the store, came back, started it up and went to move it out of the garage. started to run rough and then quit. now it will fire and run for about 1/2 second and quit. now it has me second guessing the pinout diagram it got from gmtuners, the injector grounds at D6/7 are grounded directly to the block. also, just checked, fuel pump will no longer prime key on. my weekend is over so i will try and find the time to look at the wiring diagrams and see if the fuel pump relay is wired different. had my hopes up too....:(

[34blazer]

*fixed* finished connecting misc connections(VSS, fuel pump circuit at E13) and found i had the TPS signal on the wrong pin. was at E13 instead of F13, oops. i dont understand how it ran like that for the 5 min it was running, but apparently it didnt like that too much. started right up this time. just need to finish re-upholstering the door panels and headliner, finish polishing and waxing, and reassemble.

[phonedawgz]

The main functions of the TPS is to see if the throttle is closed, and the idle controls should take over, and to see when the throttle is quickly opened.

[34blazer]

oh i know, what baffles me is that before i finished up the wiring, the car ran flawlessly, even revved it a few times without a problem. then it crapped out. not sure what happend but it runs now. going to run it for a few minutes to see what happens.

[34blazer]

just went out and ran it, started the datastream and it was sending errors with no data. only way i could get it to connect was to unplug the aldl connector and plug it back in while TP was connecting. it idles pretty well, can rev it no problem. if i try to hold the throttle open, it stalls right out. tps readings dont match either, voltage looks good from idle to WOT, but the % doesnt match, goes above 200% at WOT. not sure if something is goofed in the adx. tried SAUJP setup for 6 cyl, it connects right away but everything fricken blinks like a christmas tree. tried to fire it with SAUJP and it fired and shut off. ran out of time for the night but im not sure to call it a step forward or 3 steps backward.

[34blazer]

well heres a datalog from running it today. SAUJP doesnt work for some reason. so im working with $88 from now on. figured out that i used the wrong MAP signal wire to F15. was only showing .33V and the other green map signal wire was showing 2.5V(key on engine off), also verified by backprobing the map connector. also showing 5V on the ref wire. still doesnt show voltage in the datastream, still reading .33v. not sure what the hell is wrong, going to work so i have no more time to figure out the issue. TPS % is incorrect, ill have to change the equation to match the actual voltage displayed. any suggestions?

*and it wont let me upload the .csv file*


thanks!

[RobertISaar]

2.5 volts at atmospheric pressure sounds a lot like a 2BAR MAP.

[34blazer]

well its the same MAP that was on the blazer, that didnt have problems running on the 7747. theres a few things goofed somewhere. even TP doenst connect right away like it does on the other cars, sending a bunch of errors before it properly connects. i also tested the ground on the map circuit, iirc 50 ohms, the sound test barely made any noise.

[RobertISaar]

50 ohms on the ground circuit? that's...... very bad.

[34blazer]

50 ohms on the ground circuit? that's...... very bad.

yep, time to check the grounds. just had the complete intake off last week and prolly left a ground off somewhere:rolleyes:

im also going to try and post up a log with the SAUJP adx to show you whats going on with that. it connects fine with $88, sorta, after about a minute of sending errors. SAUJP connects fine with my other car just fine.

[34blazer]

had like 3 minutes today before work to look around the cramped engine bay for any loose ground wires. cant seem to find much other than a ground strap. anyone have a diagram of physical locations of the grounds? i suspect they are all on the backside of the engine where i cant see them very well

[RobertISaar]

alldata is refusing to give a nice diagram of where they are, but i did grab a text list.

http://i.imgur.com/aB9e6.png

[34blazer]

Thanks for the ground locations! just went and checked and everything is where it should be. went on to inspect the map sensor connector a little more closely, found that the sheath around the ground pin was broken off at the base of the connector. it wasnt making a good connection with the map sensor, obviously, so i got it to line up and now it reads properly. also got SAUJP working properly, found that the 1026B.bin is corrupted. used a known working bin that was running fine with the mustang and changed the cyl select, along with a few other params. starts and runs fine now. just need to install a knock sensor, E fan relay trigger wire, and the 7730 swap is complete.