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Thread: Which ECM should I use?

  1. #1
    Electronic Ignition!
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    Which ECM should I use?

    Im putting a Cadillac 4.9 (92 Deville) in my 86 Fiero GT. Isthe 1227747 the one I need to use or would the 122730 be better? If I’m correct the Deville has the cam sensor in the dizzy so the 7747 should work. Or am I smoking crack and way off point? And yes there will be more N00b questions cause I’ve never done this and I’m learning.

    Thanks for any insight!


  2. #2
    Super Moderator dave w's Avatar
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    I recently set up a 16197427, converted to MPFI Mode, on a Cadillac 4.9 liter using an older Cadillac HEI Distributor without vacuum advance / with a 7 pin ignition module. Custom PROM chip required. Details on TBI to MPFI attached.

    dave w
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  3. #3
    Electronic Ignition!
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    holy shiznit, cant thank you enough!

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    Super Moderator dave w's Avatar
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    The injectors are re-wired for Bank - One ( Injectors for cylinders 1,3,7,7) and Bank - Two (Injectors for cylinders 2,4,6,8). MPFI is just like a Chevy 350 Tuned Port Injection (TPI) engine, all four injectors on Bank - One spray fuel, then all four injectors on Bank - Two spray fuel at a rate of Once Every 4th Distributor Reference Pulse (DRP).

    dave w

  5. #5
    Electronic Ignition!
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    Can't thank you enough, you wouldn't happen to have a wiring diagram would you?

  6. #6
    Fuel Injected! S.O.B.B.'s Avatar
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    Dave w I'm curious. The 4.9 u set up did it use a tbi throttle body for iac use.as I understood the tbi ecms do not have a driver for isc that 4.9 pfi throttle body uses.that was part of why I asked about using the 2240 ecm.other part was in reading on a fiero site they seem to make using the 2240 very easy if the engine is stock.custom prom required for vats etc depending on transmission. I already know I'm going to use the 7427 and adapted a dodge throttle body for my pfi set up but it would be nice to see alternatives.also was there a reason u did not use the electronic hei distributor from the 4.9.did that have to do with phasing? Please do tell
    Last edited by S.O.B.B.; 08-25-2018 at 06:58 AM.
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    87 sjimmy powered by a 92 cadillac 4.9L pfi on 7427pcm /700r4/ 8.8 3.55 rear/disc brakes.

  7. #7
    Super Moderator dave w's Avatar
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    The distributor was from an 1988 Cadillac Seville, 4.5 Liter. The 1988 Seville Ignition Module works well with the 16197427 PCM.

    The Throttle Body was from a 1994 Chevy Pickup, 5.7 Liter. Fabrication Required

    1994 C2500 5.7 / 4L80E liter schematics attached.


    dave w
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    Last edited by dave w; 08-25-2018 at 07:25 AM.

  8. #8
    Fuel Injected! S.O.B.B.'s Avatar
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    The icm is same part number for the 4.5 and 4.9 distributor and is also same for corvette. I was going to go back to the small cap distributor that I made by using the cadillac bottom and pickup coil with the small cap bolted to the top and the 2 shafts merged and adjustable phasing but reading the 7427 works fine with 4.5 distributor I think I'll stick to the cadillac distributor since I have an 89 4.5 in place on current set up and the new set up is 92 so 2 to choose from.thanks for the reply since this wasn't my post.hopefully it's usefull info to P.O.L. Mafia.Dave w please keep that bin file.if I have any troubles I may want to purchase a copy.
    Jeeper
    87 sjimmy powered by a 92 cadillac 4.9L pfi on 7427pcm /700r4/ 8.8 3.55 rear/disc brakes.

  9. #9
    Fuel Injected! S.O.B.B.'s Avatar
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    A couple of notes.cadillac 4.1 4.5 4.9 use same icm.I just picked up a couple right side exhaust manifolds off e bay for 4.1.they are stainless tube style.almost like a block hugger header but even shorter.anyway I got them because the cast iron manifolds seem to Crack a lot.both are cracked on the 92 deville I just got.but they look like they'd suit a fiero engine bay pretty good with a few mods.
    Jeeper
    87 sjimmy powered by a 92 cadillac 4.9L pfi on 7427pcm /700r4/ 8.8 3.55 rear/disc brakes.

  10. #10
    Fuel Injected! S.O.B.B.'s Avatar
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    20180825_181958.jpg 4.1 manifolds.both were listed as right side.I just wanted them to modify for my jimmy.they will outlast the mild steel headers I made that are on it now.hth
    Jeeper
    87 sjimmy powered by a 92 cadillac 4.9L pfi on 7427pcm /700r4/ 8.8 3.55 rear/disc brakes.

  11. #11
    Electronic Ignition!
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    Lot to digest, thanks again Dave, very much appreciated. S.O.B.B. I looked at those headers but they were 150-200$ on ebay a piece and they don't dump out where I want them to. I thought about getting a set and cutting them up to dump where I want, but it would be easer to have plates made and make my own headers from scratch, which I will most likely end-up doing.

    Is there a doc to show how to hookup a computer on a bench and program it without it being in the car?

  12. #12
    Fuel Injected! S.O.B.B.'s Avatar
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    The set I have now I made myself. Cost me 60 bucks for a vw van header that had enough bends to make the set.I cut the plates from 3/8" plate and used a set of gaskets as a starter template.I did these by eye b4 I swapped the v8 and I was off a bit and had to make adjustments. But they work and sound pretty good.I lost my pics from my phone but there are clearer pics under my user cp.20170423_181031.jpg the tubes are 1.5" as I couldn't make 1.625" fit in plate.the exhaust ports are pretty small.the ecm does not need to be hooked up to program it.if u look back through one of my posts Dave w sent me a link that gave a good tutorial on chip burning and such.it takes reading it over a few times but once u learn it it's very simple.post #18 from my which fuel injection system is best for cadillac 4.5 pfi. There are also pics of what needs to be done to burn chips.I took the cheap way but moates has all u need for doing it with new parts manufactured just for this.hth it's a lot of reading but we'll worth the benefits of being able to change just about anything.
    Last edited by S.O.B.B.; 08-26-2018 at 05:38 PM.
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    87 sjimmy powered by a 92 cadillac 4.9L pfi on 7427pcm /700r4/ 8.8 3.55 rear/disc brakes.

  13. #13
    Super Moderator dave w's Avatar
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    Quote Originally Posted by P.O.L. Mafia View Post
    Is there a doc to show how to hookup a computer on a bench and program it without it being in the car?
    With very few exceptions (94/95 LT1 computers), 1986 - 1995 OBD1 computers use chips.

    Moates.net is a good source for software and hardware to program chips. http://support.moates.net/beginners-programming-chips/

    Getting started: http://support.moates.net/obd1-gm-getting-started/

    dave w

  14. #14
    Fuel Injected! S.O.B.B.'s Avatar
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    Screenshot_2018-08-26-14-32-22.jpg Screenshot_2018-08-26-14-31-54.jpg if u see these from different angles it's not hard to cut the outlet and point where u want and cut off the down pipe outlet and weld a cut piece of tube over the hole.I've seen a few custom sets of headers for 4.9 fiero and a few looked cry close to the head like the factory 4.1 manifold. I just liked that they are stainless.
    Jeeper
    87 sjimmy powered by a 92 cadillac 4.9L pfi on 7427pcm /700r4/ 8.8 3.55 rear/disc brakes.

  15. #15
    Carb and Points!
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    I can't believe I stumbled across this... I just picked up a 94 Cadillac deville with the 4.9 to drop in the 86 fiero that started off as a gambler 500 rig. I have the vehicles and an assortment of parts, including the intake manifold/tb/fuel rails off the Allante...
    This thread came up as I was trying to learn just how to and what's needed to program the chip.
    I'm planning on keeping the 4t60e trans from the caddy

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