PLease Help wrong ECM and Prom
Thread Starter
5th Gear
Joined: Apr 2008
Posts: 5
Likes: 0
PLease Help wrong ECM and Prom
Hello,
I have a 1985 Camaro with a 350 87 vette motor. Found out that it still has the 1985 305 Camaro ECM and prom in it... Would the casting numbers on the vette help? If so does anyone know where they are cause i can not find them. How am i supposed to get the right ECM and prom for the new motor to get it to run right? THANKS FOR THE HELP GUYS!!!
I have a 1985 Camaro with a 350 87 vette motor. Found out that it still has the 1985 305 Camaro ECM and prom in it... Would the casting numbers on the vette help? If so does anyone know where they are cause i can not find them. How am i supposed to get the right ECM and prom for the new motor to get it to run right? THANKS FOR THE HELP GUYS!!!
Drifting
Joined: Feb 2006
Posts: 1,423
Likes: 96
From: Magnolia Tx
Are you using the injectors from the 350 or the 305? The rest
of the two set-ups are near enough the same to run ok. The
real hardcore prom board is www.thirdgen.org. Good luck with
it. benny
of the two set-ups are near enough the same to run ok. The
real hardcore prom board is www.thirdgen.org. Good luck with
it. benny
Thread Starter
5th Gear
Joined: Apr 2008
Posts: 5
Likes: 0
i am using the injectors from the 350 and im having alot of problems with it.... I talked to a few people and they said that i have to use the prom and ecm from the vette......will the casting numbers help with getting the new ecm and prom if so where are they cause i did not see them.... thanks alot for the help
Drifting
Joined: Feb 2006
Posts: 1,423
Likes: 96
From: Magnolia Tx
The ecm should be the same. The proms are different, but the
casting numbers don't matter. A 350 is a 350. The ecm doesn't
know or care where it came from. I don't burn my own proms
so i don't want to mislead you here. benny
casting numbers don't matter. A 350 is a 350. The ecm doesn't
know or care where it came from. I don't burn my own proms
so i don't want to mislead you here. benny
Drifting
Joined: Mar 2002
Posts: 1,251
Likes: 2
From: Thomson Georgia
The only stupid question is unasked.
The 85 camaro had a tpi on it right? If so, it should be the 165 ECM.
All things being the same, auto to auto and manual to manual.
You should be able to use a 85 350 prom, available from the dealer, if they're still available.
If you used the 85 wiring harness, all you should need is a prom, or a bin file for a 350 camaro
What kind of problems are you having, be a bit more specific.
The 85 camaro had a tpi on it right? If so, it should be the 165 ECM.
All things being the same, auto to auto and manual to manual.
You should be able to use a 85 350 prom, available from the dealer, if they're still available.
If you used the 85 wiring harness, all you should need is a prom, or a bin file for a 350 camaro
What kind of problems are you having, be a bit more specific.
Thread Starter
5th Gear
Joined: Apr 2008
Posts: 5
Likes: 0
ok so i was looking and you are right the ecm's are the same..... its and 87 350 tpi.... so the problems i am haveing are: 1. surge in the idle after a few min after startup... 2. damn thing is dumping fuel like there is no tomorrow.... 3. Sounds like there is a valve tap 4. when driving for the first few mins the car hesitates... but then what prom do i use i heard there about 6 diffrent ones? Do i use any 350 prom? thanks for the help
Drifting
Joined: Mar 2002
Posts: 1,251
Likes: 2
From: Thomson Georgia
Need to check fuel pressure...do any necessary tests, too high, too low, no hold, make sure vacuum is hooked up, 8-10 psi change with vacuum on / off.
Check MAF connections, no tears in bellows between MAF and TB clamps good and tight, all vacuum hoses on TB, don't forget one on bottom.
EGR leaking?
Prom should be easy, 85 camaro, 350, gears, auto/std, get a new prom, or reprogram yours. If still available from dealer, around $60.
Check MAF connections, no tears in bellows between MAF and TB clamps good and tight, all vacuum hoses on TB, don't forget one on bottom.
EGR leaking?
Prom should be easy, 85 camaro, 350, gears, auto/std, get a new prom, or reprogram yours. If still available from dealer, around $60.
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Thread Starter
5th Gear
Joined: Apr 2008
Posts: 5
Likes: 0
Changed the MAF, going to check the fuel pressure regulator tomorrow. I was just reading up on the ecm's and proms the 1227165 ecm is not for my 85 camaro but like you said it is for the 87 350 so I think i might have to change that.... the dealer is being a pain about the proms they want the prom # from the 87 350 before they do anything....so thats no help lol but i did find a website i just dont know which would be for me
I did not see an egr leak.
http://www.iroczone.com/techartpromid.htm
I did not see an egr leak.
http://www.iroczone.com/techartpromid.htm
Last edited by delta2634; Apr 17, 2008 at 01:09 AM.
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
STOP.Forget the engine you are now using came from an 87 Corvette. The ECM in your F body(1226870) will attempt to manage whatever is there just as if it was the original 5 ltr. I am making a very bold assumption that when you did the swap you also swapped all the sensors from the old engine to the new one. The car should run but not very well.Not real sure but I suspect it would be very lean. If you can find a PROM from an 85 Corvette OR have your PROM reprogramed to that config the car should run just fine. To learn more about ECM/PROM/ go here:http://www.cruzers.com/~ludis/c3xref.html
Two added thoughts: the PROM from an 85 5.7L F Body will work. ECM/PROMS from the 85 era are becoming more and more difficult to locate. If all else fails there is a way to upgrade to a later (Corvette 86-89) ECM for which PROMS can be had.
Two added thoughts: the PROM from an 85 5.7L F Body will work. ECM/PROMS from the 85 era are becoming more and more difficult to locate. If all else fails there is a way to upgrade to a later (Corvette 86-89) ECM for which PROMS can be had.
Heel & Toe
Joined: May 2009
Posts: 18
Likes: 0
From: Crestview Fl
the 1985 tpi emc was the 1226870. The camero was only available with the 5.0 and the corvette came with the 5.7. The computer is the same with a the 5.0 or 5.7 prom. The 85 also was the only year to have the MAF burn off module.
