ECM Replaced, won't run now?
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Junior Member
Joined: Nov 2017
Posts: 7
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From: Big Island
Car: 1987 Iroc Z28
Engine: originally 5.0 now 5.7 Block
Transmission: 700r4
ECM Replaced, won't run now?
Replaced the ECM in a 1987 Iroc z..because you couldn't pull codes from the old one and the service light would stay on. It would run with old ecm.
So I installed a new ECM with the prom from the old one.. now you can get the code 12 diagnostic but the car won't run. it will start for a second and die.
Just wondering if any body else has had this problem and if so what was done to resolve it?
So I installed a new ECM with the prom from the old one.. now you can get the code 12 diagnostic but the car won't run. it will start for a second and die.
Just wondering if any body else has had this problem and if so what was done to resolve it?
Joined: Dec 2004
Posts: 16,927
Likes: 1,016
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: ECM Replaced, won't run now?
Sounds like you might of got a bad ecm. Do the fans come on koeo ?
Joined: Dec 2004
Posts: 16,927
Likes: 1,016
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: ECM Replaced, won't run now?
Sounds like a bad ecm out of the box or not the same service number. 1227165, 16198259, 88999194, 77-7165.
Thread Starter
Junior Member
Joined: Nov 2017
Posts: 7
Likes: 0
From: Big Island
Car: 1987 Iroc Z28
Engine: originally 5.0 now 5.7 Block
Transmission: 700r4
Joined: Dec 2004
Posts: 16,927
Likes: 1,016
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: ECM Replaced, won't run now?
The fans on with the key on is a sign of a bad ecm or the memcal is not seated.
Joined: Feb 2017
Posts: 4,185
Likes: 576
From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: ECM Replaced, won't run now?
Are you positive that every pin on the chip made into the socket and none folded under?
IDK, but can the chip be installed backwards?
IDK, but can the chip be installed backwards?
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Joined: Dec 2004
Posts: 16,927
Likes: 1,016
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
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