Check engine light not coming on.
Thread Starter
Junior Member
Joined: Feb 2012
Posts: 75
Likes: 2
From: Northern California
Car: 1987 Iroc Z28 Camaro
Engine: 5.7 TPI
Transmission: 700R4
Check engine light not coming on.
My check engine light just stopped working. No light light when I loop a and b to set timing.
Any thoughts?
Any thoughts?
Joined: Dec 2004
Posts: 16,754
Likes: 996
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Check engine light not coming on.
First off you need to disconnect the est and set the timing not jumper a to b to go into diagnostic mode. you can check the ses bulb or with the engine running you should have power on pin a5 brn/wht at your ecm
Thread Starter
Junior Member
Joined: Feb 2012
Posts: 75
Likes: 2
From: Northern California
Car: 1987 Iroc Z28 Camaro
Engine: 5.7 TPI
Transmission: 700R4
Re: Check engine light not coming on.
already disconnected the est and timed it, all the manuals say to jump a to b on the adal or what ever. This car is smog equip.
Joined: Dec 2004
Posts: 16,754
Likes: 996
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Check engine light not coming on.
Thread Starter
Junior Member
Joined: Feb 2012
Posts: 75
Likes: 2
From: Northern California
Car: 1987 Iroc Z28 Camaro
Engine: 5.7 TPI
Transmission: 700R4
Re: Check engine light not coming on.
read the manual. It says to jump a to b disconnect the est, set timing, pull jumper a to b, shut off car. reconnect est, disconnect neg batt for 30 seconds. to reset any codes.
Not that complicated. Still no check engine light.
Not that complicated. Still no check engine light.
Joined: Dec 2004
Posts: 16,754
Likes: 996
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Check engine light not coming on.
check you fuse , you check engine light bulb and than if thats ok and you have power at pin a5 of the ecm with the engine running than bad ecm. not that hard
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