bad ecm

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04-03-2013, 11:53 AM

tcrisp

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Car: 1989 camaro iroc

Engine: 350 tpi

Transmission: auto

Axle/Gears: 323

bad ecm

What are some sign that your ecm is going bad ?

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04-03-2013, 01:13 PM

Tuned Performance

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Car: 1967 Camaro, 91 z28

Engine: Lb9

Transmission: M20

Axle/Gears: J65 pbr on stock posi 10bolt

Re: bad ecm

If its the 1226870 ecm would be a wise idea to upgrade to the 1227165 ecm.
Signs of a bad ecm are erratic running when you hit large bumps or pot holes, low serial data live voltage or lack of communication with the ecm via the mil or aldl.

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04-03-2013, 01:49 PM

Caveman305

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Car: '89 RS, '89 Iroc

Engine: L03, LB9

Transmission: 700r4, T5

Axle/Gears: 2.73, 3.08

Re: bad ecm

i went through problems with erratic idle and stalling with my car, replaced damned near everything, the one clue that tipped me off about the ECM being bad was that when trying to pull codes by jumping a/b on ALDL the SES light would flash 12.....12......1.........3...........2, it would be giving codes but fading in and out so bad you had no idea what it was trying to tell you, after replacing my ECM my erratic idle/stalling problem dissapeared and i could pull codes fine