Running lean after battery change.
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Member
Joined: May 2014
Posts: 448
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From: Alpine
Car: 86 Trans Am
Engine: 305 LB9
Transmission: 700r4
Running lean after battery change.
Hey guys. Recently my tpi has started running rough at idle and around 1200 rpm. It happens during a battery change. If I remove the ground and reset the computer sometimes it runs perfect for ever. Until I accidentally leave a light or something on and the battery drains and I recharge it and put it back on. And it requires me to mess with it some more. Is this a computer issue? I replaced all known vacuum leaks
Joined: Dec 2004
Posts: 16,737
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Running lean after battery change.
The ecm has some learning /correction it will do. Disconnecting the battery erases sam @"stay alive memory ".
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Joined: Sep 1999
Posts: 3,871
Likes: 24
From: Mass
Engine: 350 TPI
Transmission: A4
Axle/Gears: 3.23
Re: Running lean after battery change.
How do you know its running lean? Like mentioned above, the ECM will lose its saved memory once the battery is removed or disconnected but the car should have no problem starting backup and running fine.