fuel trims quit responding
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TECH Apprentice
Joined: Jul 2005
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From: Wilton Ca. (Sacramento)
fuel trims quit responding Doing some datalogging today and I noticed that sometimes while cruising down the road the trims go to "0" and quit responding. The a/f will start moving around a bit at this time since there's no O2 compensation. Then they'll go back after a bit. They might stay off for a minute or more, and it's not when the engine is cold or sitting idling. Are they somehow cooling off or is there something set in my tune incorrectly? I cannot find any correlation on my logs as to why they shut off, or why they go back on. The car uses cast manifolds with heat wrap, so I doubt they're cooling off.
Is there a condition that is met, or a particular dtc that causes the trims to stop responding? I did set a P0430 catalyst efficiency yesterday, but I've seen the trims stop before without setting a code, all the while cruising down the road. Did it again today on a short trip into town.
05 GTO LS2 with twin turbos.
Jody
Is there a condition that is met, or a particular dtc that causes the trims to stop responding? I did set a P0430 catalyst efficiency yesterday, but I've seen the trims stop before without setting a code, all the while cruising down the road. Did it again today on a short trip into town.
05 GTO LS2 with twin turbos.
Jody
Thread Starter
TECH Apprentice
Joined: Jul 2005
Posts: 354
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From: Wilton Ca. (Sacramento)
Originally Posted by brad8266
are you talking about short or long trims? Or both? What are you using to scan also?
Thread Starter
TECH Apprentice
Joined: Jul 2005
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From: Wilton Ca. (Sacramento)
Originally Posted by z-ya
cooked them on your turbo car .
Jody
