lt1: rough idle/bad throttle response=>ecm changing always open/closed loop! - Team Camaro Tech
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post #1 of 2 (permalink) Old Mar 3rd, 07, 06:56 AM Thread Starter
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Markus
 
Join Date: Sep 2000
Location: Germany
Posts: 144
lt1: rough idle/bad throttle response=>ecm changing always open/closed loop!

Hello!
A few days ago I entered the forum with the problem above:


Rough idle/bad throttle response. But the engine (92'Corvette LT 1) starts normal, cold and hot. The rough idle starts after warming up.
Now I used a scanning software and the only thing I noticed was that the engine is always changing between open and closed loop. Could this be normal?
The O2-sensors always have arround 0.5 V. I think this is ok, isn't it?
Last weekend I disconnected the O2 sensors but without any reaction to idling.
Perhaps I could send the data (From TTS Datamaster) to anyone who could handle these data better than me => You're welcome.

69`Camaro, 92`LT 1 / 94' BW-6 speed, shorty headers+Flowmaster, Vette wheels, Eibach/hotchkis springs, koni shocks, Nova rear, Corvette 13" front brake system
[all certified by German association for technical inspection with Oldtimer title]
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post #2 of 2 (permalink) Old Mar 3rd, 07, 08:42 AM
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Jody
 
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Join Date: Jan 2000
Location: Wilton, Ca. USA
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Re: lt1: rough idle/bad throttle response=>ecm changing always open/closed loop!

have you tried replacing the O2's? I'd look there first as they don't give feedback until they warm up, and that's when the problem starts.

I see you have headers; they can also cause problems with keeping the O2's hot enough, though that usually happens with long tubes not shorties. Are your O2's the heated type? I would try a pair of those in place of your stock O2's, will solve both problems (if they're bad or if they can't stay "lit")

Jody


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