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Old 06-24-2011, 10:09 AM   #601

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Originally Posted by PQ View Post
I never had any legit idears.

But I thought in a closed loop system that the o2 sensors tell the computer when and when not to add how ever much fuel based on it's reading.

I'll ask Ron when I get a chance.
You sir are correct! I'm doing some lookin' and have found this so far. The sensor mentioned in this writeup doesn't pertain (except the O2 sensor) and looks like it could be it;

My idle surge was a result of the following situation:

The idle switch is depressed (foot off the gas)
Too much air is getting through the throttle body (ISC stuck open)
O2 sensor registers lean mix (too much air)
ECU adds fuel to achieve correct mix
RPMs increase due to increased fuel/air supply
At 1500 RPM the ECU goes into decel mode and cuts fuel (*)
With only air coming into the engine, the RPMs drop rapidly
At 1200 RPM the ECU turns the fuel back on
Goto 2.
Still reading. But this could be it. The writer also stated he never got a cell because the O2 sensors were doing what they were supposed to and sending the correct signals. However, after much much $$$ at a dealer, they found an exhaust manifold leak.
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Old 06-24-2011, 10:33 AM   #602
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yeah...header leaks even on my turbo buick screw with the O2 sensor big time. They can toss the tune for a loop.
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Old 06-24-2011, 10:47 AM   #603
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Funny thing is I had been through all of that reading (albeit, not that particular article) and STILL didn't think it was an exahust leak.
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Old 03-21-2012, 04:29 PM   #604
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Bump for reference.
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