PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Rolling only high idle???

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Old Dec 31, 2011 | 09:52 PM
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Default Rolling only high idle???

Sorry, Not sure if this is the correct place for this question.
My car (a 2000 M6 camaro) idles high when you are driving (hot or cold) when you push in the clutch or take it out of gear still rolling until the car slows down.
The car has to be going about 20mph before the idle slows down to about 900rpm. When it's rolling faster than 20mph it stays idled up at about 2000rpm.
Not sure what the deal is! It revs up and comes right back to idle just fine sitting still....
Anybody please help!!!
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Old Dec 31, 2011 | 10:05 PM
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The throttle body closes all the way. Its free and smooth. I can run the car sitting still and it idles down as soon as i let off the throttle. The only time it idles high is when the car is rolling over about 20mph.
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Old Jan 1, 2012 | 01:32 AM
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Throttle cracker adds a speed dependent airflow that the motor
does not need, especially if it has other bypass air (vac leak etc.).
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Old Jan 2, 2012 | 02:11 PM
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Originally Posted by jimmyblue
Throttle cracker adds a speed dependent airflow that the motor
does not need, especially if it has other bypass air (vac leak etc.).
Sorry. Newbie here. What exactly is the throttle cracker? The tps or the iac? Should I be looking to replace sensors or replace vacuum hoses?
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Old Jan 2, 2012 | 02:17 PM
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My car did the same thing, turned out to be the tps sensor which had become covered in oil over time. I cleaned mine by using rubbing alcohol and drying it out.
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Old Jan 2, 2012 | 06:11 PM
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Mine does that too, but mainly on the HW. It'll rev to about 1800 when I floor the clutch. Throttle cracker was never touched; still stock settings. I'm curious to figure it out too.
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Old Jan 2, 2012 | 07:52 PM
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He means the throttle cracker table in the tune itself needs to be lowered. When you modify the base tables in tunes, you effectively throw off alot of others. The tuner just needs to modify the throttle cracker table in the troubled mph spots.. .
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