High idle issue, need help please

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Jul 19, 2008 | 07:16 AM

timcohomerepair

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High idle issue, need help please

My 2000 Ranger (manual, 3.0) has an idle that sticks at between 2-3000 rpm depending on how far depressed the gas pedal was when driving, and revs up even further before slowly dropping to 1200. It does this sporadically when at operating temp. I changed the IAC and it was great all that day, and now doing it again. Would MAF or TPS be next? Is there a way to diagnose? I have heard of a high idle repair kit, is this for my truck? No check engine light, just high idle....

Thank you, Tim
SLC, UT

Jul 19, 2008 | 01:59 PM

scrapyardking

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First thing I would check for is any vaccume leaks around the throttle body. Thats what caused mine to do the same thing.

Jul 19, 2008 | 03:34 PM

Pablo-UA

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and try to clean IAC... use tb cleaner. I used TB cleaner and carb cleaner.....

Jul 20, 2008 | 09:04 AM

timcohomerepair

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Thank you both. Can I spray carb cleaner around the throttle body to check for vac leaks? Or water? What is the best way to check for this? Because the rpm it sticks at depends on how far the pedal was depressed, I was thinking throttle position sensor....no?

Tim

Jul 20, 2008 | 10:05 AM

Pablo-UA

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yes, you can.

but you can unscrew IAC, close its holes with fingers and ask someone to start engine. If idle is slower, may be IAC valve got stucked. So remove IAC solenoid and clean it inside

Jul 20, 2008 | 01:17 PM

timcohomerepair

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I replaced the IAC 3 days ago with a new one. I will inspect it, but am reluctant to clean out a new part. That is why I was trying to move on to other possibilities.

Thanks for any input or advise,

Tim

Jul 20, 2008 | 02:10 PM

timcohomerepair

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update...I sprayed good carb cleaner all around the throttle body and around the intake manifold (not every square inch was accessble on the intake manifold) and the idle did not jump or flail. I then cleaned off the throttle butterfly face and it runs better. Can the throttle posisition sensor be cleaned?

Tim