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  #1  
Old 07-14-2011, 05:46 PM
propilot908 propilot908 is offline
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Default IAC Trouble

Hey guys alright heres the deal my engine idles funny when in park and in drive. the rpms go up and down. I have cleaned my Mass air flow sensor and cleaned my IAC valve like no other (a lot of carb cleaner lol). Dont know what to do next. replace the IAC valve or what? Oh and when i unplug my iac valve the idling issue does go away. thanks
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Old 07-14-2011, 05:48 PM
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Default Re: IAC Trouble

Replace the IAC, I killed mine when I cleaned it
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Old 07-14-2011, 06:00 PM
propilot908 propilot908 is offline
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Default Re: IAC Trouble

alright ill try that. another question i know it has nothing to do with engines but i was thinking about a 2inch leveling kit. will it be able to fit 31s? and what is the best brand
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Old 07-14-2011, 06:01 PM
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Default Re: IAC Trouble

You may, but I'm not too versed on that with the older trucks and springs
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Old 07-14-2011, 06:36 PM
propilot908 propilot908 is offline
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Default Re: IAC Trouble

back to to the IAC valve is there anything else it could be? like TPS or something else ha
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Old 07-14-2011, 06:44 PM
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Default Re: IAC Trouble

I would think its just the IAC. I did the same thing and worked on it for 2 days thinking it was the TPS when it was just the damn IAC
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Old 07-15-2011, 06:37 PM
propilot908 propilot908 is offline
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Default Re: IAC Trouble

just changed the iac valve and it still did the same thing. so i put the old one in unpluged it, started my engine turned it off pluged it back in and now check engine light is on. wtf
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Old 07-15-2011, 06:42 PM
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Default Re: IAC Trouble

Wtf??!!
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Old 07-15-2011, 06:53 PM
propilot908 propilot908 is offline
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Default Re: IAC Trouble

thats what i said
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Old 07-16-2011, 07:13 AM
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Default Re: IAC Trouble

Need to know what the code for the check engine light is.
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Old 07-16-2011, 12:07 PM
propilot908 propilot908 is offline
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Default Re: IAC Trouble

yeah im about to go borrow my neighbors code reader to find the code
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Old 07-17-2011, 06:49 PM
bassmaster bassmaster is offline
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Default Re: IAC Trouble

did you check all of your vacuum hoses? i've never had a car idle with the IAC unplugged unless there was a vacuum leak.btw i've also been sold a bad iac before...long shot but still possible
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Old 08-10-2011, 12:42 PM
propilot908 propilot908 is offline
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Default Re: IAC Trouble

hey just to let you guys know my engine light did go off. but my problem still persists with the ideling. heres the deal when im in drive and stoped at a light or what ever and can see my voltege meter go up and down with the the up and down idleing my lights also dim too. could it be a bad alternator or a bad tps???
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Old 08-10-2011, 08:17 PM
webster426 webster426 is offline
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Default Re: IAC Trouble

I would check the alternator, it is possible it is reducing your RPMS when the throttle is not engaged. Do not, however, rule out the IAC.
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Old 08-13-2011, 10:28 AM
propilot908 propilot908 is offline
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Default Re: IAC Trouble

is there a way to check the alternator?
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