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2005 sunfire possible throttle body/IAC clog?

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Sep 4, 2014, 11:35 AM

Post #1 of 2 (921 views)
2005 sunfire possible throttle body/IAC clog? Sign In

I have a 2005 Pontiac Sunfire with a 2.2 Ecotec engine with 47779 miles on it. It has a new air filter and plugs, wires etc. Yesterday while driving home from work, I had the a/c blasting (it is ice cold and blows perfectly) and when I cam to a stoplight, it started to hesitate like it wanted to stall. The issue subsided when I turned off the a/c. I drove it 60 miles home and it drove perfectly as long as the a/c was off. I figured it was the idle air control valve and was going to fix it after payday on friday. This morning when I went to go to work, the a/c was off and as I was backing out, it started to hesitate again. The frequency of the chugging or hesitation is sporadic and it is worse when idling in drive. The check engine light is not on and when scanned, there are no codes. The repair guide notes that there is a special coating on the throttle body and can not be cleaned. I can research the problem, but I have never worked on a car before so I have no idea what I'm doing or I would clean it myself. If I take it to a shop and they clean the fuel system would this most likely solve my problem? The repair guy on the phone suggested it was a bad a/c compressor, but according to all the things I have looked at with my issues, it points to gunk in the TB or IAC. Not that it really matters, but I am a female and when I take my car in, I just want to know as much as I can on the possible things wrong to avoid them trying to sell me anything I may not really need. Thank you for any input. I appreciate it!

Ultimate Carjunky / Moderator
Discretesignals profile image

Sep 4, 2014, 12:04 PM

Post #2 of 2 (910 views)
Re: 2005 sunfire possible throttle body/IAC clog? Sign In

Did this problem start after the spark plugs, air filter, and boots (not wires) were replaced? Important to use OEM plugs in that one because the ignition control module synthesizes the camshaft position signal based off capacitance during the ignition events.

This sounds like a misfire at idle speed from your description. Someone is going to have to use a scan tool to monitor the datastream to see how the PCM is commanding the IAC, to look at misfire counters, and view fuel trims.

You could attempt to clean the throttle body. Cleaning it with throttle body cleaner, rag, and a toothbrush shouldn't hurt anything.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

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