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2003 impala won't idle
12-17-2013, 06:32 PM
Post: #1
2003 impala won't idle
The car started to not idle. I unpluged the MAF sensor and it ran a little better for a day or two. Then I replaced the IAC sensor and left the other unpluged ran ok but not right. Replaced the MAF sensor and it still won't idle. The only codes it was showing were for the MAF, O2 sensors and one for the gas cap. Do you think if I clean the O2 sensor it will help? I am going to put another gas cap on also.
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12-18-2013, 12:26 AM
Post: #2
RE: 2003 impala won't idle
I have never seen a practical way to clean an O2 sensor and if it's running right it will be self cleaning anyway. (burning off the black carbon deposits) There is no IAC "sensor" as the IAC is an actuator motor controlled by the ECM.

What I would do is clean the IAC (Idle Air Control) plug everything else back in then clear the codes and see what comes back. Since there is no code specific to a gas cap I would be leary of just throwing a new cap on there. Most likely the code is "evap leak" (large or small) which can be a bunch of things including a rusty tank filler neck... or the lip of the fill neck has a dent and the cap will not seal. If you can give us the exact codes it would be helpful.

If you don't know how to clean the IAC then let us know and we can walk you through it. It's something that needs doing every few years and if it's never been done then it's way over due. You can also clean the MAF with the same stuff. Certainly worth a shot to save a few bucks before replacing parts.
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12-18-2013, 02:52 PM
Post: #3
RE: 2003 impala won't idle
I replaced both the IAC and MAF. The code was evap leak the guy at auto zone said most likely gas cap. I.m going to switch one from my other car. He also said it could be the things you said. But since it is cold here and it is easy to switch them that is what I thought I would try first.
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12-18-2013, 10:39 PM
Post: #4
RE:
Since the evap test only happens about once a week (in most cases) you will still need to clear the codes and see if that stays away. While the guy may "fix" many vehicles with a new gas cap the real issue is usually one that gets dropped on the ground then a speck of sand sticks to the gasket. The other thing I see in my fleet is people who don't screw the cap on tightly. When you go to the "click" try pushing in a bit at the same time. It makes a difference, especially in cold weather when that seal is a bit stiff.
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