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Irratic Idle help

 
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samson_420
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PostPosted: Thu Jul 05, 2012 3:46 pm    Post subject:  Irratic Idle help Reply with quote

Hey, yall. . . I haven't been on here for quite a bit. The Impala has been doing great without issues, till now.

We just did a 19 hour drive to nowhere and back in the AZ heat. The car ran great the whole way until I let my retarded friend drive it(I doubt that's what did it). He drives like a retard maniac just flooring the car off the line every time. . . Douche bag

But either way, the car never over heated. Just got to the half mark and that's it. . . But, when we were getting close to home I noticed it was idling a little rough at times. Then I noticed the idle will just stay high at times even while driving. It will idle and drive @ 35MPH without your foot on the gas, but not always(maybe about 50% of the time).

I looked everything over and it looks fine so far. But, I haven't started taking anything apart. I googled it and found anything and everything from intake manifold gasket to IAC.

Any help would be greatly appreciated. . . Never had any other problems with the car for 60k except when the harmonic balancer fell apart, cooling fans started squeaking & the radiator cracked. Nothing major though.

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IffyG
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PostPosted: Thu Jul 05, 2012 4:29 pm    Post subject:   Reply with quote

Ever cleaned your throttle body? At one point mine was sticking slightly open due to a large amount of carbon built up around the plate. I pulled it, removed the sensors and cleaned the carbon off, put a new gasket on and put it back together and everything was good to go.

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Lingenfelter
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PostPosted: Thu Jul 05, 2012 5:25 pm    Post subject:   Reply with quote

Also related, if you sprayed throttle body cleaner straight into the throttle body without removing the sensors, you probably buggered the teflon on the MAF sensor wires, thereby ruining the sensor.

Edited: MAF sensor not O2 sensor....derp.

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Last edited by Lingenfelter on Thu Jul 05, 2012 8:03 pm; edited 1 time in total
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samson_420
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PostPosted: Thu Jul 05, 2012 5:57 pm    Post subject:   Reply with quote

Time to tear into it a bit, I need it running solid.

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02ImpalaDude
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PostPosted: Thu Jul 05, 2012 6:05 pm    Post subject:   Reply with quote

my vacuum lines had a slight crack in them and my car did the same thing. just replaced the lines and problem fixed.
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topgun
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PostPosted: Thu Jul 05, 2012 6:23 pm    Post subject:  idle. Reply with quote

I'd go with what IffyG said to start with. Cool

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2001Ls
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PostPosted: Thu Jul 05, 2012 6:59 pm    Post subject:   Reply with quote

I had a similar problem. For me it set off a code and was the MAF sensor.

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samson_420
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PostPosted: Thu Jul 05, 2012 11:53 pm    Post subject:   Reply with quote

Gave it the GM once over, cleaned the MAF, the throttle body, air filter and swapped the IAC. Runs like a different car.

The IAC was getting stuck for some reason. And the change that you can notice is the MAF cleaning. It's one of the most important sensors. I seen a Monte Carlo buck like a horse and Aamco couldn't figure it out. I just swapped it for the one on our car and it ran perfect. Then cleaned the old one and it was just fine.

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IffyG
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PostPosted: Fri Jul 06, 2012 10:21 am    Post subject:   Reply with quote

Glad to hear it was a relatively simple fix.

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Wingman520
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PostPosted: Fri Jul 06, 2012 11:33 am    Post subject:   Reply with quote

IffyG wrote:
Glad to hear it was a relatively simple fix.


x2... glad it wasn't expensive to repair

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samson_420
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PostPosted: Fri Jul 06, 2012 12:50 pm    Post subject:   Reply with quote

Sort of. . . . I took it for a nice long drive last night. Drives perfect but the SES light popped on.

But, this could be caused by me driving around for a bit with the IAC disconnected. But, no driving or idling funk at all.

We'll see. . . .

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IffyG
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PostPosted: Fri Jul 06, 2012 12:57 pm    Post subject:   Reply with quote

I'm surprised the car ran with the IAC disconnected. It might have caused the SES light, but you'd need a scanner to be sure.

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samson_420
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PostPosted: Fri Jul 06, 2012 4:46 pm    Post subject:   Reply with quote

Ha ha, got it scanned. . . 0443. . . Oops I forgot to connect the evap solenoid. I broke the tube coming off of it. I took it off and JB welded it up then reinstalled it. Then forgot to connect it. Connected it back up, the SES light went away after one restart.

I love GM, nice & simple s**t.

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