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Idle drops down sometimes

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  #1  
Old 07-22-2008
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Idle drops down sometimes

Sometimes when I come to a stop the trucks idle will drop down to like 500rpm or less and shake like its about to stall, but only for a few seconds max and then it goes away. It doesn't happen often, but more then I like. It has new oil and plugs, air filter looks pretty new and clean, last week did sea foam in the vac line. I need to still put a new fuel filter in it since I don't know hold old the one that it has now is, as well as run sea foam in the gas tank for 1 tank.

Any ideas? I have 60k miles btw.
 
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Old 07-22-2008
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my only idea is to adjust the idle higher than you normally have it. that way, when it does drop down and shake, it will drop down to ur normal idle speed. also, check the idle control wire thingy, dont know wats it called, but the wire. remember the guy who just broke his?
 
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Old 07-22-2008
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It's probably your IAC (Idle Air Control) valve. You can try taking it apart, and cleaning it first, but more than likely, you will have to replace it.
It's mounted on the throttle body, and looks a lot like this:


 
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Old 07-22-2008
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Originally Posted by Trucker_Eric View Post
my only idea is to adjust the idle higher than you normally have it. that way, when it does drop down and shake, it will drop down to ur normal idle speed. also, check the idle control wire thingy, dont know wats it called, but the wire. remember the guy who just broke his?
The only way to adjust idle speed is with a PCM tuner.
 
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Old 07-22-2008
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Originally Posted by Takeda View Post
The only way to adjust idle speed is with a PCM tuner.
a little screw that moves the accelerator cable...
 
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Old 07-22-2008
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Originally Posted by Trucker_Eric View Post
a little screw that moves the accelerator cable...
That screw is not intended to adjust idle speed!!! By turning it, you can screw-up things like the TPS idle voltage.
 
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Old 07-23-2008
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It's your IAC... go get it replaced with a brand new one, cleaning them is just a band-aid.

I just got mine replaced and it doesn't do that anymore.
 
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Old 07-23-2008
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Mine used to do taht too...I wouldn't doubt I need a new IAC. Mine did it because of the pullies.
 
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