Idle adjustment
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Junior User
Joined: Feb 2006
Posts: 95
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From: Hampton Falls, NH
Idle adjustment
So I unhooked my "recently replaced" idle air controller and it didn't affect the engine's idle at all. I know the IAC is good like i said it's new. What do I need to do to lower the idle so the IAC controls it.
Postmaster
Joined: Oct 2008
Posts: 3,026
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From: Renton, WA
First you gotta check for vacuum leaks. The IAC is just a controlled vacuum leak.
Second is the throttle closing all the way, pull off the throttle cable and see if the idle changes.
Last there should be an adjuster/stop for the throttle so it can close more.
Second is the throttle closing all the way, pull off the throttle cable and see if the idle changes.
Last there should be an adjuster/stop for the throttle so it can close more.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Lets backtrack a bit here.
I gather you have an idle problem so you changed the IAC?
You may have a bad TPS sensor, did you pull the codes? If not do that ASAP and you could also measure the TPS with a multimeter to ensure it doesn't have any dead spots and is within spec.
I gather you have an idle problem so you changed the IAC?
You may have a bad TPS sensor, did you pull the codes? If not do that ASAP and you could also measure the TPS with a multimeter to ensure it doesn't have any dead spots and is within spec.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
First of all, NEVER adjust the idle manually. When the throttle plates are closed, they should be airtight.
If you have a new IAC valve, and unplugging it didn't kill the truck, then air is getting into the plenum from somewhere. Check for a vacuum leak.
Your throttle body could probably use a good cleaning, too. Take it off and clean all the carbon out. You'll be very pleased at how well your truck idles when you're done.
If you have a new IAC valve, and unplugging it didn't kill the truck, then air is getting into the plenum from somewhere. Check for a vacuum leak.
Your throttle body could probably use a good cleaning, too. Take it off and clean all the carbon out. You'll be very pleased at how well your truck idles when you're done.
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