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Old 02-07-2011, 09:46 PM
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Idle speed

I have a 2003 with a I6 and it idles at 450 to 500 rpms. What can I do to raise it? Seems like it's running too low. Thanks in advance.

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Old 02-07-2011, 10:06 PM   #2
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The idle is entirely computer controlled, there is no idle adjustment screw like there is on a carbureted vehicle. Mine idles pretty much that same rpm most of the time. But it's still possible your IAC (idle air controller) is dirty and not letting all the air in for idle that the engine requires. The IAC is what provides all of the engine's air at idle rpms.

You can clean it with an aerosol throttle body cleaner and a toothbrush. What you clean is the IAC's plunger, shown below, and the hole in the throttle body that plunger fits into which is where the idle rpm air passes through and into the air intake manifold. Don't push/pull/spin the shaft, and the IAC is only held in by two small (T-25 IIRC) torx bolts. They are tight since they are Locktited into place so be sure to have a good sharp fresh torx adapter and the best type would be turned by a 1/4" ratchet wrench to give a little more torque to overcome the Locktite.

You might get away with just spraying the aerosol throttle body cleaner into the throttle body with the engine running per the directions on the can. Direct some of the spray at the air passage inlet slot which will be sucked in if the engine is at idle rpms. The engine may stall at idle rpms when it sucks in the cleaner, no problem just restart the engine. The IAC will only suck the cleaner in through the slot at idle rpms so you'll have to keep it as close to idle rpms as possible in order to have the best chance of cleaning the IAC without physically removing it.
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Old 02-07-2011, 10:25 PM
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Hey thank you very much. I will give that a try. You think 500 rpm is too low?
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Old 02-08-2011, 12:03 AM   #4
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As I said above, my '04 seems to idle about that same rpm but I think my '97 was more like 700-800 RPMs. 500 seems a bit low but I cleaned my IAC and throttle body several months ago which didn't change a thing so I'm thinking it must be ok. No Check Engine Light so I'm not overly concerned about its idle rpm.
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