Question about Acura TL

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Idle goes up to 2000rpm then fluctuates to 1500 to 2000 then when operatin temp idles to 900

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This sounds like a faulty idle air control valve (IAC). A leaking vacuum line could also cause these symptoms. Check for vaccum leaks, and then for faulty connections at the IAC. It is located near or in the throttle body. If no leaks are found, disconnect wiring to IAC. If behavior is the same with IAC disconnected, the IAC probably needs replacement. Sometimes they can be cleaned, but this usually doesn't help for long. You can probably also get resistance specs for the IAC from the dealer and check the IAC resistance with a ohmmeter to see if it is OK. If the IAC is OK and there are no obvious vac. leaks, you might have an intake manifold leak. This can be tested by aiming an UNlit propane torch at the base of the intake at different points with engine running. If the idle increases in response, the intake is probably leaking. This is unusual on Hondas/Acuras, though.

Posted on Dec 12, 2009

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I had a honda accord do the same thing. The problem was that i had a vaccum leak. Let your car idle and just listen around for a air leak under the hood. You have to listen closely. My leak was a hose that fell behind the throttle body and went attached near the brake booster. When you find it, the place it goes should be the lenght of the hose away.

Posted on Dec 12, 2009

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