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Old 06-16-2007, 08:43 PM
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Default RE: 2001 accord idle problem

P0505 is Idle Control System malfunction. Quite a few things can cause this; IACV mechanical problem (dirt, grime, blocking valve movement); Fast idle thermo valve, throttle body dirty clogged port, intake manifold leak, intake air leak, vacuum line leakage, ECT sensor fault, or throttle position sensor fault.

Most likely IMO would be clogged or failed IACV, air leak, or vacuum leak. IACV is easy to check. Disconnect and if no change in idle (it should drop low to 600-700 rpm), then IACV has electrically failed or is clogged so badly the valve can't move (clean w/ throttle body cleaner).

There is a farily lengthy diagnostic for this problem that needs to be performed to isolate the fault. You need a Honda shop manual for your vehicle.

good luck
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Old 06-16-2007, 10:04 PM
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Default RE: 2001 accord idle problem

Usually a bad iacv, i've replace hundreds of em. You can check it by pulling off the air intake and put your finger over the idle air port.
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Old 06-17-2007, 12:55 PM
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Default RE: 2001 accord idle problem

What is it?
4-cyl VTEC?
4-cyl non-VTEC?

For the 4-cyl engines, it's like this...

You don't have a FITV. Somewhere around '96 they included that function into a new-type AICV.

The AICV is bolted to the back of the intake manifold. Back against the firewall.

The EGR is on the intake manifold, it's a round disk thing, usually has a green sticker on it.

Better pictures if I knew which engine...
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Old 06-19-2007, 11:45 PM
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Default RE: 2001 accord idle problem

Your IACV is under the throttle body, #2. I think Honda included the function of the FITV into the IACV across all it's engines by 2001, but I'm not sure. Anyway, I didn't see any FITV or EGR with a quick look thru a couple parts drawings. I don't have a V6 so I don't have a proper repair manual for it.

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Old 01-23-2008, 08:02 PM
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Default RE: 2001 accord idle problem

the car will always be driveable if there was no idle air control valve because of the throttle plate stop screw. plus the fact that you can just hold the gas pedal down slightly to keep it running. it sounds like you have a vacuum leak with a surging idle. it needs to be tracked down and elminated. a new idle air control valve will not fix a vacuum leak, but a vacuum leak can set a p0505.

when you say the egr was replaced, are you talking about the egr valve and the egr port cleaning? if so, there may be a problem with the throttle body gasket.
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