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P0505 code + high/fluctuating idle

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Old 03-18-2016, 01:52 PM
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Default P0505 code + high/fluctuating idle

For the past couple months my '97 accord has had a high idle (around 2000 rpm). After it warms up, the tachometer will go back and forth between 1000 rpm and 1500 rpm.

This is what I have tried:

-cleaning the IACV
-replacing the IACV
-cleaning the air intake and the throttle body

I have not tried looking at the coolant or for a vacuum leak.

Yesterday when I took the air intake off, I put my finger on the top hole of the throttle body, and the engine stopped surging and the car was acting fine again.



Does anybody have any advice?
Old 03-19-2016, 12:37 AM
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Default Re: P0505 code + high/fluctuating idle

What top hole? What does it connect to?
Old 03-19-2016, 04:58 AM
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Default Re: P0505 code + high/fluctuating idle

The upper hole inside the TB goes to the IAC.

For giggles, what are the colors of the two wires that are plugged into the IAC?
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Old 03-21-2016, 08:20 AM
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Default Re: P0505 code + high/fluctuating idle

vacuum leak
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