Posted by David G on March 30, 2019 at 17:54:18 from (209.181.208.169):
We got back to the idle surge on the 2002 Civic today.
The surge is common on them if there is a vacuum leak, or issue with one of the idle valves. It operates different than most fuel injected cars, where they will run very fast if there is an intake leak. The Honda will shut off the fuel injectors if the idle goes above about 2000, then turn them back on when below 1000, so it surges on and off. It is really wacky how they handle fast idle, there is a bypass that has a mechanical plunger in it that closes off the large bypass when the coolant that flows through it warms it. This valve is mounted right on the throttle body. If the large bypass does not close when computer thinks it should, the computer then starts the surging.
I closed off the intake with my palm, and the engine died, so that told me that there was no intake leak, even though the computer said PVC leaking, that is where the half wrong comes in.
I then restarted the engine and allowed it to surge, I pinched off the IAC bypass and could control the idle speed by changing how much it was pinched off. I got it to idle real smooth by me controlling the air bypass. I am going to replace the valve, think that will solve the issues.
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