1998 Honda Civic Repair Question

Topics covered: Engine, Sensor, Vacuum leak.
Mileage: No information provided.

Asked on October 19, 2008

1998 Honda Civic P0505 code

Engine Performance problem
1998 Honda Civic 4 cyl Two Wheel Drive Manual 169,00 miles

I searched the archives. I have checked for vacuum leaks, none, taken off the IAC valve, cleaned it and replaced it. Checked the ohm test on it and it was ok. It goes about a week before it comes on after reset. Does this valve slowly fail?

Asked by johannw

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Replied on October 19, 2008

Here’s a list of some of the other things that need to be checked before replacing any more parts. The throttle body for a clogged port or improper adjustment. The intake manifold gasket for leakage. The intake air hose for being loose and leaking. Vacuum leaks in general. Incorrect engine coolant temperature sensor output. On some models incorrect throttle position sensor output. Then you get down to the wiring from the computer to the idle air control valve or the computer.

Answered by jnovack (expert)
757 answers provided

Replied on October 19, 2008

I had done the first four suggestions and the temp sensor. The throttle position sensor I had not checked it yet and will look at that. Also I had pulled off an engine bracket to look at the wiring to the valve, it was said the bracket rubs the wires and they were fine. I also tested the voltage in the wire at the valve and computer.