Rep Power: 0

Im have idle problems again. Code p0505 - IAC valve... My thing is i just replaced the IAC valve with a brand new one less than 6 months ago. I checked the plug and it is secured well. I have a 00' with a jdm d15 with vtec head and 3 stage vtec. The car idles at 1000rmp and when i rev it the idle fluctuates between 1000 and 1500 before settling back down @ 1000>

The last time i had this problem it was the intake mani gasket, i just tore the motor down and did a head gasket and replaced all other upper gaskets so that shouldnt be it, any other ideas on what it could be and where to look? maybe wire harness somewhere or a vacuum leak in a hose?


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http://s653.photobucket.com/user/all..._0504.mp4.html

 
Rep Power: 157

first off, there is only 1 ecu to run that motor correctly, a P2J I believe. there are a couple diff ones for different OBD2a and OBD2b's. I don't know a whole lot about them, but based off a quick search that is what I found.

Did you bleed out the coolant system properly.? that will also cause the IACV to make a fluctuate.

 
Rep Power: 0

The car ran fine for over a year with the ECU in it so I don't think the wrong ECU is the problem.

The radiator is full and it ran fine after all the last work I did to it.
How can I bleed the system to make sure I don't have any air pockets?

I pulled the coolant hoses going to the intake and IAC Valve, checked them and they all appear to be fine.

 
Rep Power: 157

set the front of the car up in the air to help. Open cap, turn heater on and let the car run so the fan comes on a couple times, and add coolant as needed. I usually do mine for awhile just to make sure. another issue, that I had once, was the FICV under the Throttle Body was out of adjustment. which caused my car to idle really high and smoke a bit.