Porsche 928 Idle Air Control Valve

If the revs on your Porsche 928 starts to go up and down while idling, it may be the idle air control valve. Here is how I fixed my issue.

[@louannwatt4447]

Thanks ! Doug

[@sagronkit]

Great!!!!

[@realdata1378]

Great video. Pls help more. I have rpm rev hunting issues.

[@carcrazy9288]

This is how I fixed mine. kzbin.info/www/bejne/jH2boZ6Qjt2EkJI

[@tomashedmanstromhielm2751]

Did u fix the vaccum leak? I have the same sound at the same spot. Thanks!

[@carcrazy9288]

Yes. It was coming from one of the fuel injectors. I was able to fix it by replacing the problematic one.

[@gazfish]

That’s not an idle control valve, it’s a basic valve to raise the idle when the AC is on and is simply on or off. Cleaning it probably made no difference to your problem, fixing the vacuum leak is the solution. P.S. You need to put a cap and cover on the jump post to prevent shorting the battery with a wrench.

[@peterschmidt1453]

I was thinking that was such a convenient location on that model engine. On the 32V S4 engine (87 onwards) the IACV is under the MAF, to get to it I believe the whole intake manifold and MAF module have to be removed. Mine is fine at the moment, but I will buy a new one as this is a definite replacement item, along with the hoses, crank position sensor and intake manifold vacuum actuator all positioned under the intake manifold and impossible to service without major surgery.