Question about 2004 Ford Expedition
PCV has nothing to do with drivability or any thing else pertaining to engine performance. It regulates the air flow out of the crankcase to burn blowby gases from the rings. It never needs to be replaced,just cleaned every four years. That is if you have no hose leaks.
Buy some CRC Throttle Body Cleaner and follow instuctions.
I wouldn't even run engine,just spray and clean throttle plate.
Plate is sticking open and throwing TPS Voltage off at idle. PCM is trying to figure injector pulse, with wrong info,thus rough idle.
Posted on Sep 28, 2010
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Posted on Jan 02, 2017
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