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06/12/2023 1:03 pm
Topic starter
I have a low mile rust free 04 Explorer with the 4.0L. Two OBD codes PO401 EGR & PO174 PCV valve. The motor makes a loud screeching noise at 3200 rpm, either while driving or in park, from the rear of the engine and has a rough idle. Not sure if it's a vacuum leak or what. Its left two local mechanic's and even my local Ford Dealer service unable to diagnose.
A few things they ruled out are, clogged catalytic converters and timing chains.
1 Answer
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06/12/2023 6:24 pm
try taking off the serpentine belt.
Other than that , trying cleaning out the EGR system and replace the PCV valve.
Might be too much blowby from worn out pistons.
