Hello all, I have a 2005 fx4 and just recently started knocking,(always has a little) always change the oil and use motorcraft 5-20. also tried some lucas but no better. It seemed to happen after the truck sat a while(two weeks) and I started it and it seemed to be missing then that cleared up but the knocking continues. could this be oil pump? it runs fine and pressure seems good what do you guys think? and does it just need a tune up? 156,000 miles
There are lots of things that could be wrong. With that mileage i would suspect cam phaser or vct solenoids if it only knocks at low rpm less than 1500. If it continues even as you rev the motor i would suspect a lifter or the timing chain tensioners/guides. Mine had both the lifter and timing tensioner guides shot at 172k even though the motor was clean with no sludge. If the tensioners are shot you will here a bad rattle at startup for 3-10 seconds.
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