Question about 2004 Ford F150

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My truck has a knocking noise in the engine, they tell me the problem is the timing belts is that true

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Not exactly. If you increase engine RPM to 2000 and the noise goes away it is your "Cam Phasers".
There is an extended Warranty for this problem and it has Mileage limits, something like 75,000 miles.

Contact a Dealer regarding this "Silent Warranty" as there are Service Bulletins on this problem. The belts the repair shop mentioned are actually timing chains and the "Cam Phasers" control them. This is an expensive repair if not covered. Something between $1500 and $2400.

It requires a removal of the front of the engine.

Posted on May 27, 2010

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3) In idle, flash the strobe. If the knocking appears to be twice that of the strobe, you can conclude it's something in the lower half of the engine. Generally, crank journal main bearings make a worse metallic ringing under load. Connecting rod bearings usually quiet down under load if they're worn as the extra slack is taken up by cylinder pressure.
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