Question about 1997 Ford F150 Regular Cab

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I have a loud clicking, tapping noise coming from my 1997 F150 4.2 liter engine truck while it is running. The noise gets faster as I increase throttle. When it first started this I had a lot of white exhaust smoke, but now I don't have any white smoke. Oil level is normal, oil pressure is normal. I did a block combustion test and there are no vapors escaping into the coolant. The truck does not skip or shut off unless I shut it off, just that loud clicking noise. What could it be?

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The valves may need to be adjusted, sounds as if one has become a little loose. If not, one of the valves may be sticking. I would drain about 1 1/2 quarts of oil from the engine, put in a engine cleaner and run for about 5 min then drain all the oil. You may have to do this only once, but if the valve is sticking badly it may take another cleaning. It will cost a little to clean the engine $20 or so but not as much paying someone to break it down to do the same thing. Good Luck.

Posted on May 02, 2010

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