Question about 1990 Ford F150

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I changed out spark plug wires last week 1990 Ford f150 Lariat. This week it sounds like a hard knocking from engine after driving 10 to 20 miles. Is my timing off by just changing the spark plug wires?

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  • Larry Trisch
    Larry Trisch Mar 19, 2011

    What is the oil pressure guage reading when it starts to knock. I have seen these build up sludge in the oil pan and after a short drive will clock up the pick-up tube screen cutting off the oil and causing it to knock. May not even be related but it's something to check.

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Knock at low rpm and high rpm" It may be oil pump , After oil heats up it gets thinner and and less lubracated. I would change the oil and add some oil stabalizer, shouls help, if not probaly a rod.

Posted on Mar 19, 2011

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I live in NY and cold and I have a 1999 F150 pickup 4x4 with Triton V8 engine. Truck has only 64,000 mi on it. I only drive the truck only a few miles a week but do start it up every other day. Recently...


The problem may be simple. Since you only drive it a few miles a week the engine never gets to full operating tempature long enough to keep the spark plugs and the cylinders clean. You should drive the truck at least 10 to 15 miles a week at one time to keep the carbon from building up in the cylinders.
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