Question about 2007 Ford F-150 Harley Davidson

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1988 f-150 engine knock under load

When in drive or over drive the truck has a knock under load( mostly hills). However if you are light on the gas it does not knock. I checked the timing (dead on) and checked for vaccum leaks (none). Once in a while I've seen the engine light come on but I cannot read it. What do you think about a bad MAP sensor? I thought that if the MAP sensor is'nt reading right the timing may not be Advanced or retarded correctely. Also what determines when the truck shifts? RPM or computer controlled?

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If I remember correctly, that vehicle may have had a knock sensor, depending on which engine. A quick drive to parts store and ask if they have one, will help you identify & confirm whether your particular engine has one. Another thing I remember is that the 5.0L with O.D. were very often carboning up inside the engine causing "Ping/Rattle" under load & even caused the transmission to shift in & out of overdrive hard & more often at those times. Had older fellow driving it and it very rarely went over 50mph, so it happened quite a bit. Would always find at least 1 or 2 plugs carboned up pretty bad, maybe the odd bad plug wire, and when replaced, pinging & hard, erratic shifting would disappear & run smooth. Just too low of RPM's when at normal driving speeds of 50 mph to clean out the carbon. Anyway, if trouble codes don't indicate knock sensor problem, or other, then I would pull the plugs & take a good look at them for carbon. If they're carbon covered, 1 or 2 or more, I'd be tempted to spray some combustion chamber cleaner into the throttle body as directed on can, and clean it out good, with old plugs still in, then replace plugs with new & see what you get.

Posted on Dec 13, 2008

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Have 86 dodge knocks if I do not run mid grade fuel

Posted on Dec 13, 2008

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