I just got a 1997 f150 and i hear a knocking sound under the hood

Asked by Feb 18, 2015 at 01:49 PM about the 1997 Ford F-150 STD 4WD LB

Question type: Maintenance & Repair

It sounds like its coming from the
motor but sometimes its sounds
like its faster than it is at other
times

2 Answers

Probably your valves ticking. They would go faster at higher RPM's and slower at low RPM's. Older vehicles will have loose valves that don't always work as well as they once did and cause a lot of noise. Since it is 1997 model it probably is about time to have a valve job done, which can be expensive, but you can keep driving for a while you just won't get the best efficiency out of your ride.

It could be your exhaust! You may have a leak at manifold

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