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Jeremy
Jeremy, Certified Diesel Technician/Electrician
Category: Ford
Satisfied Customers: 3382
Experience:  ASE, NATEF Engines and Electrical certified, EPA 608/609
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My 2002 f150 has loud knock when starting then goes to a

Customer Question

My 2002 f150 has loud knock when starting then goes to a quiet knock.
Submitted: 2 years ago.
Category: Ford
Expert:  Jeremy replied 2 years ago.

My name is ***** ***** I will assist you.

From what you seem to be describing may be a valve on the engine.

When the spring goes bad or is broken on the valve, it will have a loud knocking sound that goes to a quite tapping sound once the engine oil is warm and can get into the spring on the valve.

The best way to determine this issue is to remove the valve cover off both side of the engine and inspect the valves. If it is a spring, the spring can be replaced without removing the head. If it is the valve, the head need to come off and the valve replaced.

Don't drive the vehicle too much for the issue will get worse and you could cause the valve to drop into the cylinder and wipe out the engine.

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Jeremy