misfires, tapping noise, camshaft position sensor | Ford Explorer Forums

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misfires, tapping noise, camshaft position sensor

Bretton65

Member
Joined
July 1, 2013
Messages
35
Reaction score
0
City, State
Minnesota
Year, Model & Trim Level
2001 Sport Trac
Hello All - I put new heads, pushrods, rocker arms and a new camshaft synchronizer on my 4.0 ohv. I am getting cylinder misfire codes and a code that the engine is running rich, and a metallic tapping sound from the engine.

I took off the valve covers and took off the rocker arms and pushrods. Nothing was damaged and everything was coated in oil. I checked compression and all pistons are within 10% of each other. I checked vacuum at idle and it held steady at 15.

Any suggestions on what to do next would be greatly appreciated. One thing I was considering was if I put the camshaft synchronizer 180 degrees off. I had the engine at TDC with the mark on the crankshaft pulley at 0 degrees and that both valves were closed so I think that I am ok. However, if it was 180 off would the engine still run and cause these symptoms?

I had the fuel injectors refurbished. Could they be causing these problems?

How about a bad/stuck lifter?

The spark plug wires and plug are new and are properly hooked up.

Thank you for your ideas!
 






Turns out the one of the new lifters was bad.

Put in the old ones back in and the noise stopped.
 






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