98 explore fuel injector tapping

[jason.k]

I bought a 98 explorer to do the swap and a few days after buying it it started making a tapping noise and check engine light was on. It was a bad camshaft synchronizer and a broke EGR valve pipe. Now the check engine light is off but have a different tapping sound. I put a stethoscope on all the fuel injectors and 2 of them is much louder than the other 6. Once the engine is warm everything quiets down.

My question is, is this a common problem with these injectors? Will rebuilding them fix the problem?

 

[needabronco]

Run a can of sea foam through the gas tank and drive it regularly until that tank is gone. It's likely just a gummed up injector.