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Engine Popping 3000 RPM


Siwon

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99 Civic / 94 D16Z6 swap

 

What causes the engine to make slight popping noises around 3k RPM before I shift?

 

It's like a motor backfire or something.

 

It's not really loud but it's noticable from inside the car.

 

I changed the spark plugs and it helped a little (I think), but it still does it.

 

The old spark plugs had oil on the middle-top part, valve cover gasket right? I bought a new one but didn't put it on yet.

Edited by Siwon
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