Siwon Posted September 2, 2012 Share Posted September 2, 2012 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. Link to comment Share on other sites More sharing options...
iheartmyprelude Posted September 5, 2012 Share Posted September 5, 2012 check your distributor it might me off alittle? this is just a thought gl man Link to comment Share on other sites More sharing options...
91CrxtoV8 Posted September 10, 2012 Share Posted September 10, 2012 Any engine lights on? Link to comment Share on other sites More sharing options...
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