Popping noise under load
Popping noise under load Recently I changed the plugs and wires. Under heavy load I get a popping noise under the car, think its the exhaust. Seems like its a misfire. How can I tell which cylinder it is?
Maybe you cracked a spark plug putting them in. I did that on my old 96 RS 3.8l and it didnt throw a code. I went crazy for months thinking it was my trans slipping and then i finally checked the plugs. Its worth a shot to check.
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TECH Fanatic
Joined: Aug 2006
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From: Knappa, Oregon
maybe a manifold/header gasket leak.
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Originally Posted by ghardester
When you changed the plugs did you move the AIR tubes for better access? If so, did you use new gaskets? Cause if you don't you can get a sound from a leak there.
I dont know if i cracked one or not but how can i pinpoint it?
Originally Posted by fortmyerspolice
Im going to take each sparkplug out and see whats going on
BTW would an o2 sensor do this?
BTW would an o2 sensor do this?
Originally Posted by fortmyerspolice
I dont know if i cracked one or not but how can i pinpoint it?
pull out 1 plug at a time. during this, your fingers will become dirty and greasy. Rub your fingers on the ceramic part of the plug and look for black lines on the white ceramic part. If theres a small crack it will show black because of the grease.
The popping sound could be one of the spark plugs that has backed out and letting compression get by. Make sure all the plugs are snugged, wires are pushed in fully and AIR connections are tight. Sometimes when nuts n bolts get hot then cold and hot a few times, they loosen up.
I bought 4 NGK tr55's and gapped them to .55 I replaced the drivers side and it still pops. I also saw some of the plugs i pulled had oil on the threads. I'll continue to replace the other 3 on passengers.( I replaced #8 when the popping noise was going on, so its not 8)
Just changed the plugs. Its fine now but I think one of the coil plugs was loose, I jiggled it and now it works great. For anyone having the same problem as I, Make sure all plug connections and coil connections are secure! 
