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need help diagnosing engine damage

CountryBoy

CountryBoy

New member
okay so my car is running rough and the boost gauge on my car is bouncing around 15"-20" of vacuum,the car is popping and banging like its running too rich and the car is shaking really bad at an idle. I already changed all the spark plugs and all the ignition coils. I'm thinking bad piston rings or chipped piston and or pistons. suggestions?? i know the pulley on the supercharger is a 3.4 instead of a 3.8 like it should be and i know i ran the car kinda hard so i know that its my own fault for not doing research before i got the car.
 


Did any of the plugs look funny like the ends missing or anything? If you need a motor I'll have one soon I'm going to part out my gtp.
 
i already replaced all the plugs and ignition coils,it could be the IGN but i doubt it with the way its running,ds 2 of the plugs had the ends busted off them but the other 4 were in tact but very wet with gas/oil.
 


With 2 broken plugs I'd be looking for a longblock, but that's just my .02. Do the comp. test and that will tell you for sure. Sounds like a chipped piston(s). The only other time I've seen a boost gauge bounce around was when there was a broken valve spring.
 


I'm not sure if it would or not,but i put a scan tool on the car and it's throwing a code for cylinder 1 misfiring. so I dont really know what the deal is because neither of the busted plugs came out of cylinder 1
 
on the cylinders with the bum plugs, the valves might be bent if peices of metal are flying through your engine,

like others said do a comp test
 


its a 1997 gtp 2 door,i replaced all the plugs and coils,i have all new wires for it,i scanned the car and the code is for a cylinder one misfire. compression test in my next step i think
 
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