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Old 06-28-2008, 16:47   #1 (permalink)
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97 Mustang GT

My GT when underload at about 3000RPMs knocks bad. Anyone have Ideas?
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Old 06-30-2008, 15:45   #2 (permalink)
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Re: 97 Mustang GT

Have you tried a higher grade fuel? Have you installed new spark plugs and had the timing checked in the last 30K? Do you have any mods on the vehicle?
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Old 07-11-2008, 10:57   #3 (permalink)
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Re: 97 Mustang GT

I had a problem like that in my 93 GT befor the turbo. Had it dianosed at a shop turned out to be bad 02 sensors. Cost $259 with dionostic included $80. I was younger then now i would buy my own programer it shows trouble codes and you can pick one up fairly cheap. Just plug it in, i have one for my 93 it plugs in under the hood. ON my 07 GT i have a Diablo Sport more exspensive but worth every penny, it plugs in under the stearing wheel. I dont know where your port is but its a sound investment.
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Old 09-08-2008, 17:33   #4 (permalink)
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Re: 97 Mustang GT

i had a problem like that with my 97 gt. it would stop for a couple weeks when i cleaned my spark plugs but just come back eventually. but the real problem was my head gaskets. after changing the gaskets i haven't had the problem since
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