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post #1 of 4 (permalink) Old 06-28-08, 04:47 PM Thread Starter
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97 Mustang GT

My GT when underload at about 3000RPMs knocks bad. Anyone have Ideas?

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post #2 of 4 (permalink) Old 06-30-08, 03:45 PM
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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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post #3 of 4 (permalink) Old 07-11-08, 10:57 AM
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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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post #4 of 4 (permalink) Old 09-08-08, 05:33 PM
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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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