There's a pressure relief valve on the bottom of your air dryer, located drivers side engine compartment. With the motor running, stick your hand under it to see if it's stuck partially open. If so you can tap on it with a wrench or small hammer to see if it closes. If it's oily it probably means that your compressor is going bad.
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
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