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if it happens only when its in gear and not while in park, it sounds like a transmission problem

AnswerThanx for the feedback. I does it if it is in park too. It just seems like it has to get a little warmed up or something for it to do that. It gets faster and louder with th RPMs, not speed or gear. AnswerSome engines need higher octane in the fuel than others. 85 octane fuel is regular gasoline at most places. Try using a higer octane fuel for a while. AnswerCheck your main belt.
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2011-09-13 17:53:33
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Q: What would cause a loud clicking noise from the bottom of the engine in a 1988 Chevy Suburban after it drives it over 30 MPH that persists if you are moving or not and gets louder the higher the RPMs?
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