Question about 2002 GMC Safari

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ENGINE KNOCK 81 GMC 1500 (350)

RECENTLY CHANGED OIL. AFTER ABOUT 200 MILES STARTED TO HEAR TAPPING NOISE LIKE IT WAS LOW ON OIL ,BUT IT WAS'NT.
NOW IT'S STARTED A KNOCKING NOISE IN THE BOTTOM OF ENGINE. I HAVE'NT DRIVEN IT SINCE .CAN I FIX THIS OR WOULD IT BE BETTER TO CHANGE THE WHOLE ENGINE?

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  • Anonymous Mar 29, 2014

    cold engine knock

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IN 1981 GM MADE SOME SOFT CAMS,ALOT OF PEOPLE WERE COMPLAINING OF THIS CAM & LIFTER REPLACEMANT SOLVES THE PROMBLEM.AS FOR THE KNOCKING TAKE IT TO A PRO.

Posted on Jan 15, 2009

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You may possibly have a lifter collapsing they wear out . lifters riding on cam lobes wear out and yours are probly getting worn .new lifters if that doesnt fix the noise then you may have connecting rod bearings going or a weak oil pump. more nickels and dimes.. gl temporary fix is to reset the rockers and see how long it lasts before making noise again .sometimes the nuts loosen up and back off under constant load . (new nut) but that's only a temporary fix. prob new lifters and cam would make the most sense.

Posted on Jan 07, 2009

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Sounds like a connecting rod bearing problem. I would have a pro. listen to it.

Posted on Jan 07, 2009

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