Engine knock after over heating. Only knocking when under load. What could it be?

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Asked by kipper33 Feb 02, 2016 at 07:34 PM about the 1993 Chevrolet C/K 2500 Silverado Extended Cab 4WD

Question type: Maintenance & Repair

Engine knock after over heating. Only knocking
when under load. What could it be?

My friend bought a truck from another friend of
mine. Long story short he sold it because he blew
a lower radiator hose and overheated and now it
knocks when under load/accelerating. It doesn't
knock if it's parked and you revv it or if it's in
neutral and you revv it. Only happens while driving.
The friend that bought it has another motor to put
in if he has to. But we want to see if we can fix this
one first. What could the problem be? Thanks in
advance.

61,265

Andrew answered 8 years ago

Or you blew up the motor. If you overheated it enough to damage the knock sensor then you defiantly ruined the engine. It would have to be on fire.

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