Mechanics

GMC SUBURBAN ENGINE PROBLEM

1997 GMC Suburban • 108,000 miles

I hit the gas hard once and it began to knock. Oil level was low and the knocking is better but still there and I notice a loss of power and hesitaion that wasn't there before. Please help
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Guest
January 25, 2013.



The stress may have spun a connecting rod bearing. If so, the knocking will likely be picked up by the knock sensor, and in response, the Engine Computer will retard ignition timing. That would easily explain the loss of power. Your mechanic can verify that by observing the amount of timing advance being requested on a scanner that displays live data.

Caradiodoc
Jan 26, 2013.