Mechanics

LOUD THUMP WHEN IDLING

2006 Pontiac GTO • 74,000 miles

Recently head gasket blew and had water in the cylinders, it may have gotten compressed.


Could it be the connecting rods?
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06ls2gto
January 4, 2012.



Unless there was a considerable amount of water in a cylinder, the rod should not have been bent enough to be making a noise. If it had, it wouldn't make noise for long, before the engine ate it's lunch. Is this a thump, or a knock? I consider a thump a low tone noise, in contrast to a knock which is higher in pitch. This only occurs at idle? Another characteristic if it were a rod, would probably be an increase in the noise as the centrifugal mass was emphasized, like an increase in engine speed. Was there intermix of coolant and oil during this head gasket problem, what was the symptom?

Factoryjack
Jan 5, 2012.
Yes coolant and water got in the oil and yea its a thump low tone sound at first it was a ting from the valve train then the gasket blew and when that happened it made a very loud ting sound after it blew. Thats been fixed but now it has a low tone thump

Tiny
06ls2gto
Jan 5, 2012.
Replied to your other post.

Factoryjack
Jan 5, 2012.