Loud thump when idling

06LS2GTO

MEMBER
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?

Wednesday, January 4th, 2012 AT 11:28 PM

3 Replies

FACTORYJACK

MECHANIC
4,159 POSTS

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?

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Thursday, January 5th, 2012 AT 12:04 AM

06LS2GTO

MEMBER
11 POSTS

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

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Thursday, January 5th, 2012 AT 12:20 AM

FACTORYJACK