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1999 Pontiac Montana Knocking noise that disappears

Tiny
JOSH13205
  • MEMBER
  • 1999 PONTIAC MONTANA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 181,000 MILES
I have just bought the van and was told it has a knock. It had a brand new Jasper motor put in it 60000 miles ago. It is out of the Jasper warranty. It had set for about 4 months. It only knocks for about 30 seconds and then disappears. It sounds like it is from the top of the motor. Could it be the lifters or rockers? Or perhaps something with the spark?
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Saturday, March 20th, 2010 AT 2:28 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
The rockers will make more of a ticking noise. It may be cam bearings. Unlike water, steel expands when it gets hot. Thus, if there is excessive play in a bearing, it sometimes will go away as the engine gets hot.
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Sunday, April 25th, 2010 AT 12:44 AM

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