[Rick Norwood]

I decided to start my own thread on this issue rather than hose up someone else's thread.

2000 GMC Jimmy 4.3. 61,000 miles. Just started with a loud lifter knock over the weekend. Oil and coolant change less than 1000 miles ago. I checked the under side of the oil filler cap and saw what I thought was a lot of moisture. The oil does not appear to muddy. However it does appear to be slightly more full than I remember filling it at the last oil change. The coolant in the plastic reservoir tank is also a little lower, but that could be from working the air out of the system from the last flush.

I immediately started to suspect the intake manifold gasket. Does anyone have a service bulletin number on this? Is there a good test to prove if it is the Intake Manifold gasket or not?

I'm still under an extended warranty and I don't want a run around at the Stealership when I take it in. I'm sure they're going to tell me something like I need an Oil additive to quiet the lifters or Aluma-seal for the Radiator.

Any Help or similar experiences would be greatly appreciated.