Montana Vibration?

2 messages, Last post on Aug 02, 2008 at 1:07 PM

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What is this discussion about? Pontiac Montana, Pontiac Montana SV6, Van

#1 of 2 Montana Vibration? by ruthl Aug 01, 2008 (1:29 pm)
HI I wondered if anyone could tell me what this is. We just had intake gasket changed. Got the van home and it has started to vibrate really bad but it isn't all the time. You can drive forty or fifty miles with nothing, or else it can happen. Feels like it's falling apart. Any suggestions as to what this can be ?
#2 of 2 1999 Pontaic Montana Idle Vibration by critter2008 Aug 02, 2008 (1:07 pm)
We'ra having a bad idle vibration. The vehicle drives fine off idle - no skips or misses. Idle rpm seems to be a little high at 850 - 900 in Drive. Watching the motor run shows no vibration and can't 'feel' anything weird. Mounts look tight. Maybe a PCV valve, Oxy sensor, or damper? No engine warning light. Any ideas?