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Shake at idle 900 1992

posted by  Aye Roll on  Mon Jan 3 17:59 CST 2005
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last visit: Tue Oct 14 21:08 CST 2014
[RELATED]

Idle vibration plagues all the 7 & 9 cars. The wagons are more affected because they really resonate.

Certainly any vacuum leaks cause rough idling, as well as any problem with ignition parts: plugs, cap, rotor, wires. A break in the exhaust or failed exhaust hanger can be responsible as well.

But the problem may not go away entirely if the engine mounts are bad. There's a big rubber block mount at the back of the transmission; the last one I changed, in an 88 745, transformed a car from freight train to limousine noise levels. The front engine mounts are hydraulic, and are intended to damp out engine shakes. They're more pricy, about $100 each for "real" ones or $50 for non-Volvo brands, but make a huge difference in smoothness.
See what a shop will charge you- it's not that tough of a job to replace all of the mounts. Maybe a bit more work for the right side one on a Turbo.
--
Rob Bareiss, New London CT ::: Roterande Fläkt Och Drivremmar!






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