Hello bricksters,
Of late my brick seems to be shaking like the blazes at idle. Cold or warm start, doesn't matter. At first, after start, there is nothing everything is calm. Then slowly but surely the shake increases. There is no shake when the car is in motion though. I opened the hood and got scared. The engines seems to want to walk out of its compartment. A search on brickboard led me to some similar posts for the 200/700 where advice was given to check the vacuum hoses. Is that the way to start ?

Thanks
Naveen
92 940T@130.1K 00 9-3SE@50.5K

If everything else checks out good...the rubber alternator/AC mounts will also fail over time, creating a suprising amount of shake.

Agree, they are called "accessory bushings" and sold by FCP Groton in rubber or urethane. I just replaced the alternator bushing on my 940 with 136k... did lower idle noise a bit, but suspect biggest advantage is less wear on alternator pulley shaft/bearings/bushings.

my .02

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!