MY 850's vibration from under the hood has been getting worse and worse. Its worst when the motor is cold. The vibration is coming from teh timing belt area or at least that side of the motor. It's quite loud. this happens at low rms and goes away at higher rpms in park or drive. Could this be a cv joint out on the passenger side? Also the car has developed a hesitation when you tap the gas, bogging. That gets better as the motor warms up as well. Not sure if it's related or two separate issues. it's also stalled a few times over the past few months as well for a little background. Any ideas? Could it be a motor or tranny mount thats' toast? Fuel pump going bad causing the hesistation, stalling and bogging?

thanks I really need some direction as it's a daily driver and I drive my kids in this thing as well.

Cheers

 

Hello,

I had a similar problem with my new old 850 after buying, car rpm would drop and surge at idle when warming the car up causing a bad vibration, and there was a loss of power after stopping at a light. My pnp switch was also faulty at that time. I got the codes and it gave me the ones for the pnp switch, turbo control valve, and some misfiring cylinders. One new pnp switch, a used turbo control valve, some vacuum hose repairing later, car running like a top.

I think your problem might be solved with a tune up, but i'd suggest trying to get the codes pulled first.

Cheers,

CN