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1990 Mercedes Benz 190e vibration

Tiny
TAPP1777
  • MEMBER
  • 1990 MERCEDES BENZ 190E
Shakes or Wobbles problem
1990 Mercedes Benz 190e 6 cyl Two Wheel Drive Automatic 200K+ miles

When I start my car it runs smooth, but after some time (I assume when the engine heats up) the car will begin to vibrate while in drive and at an idle. If I shift the transmission into neutral (say, at a stoplight in the city), the car will begin to idle more smoothly.

I purchased the car last summer and replaced the A/C, the transmission, and brakes. It runs perfect in every other respect.

I must tell you, however, that the check engine light is on. (I assume that the O2 sensor is bad, or possibly even the AGR valve). But I am not sure if the vibration is from this problem.

Can you run a diagnostic at Autozone or Pep Boys for cheap to figure this out? (I don't want to take it to the dealership with my current income situation).

Do you know why it may be vibrating? Or can you tell me how to check my transmission mounts?

Thanks!

Jason
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Thursday, November 13th, 2008 AT 12:55 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Yes, AutoZone along with most other major auto part stores will run a FREE test to get the codes from your vehicle.

I would go run the test first and see what code is throwing the engine light, mounts wouldn't throw the code.

You may want to check the motor mounts to see if the bushings are worn. Have a helper put the vehicle in reverse (just in case the car moves a little)and give it a little fuel while holding the brake at the same time. You watch the engine and see if it moves up any.
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Thursday, November 13th, 2008 AT 1:12 PM

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