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I just hand my 1995 Jeep Grande Cherokee 4.0L straight 6 automatic in for tune-up (rotor, cap, wires, plugs, filters oil etc) and trans fluid service at special jeep repair shop. Also had the motor mounts and front suspension arms with bushing replaced four days after the tune up and trans service. Now after the tune-up and trans service was complete and prior to replacing the motor mounts I immediately notice more pronounced vibration in the steering wheel when stopped at a light. Take it out of gear and place in neutral while stopped at the light and it gets better but not totally gone. The replacement of the motor mounts occurred four days after the tune up and trans service with little too no effect on the this vibration. It did have a slight vibration while stopped at a light for the last few years or so prior to the tune up but now much more vibration. Jeep repair shop believes it running correctly after tune-up etc. So what is causing this increased vibration? Transmission? Want could have gone wrong in servicing the trans? Or is it more of cap, rotor, wires, plugs not agreeing with the engine - maybe try a new set of wires and plugs? Should I bring to transmission shop?

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3 Answers 3

Base on the limited information it's sounds like the tranny could be out of spec. This with new fluid would cause a pronounced vibration. Try to find out what fluids were use and if the torque converter was also serviced or replaced. As said, the new motor mounts would make matters worse as it puts more pressure on the rest of the parts. If these are poly or high performance motor mounts, it would make things feel worse. Again, if the motor feels strong and pulls as it should, I'm betting it's the torque converter. The convertor or flex plate could have lost the balancing weights that are sometimes welded on to balance them. The flex plate could also have cracked at the crankshaft hub.

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Would it help to bring to a transmission shop to listen to it run, shift it to and out of gear and feel the wheel vibration? –  Joe Lentini Apr 25 '13 at 4:48
    
Yes the engine feels strong and pulls strong. –  Joe Lentini Apr 25 '13 at 6:26
    
Yes bring it back and let them drive it with you in the passenger seat. It should already be covered by the work you paid for. –  Terrence LP Apr 25 '13 at 14:58

When you brought the Jeep in did you explain that you have a vibration? If you did and they suggested a tune-up was in order, you have a case to bring it back and complain. I donot believe it is related to the motor mount change,suspension or transmission work. The reason the vibration lessens when out of gear is beacause the load is removed. I think it is an engine problem. Are you getting a check engine light? It may be a misfire,vacum leak,sticking lifter or a miriad of other faults that occur on vehicles as they age. If you feel confident in the shop that did the tune-up bring it back and ask them to have another look.

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Thanks for the response. Vibration, though low level and present was not an issue when I dropped it off, only reason for the tune up was it was over due. Brought for minor suspension noise which I think turned out to be the front arm bushings. I has had one very slight loud value for the last 8-10 years which has not changed. The vibration in the steering wheel was prounced –  Joe Lentini Apr 25 '13 at 3:05
    
No engine check light. –  Joe Lentini Apr 25 '13 at 4:46

It's probably just the new motor mounts. If the new motor mounts are stiffer you will get more chassis vibration. I am a little surprised that shifting to neutral effects the vibration though. Is it automatic?

Did they have to drop your transmission cross member or any drive shafts during the service. If so it could be something to do with that.

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Yes automatic. No I do not think the cross member or any drive shaft needed to be touch just the trans pan dropped. Also I had the jeep after tune up and trans service for 4 day prior to motor mounts being replaced. The increase in vibration was noticed immediately upon picking up the jeep the day of the tune up and trans service was completed and prior to replacing the motors mounts. New motor mounts did not have much of an effect on this vibration. –  Joe Lentini Apr 24 '13 at 6:47

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