92 740 turbo 126k. When i have a few people in the back seat the car makes a wierd noise when i accelarate. I dont have an excessive load in the car, but when there are 2 people in the back or i have a full car there is this thudd sound and i can feel it as well come from the rear wheels when i accelarate. When i am up to speed it stops. Any ideas?

 

How are the engine and trans mounts?

 

I honestly dont know. Could that be it? Where would they be located?

Thanks a lot.

 

The engine mounts are on each side of the motor. The trans mount is at the back of the transmission.

It could also be a bad driveshaft carrier and bearing.

 

Under the conditions the noise occurs (low rear end of the car due to loading), it could just be the driveshaft carrier...apparently a common problem with lowered Volvos.

Replace the motor and tranny mounts first, often that stops the noise...then think about replacing or shimming the driveshaft carrier.

LINK to driveline diagnosis FAQ

 

check your universal joints. If you get a thud when you go from reverse to forward or vice versa you might have a failed universal joint on the driveshaft. If you see any indication of rust near the seals of the universal joint it has failed.

 

I have 940 turbo, 1998 model. Had the same problem that while carrying weight use to have this noise, and the moment the car use to have speed above 80 KM, there was no noise. This problem was solved by (TEC, thanks to him) replacing the gear mounting. The rubber on that mounting had gone down over the period of time, and use to touch the body while carrying load on the car, thats why the noise use to come. Ever since that is changed so now i dont have any vibration / noise in the car. Atleast ask your Mec to take that mounting out from the gear box. You can clearly make out that it is gone or still can be used. Best of luck

 

had a problem like this on my car what could it be what would it cost it only happened when i put my foot down ,so my father opened the back door i drove away what was it rear axel ,something more expensive .no exshaust rubber broken and hitting the rear when i drove of what a cheep fix if only all problems were so easy to fix .hope yours is also an easy fix good luck