I Need Help! I have a 2000 v70 xc and I was stopped at a stoplight and when i accelerated i heard a grinding noise, very similar to that of a manual transmission when you miss a gear (my car is an automatic). Now when the car is in any gear it is very loud and has very little power when accelerating. When i do get going to about 40 or 50 mph the noise seems to quiet a little. my step dad who has been a mechanic his whole life thinks it may be a motor mount but her said it wouldn't vibrate in BOTH drive and reverse like it does. I had an 1988 740 with what was thought to be a bad catalytic converter that had similar problems but would not accelerate hardly at all when it reached about 40 mph which made me think it may be the turbo so i dont know. what could it be?! any help woulf be GREATLY APPRECIATED!!!!

 

Intercooler hose or something leaking?

 

there is nothing leaking, i checked everywhere. it sounds like it is coming from behind the engine.

 

Maybe your turbo (if you have one) has seized. This would create an intake and exhaust restriction, reducing power.