hey im a newb to this whole car thing and i was wondering what could be the reason why my 01 volvo s40 doesnt speed up to 15-20ish mph that fast ooo. and when i reach certain rpms and speeds my car vibrates but only when i press the gas medal about midway... if i left go of the pedal the vibrations stop.... and if i press the pedal to the medal the vibrations also stop... umm thanks for any type of help

 

[:-] I have the same problem Volvo S40 2001, have vibration on certan speeds. But I do not know why!

 

Please note that my knowledge on the S40 is very limited but I do the best until Moderator Tech or other S40 owners can reply.

First, visit a local AutoZone to see if there are any trouble codes in the engine control computer (ECU), as well as the transmission control computer (this one may have to be done at a dealer). No recalls have been issued for '01 S40 for the engine. The exhaust may be blocked, keeping from the RPM to climb, or there may be problem in the ignition system. If S40 comes with DIS (Distributorless or Direct Ignition System; each spark plug has its own secondary coil pack), the coil pack may be faulty. When was the last time the car received a good tune-up, BTW?

If all engine systems turn out fine, then the engine mounts may be starting to age. In general, rubber parts begin to get tired after 5 years.

See what others have to say. This is the best I can do at the moment, I may be able to help more if you could provide more details as to the car's conditions.

Sorry I couldn't help you better.


JPN

 

Make sure you guys dont have a bent rim, that can be a cause of accelerating vibrations issues, i just found out why my car was doing the same things, I have a bent rim and I need a alignment..

 

I too have a bent rim just from city driving.... never had the problems with rims that I've had with the Volvo.

Volvo rims = tin foil.