have a 2002 s40 turbo
automatic 1.9 litre engine

car runs fine ..but when coming onto highway and you have to speed up to flow withe traffic..the car is surging,,it seems likes it choking...
- thinking maybe change the transmission fluid
car has 70,000 kms..
input really appreciated

 

hmmm.....plugs or coils maybe?...does it happen when you use the turbo ?

 

Check the spark plugs and coils.

 

thanks for replys
- changed the spark plugs couple of months ago
coils...sorry but what is coils
thanks

 

There is 2 coils that feeds the spark plugs power. They are mounted over I believe cylinder 1 and 2.

Also just because you did the Plugs a couple of months ago doesn't mean they are all good.

What brand did you put in?

 

hi thanks
put in bosch double platinum
thanks

 

You might want to reconsider running non Volvo plugs. Other members have had problems with them in the past. There are some parts on Volvo's where its best to keep Volvo parts.

 

well my mechanic fiend i mentioned about maybe we now go install volvo sparkplugs....and we had a debate as he said DOES VOLVO MAKE SPARKPLUGS ? as he feels the other he installed were just find
opions
thanks

 

The bosch Regular Platinums are what comes factory in the S40.

 

I am having the same problem with my wife's car. The plugs and coils were checked an found to be okay. One difference, when the turbo hits boosts, it's making a whistling sound. Is this a sign that it's bad?

 

My wifes 04 with 58,000 is doing the same thing.....I can't see the Tach move when it happens. It also happens when holding the gas pedal down a bit to carry a hill. It's noticeable enough that everyone in the car actually moves when it happens.