hi
im new to all this my problem is my volvo v40 t4 wen started from cold car runs fine but few miles down road wen warm it starts to run rough,miss even to stageof completely dying on me and sounds as though running on three cylinder .wen left to cool it will start and run fine again till warm.please help

 

Check engine light on?

 

no tech

 

new turbo fitted,fuel filter pcv cleaned,,ive been told change coils..only dies wen engine heats and wen left to cool fine again.wen it dies it wont start till cool.also do 1-8 or2.0 coils fit the t4 1.9

 

Not sure if the coils fit or not we only have the 1.9 in the U.S.
Maybe a speed sensor or something. Like that is bad.
Have you been able to pinpoint what you loose when it dies?
Do you still have spark?
Do you still have fuel?
Do you still have injector pulse?

 

I dunno if that helps I've seen an odd S40 (2001) the car do similar thing no check engine light engine temp gauge work normally but when u read out from VIDA (dealer specific computer) u will see the engine temp jump up and downand fluctuate. after I replace engine temp sensor the car ran fine and never came back for the problem. I hope that helps