General '08 S40 2.0D Hesitating/juddering around 3000 RPM

[lisa purdy]

Hi, recently purchased '08 S40 2.0D, which seemed fine; then the 'engine system service req'd' message appeared and the car went into limp mode. A visit to Volvo dealerwas fruitless, they could find no error code. This happened several times, got the message, car limped home, would be fine after turning off and restart. Dealer changed fuel filter to no effect. Since then, the error message no longer appears but another problem has become evident; driving uphill in particular, dropping the car into second gear, the engine started noticeable judder or hesitation whilst accelerating at around 2800-3000 revs, same in third. The car is not kangarooing violently but the power is not be applied smoothly - as though you're lightly feathering the gas pedal is the best way I can describe - so it sounds and feels like the power is off/on off/on etc.. There's also a kind of 'shushing' sound accompanying the gain/loss of power. Back to dealer, again, they replaced the diesel pump (unheard of, so I hear) which they said had a hairline fracture - BUT this still hasn't solved the problem: any suggestions/clues gratefully received. Thanks in advance, Lisa

[s40_kid]

hi lisa from what you've described it sounds to me like the egr valve may be at fault. I had the same issue recently where the car would not rev over 3000 rpm and was jerky under acceleration. i had removed the egr pipe to check for gunk and thjing the valve may of stayed open when i replaced the egr pipe. When i started the car for the first time after the work i received the service message and the car drove as you described. I must of been lucky as it disappeared afer i restartede the car and has not returned since fingers crossed. If its an 08 then its still under volvo warranty. return it to them and dont accept it back units sorted

Good luck