1999 Volvo V70 Q&A

1999 Volvo V70 Question: Rough running and not enough power

My V70 drives rough but the idel is ok, the check engine light is not on. It doesn't overheat. When in PARK I press the gas pedal it makes a rough (grrrrrrr)sound. When driving it makes the rough (grrrrrr) sound and doesn't accelarte as quickly as before from stop or while on the move. I have checked the spark plugs and they are ok. The ignition coil boot had a cut and I replaced it and no change. Can you help? -
Answer 1
Check the easy things first: -spark plugs -wires -cap and rotor *if DI ignition* -blocked or failing Catalytic Converter (after driving feel the exhaust before and after the cat, as well as the cat itsself. If the cat-back is a major heat difference than in front deem the converter a fail and replace) -
Comment 1
One of the ignition coils was bad. I have changed it and have changed the spark plugs. The rough grrr is gone, but I have a different problem now. The engine shuts off after driving for 5 minutes. I guess when it heats up then it shuts off. Any ideas? -
Answer 2
Hi, I would check the codes anyway, some may be stored even if the light is off. The fuel pumps can fail on these, I would check the fuel pressure and power to the pump when it is shutting off. -
Answer 3
youg might have a bad fuel relay or your fuel pump might have abad seal or air filter might need replaced -