2003 V40

Ragman · Post by **Ragman** » 18 Jun 2008, 20:35

Just checked a friend's V40 for codes and got the 301 to 304 list for cylinder miss-fire. The car has about 105000km on it and apparently it had recently been at the dealer for this issue and plugs were replaced. I don't believe this thing has cap and rotor due to the coil pack system so I'm ruling that out but maybe the plugs are incorrect or the wrong grade of fuel was used. Any other suggestions would be appreciated.

Post by **MadeInJapan** » 18 Jun 2008, 20:54

Make sure plugs are gapped correctly (specs are in the owner's manual)...the car could need a new power pack before the plugs...not that uncommon.

DrJ · Post by **DrJ** » 23 Jul 2008, 05:18

Not sure if this relates to the thread, but I just got this car and it was running rough in the morning and 'missing' when idling. Got the spark plugs replaced and that solved the rough running, but it still occasionally misses while I'm, say, waiting at a light. Doesn't happen always, but enough that I notice it and wonder. Thoughts?