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OBDII Code P0304

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
This topic is in the MVS Volvo Repair Database » Fuel Tank Recall Notice
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iceb52!
Posts: 16
Joined: 29 January 2005
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OBDII Code P0304

Post by iceb52! »

I have a 2000 V70 with 136000 miles. Car started running rough yesterday. OBDII code is P0304 (Cylinder 4 Misfire Detected). What could be the problem?

Injector, sparkplug, ????

Thanks
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Jot
Posts: 593
Joined: 24 January 2005
Year and Model: C30 2010
Location: Orr's Island, Maine

Post by Jot »

Either the plug or coil pack for cylinder four has a problem. Clear the codes and see if it returns.
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Nrracing

Post by Nrracing »

Most likely the Coil Pack (quite common with High Milage). You can get news one at Autozone for less than $40.
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iceb52!
Posts: 16
Joined: 29 January 2005
Year and Model:
Location:

Post by iceb52! »

Thanks for the help. The piece of metal on the plug that bends over the electrode was broken off. It was a Volvo plug installed by the dealer about 10,000 miles ago. I replaced it myself and the car is running great now. I showed the plug to the dealer and he just shrugged and said "bad plug." Anyway, thanks again.
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