1996 850 - P0300 & P0302 + flashing CEL

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

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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SonicAdventure
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Year and Model: 1996 850 wagon
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Re: 1996 850 - P0300 & P0302 + flashing CEL

Post by SonicAdventure »

Thanks Erik. I am in the process of ordering a complete tune up kit from FCP: new Bosch cap and rotor, new BG plug wires and new Volvo spark plugs. The cap and rotor from my 1998 are pretty much just as bad so no reusing them.

With the old BG wires its still starting rough but idling fine now, but as soon as a load it put on it at like 35-40 MPH or up, it stumbles and fumbles. Now that I've looked at all the parts and even with no clue how old the plugs look I can see why. With this car only having 73,000 miles I would not doubt the cap and rotor currently on the car are original to the car, so its about time. The cap is really full of carbon fouling and cracking / heat distortion and it just looks old.

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greg850r
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Post by greg850r »

I've seen plug wires that idled fine but caused problems under load. I also had a bosch rotor that did the same thing. I think you're on the right track replacing them. Rotor, cap, wires, plugs will likely cure it.
05 Cross Country wagon
99 C70 Convertible
96 850R wagon
96 850T wagon
96 850 GLT 5spd N/A sedan
97 850R 5spd sedan
66 GTO 421SD 4spd
67 GTO 455 T400
02 Powerstroke 4x4
85 Yota 4x4
24' 454 Challenger
07 Softail Custom
02 Sportster Custom
Parts cars not included

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