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850 Turbo P1310, P0300, P0304,5- Parts replaced now what?

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
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tlh
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850 Turbo P1310, P0300, P0304,5- Parts replaced now what?

Post by tlh » Sat Nov 09, 2019 2:51 pm

Recently bought a 1996 Volvo 850 Turbo for my daughter with 160k miles. The trip home was 500 miles of interstate with no hard acceleration and it ran perfectly. My daughter, showing off to a friend, put it in sport mode and floored it, after accelerating it wouldn't maintain idle. It will re-start, run and accelerate fine but will stall at idle.

Check engine light came on after a few more miles. Generated 4 codes, P1310, P0300, P0304, P0305. We replaced the distributor cap and rotor with generic O'Reilly's part, replaced wires with Bougicord (sp), and champion spark plugs. Check engine light went out and it ran and idled great. Tried accelerating hard again and the same thing happened again with the same codes generated.

Is it possible that a bad coil could generate only codes on 2 of the 5 cylinders? Or that it would only show up after hard acceleration?



tlh
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Re: 850 Turbo P1310, P0300, P0304,5- Parts replaced now what?

Post by tlh » Sat Nov 09, 2019 5:08 pm

Replaced the coil with no change in symptoms. Now what?



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jreed
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Re: 850 Turbo P1310, P0300, P0304,5- Parts replaced now what?

Post by jreed » Sun Nov 10, 2019 7:17 am

It might be worth trying different spark plugs and retesting. On my '97 855 GLT (light pressure turbo) I use the Bosch copper FR7DC+ (model 7955) gapped to 0.7-0.8mm.


1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

tlh
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Re: 850 Turbo P1310, P0300, P0304,5- Parts replaced now what?

Post by tlh » Sun Nov 10, 2019 6:11 pm

I stated incorrectly that we had used Champion spark plugs, I checked the FCP Euro invoice this morning and we actually used the Bosch 7955 plugs. I re-checked the gap which had no effect.

Since the symptoms came about only after hard acceleration, I started wondering whether a partially clogged pcv system is putting pressure on the seal behind the distributor and rotor and leaking oil only at high turbo boost. Does high turbo boost equal higher pressure in the crankcase? Once the weather warms up, we will pull the distributor and rotor off to see if we have oil and or moisture in there.



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Re: 850 Turbo P1310, P0300, P0304,5- Parts replaced now what?

Post by abscate » Sun Nov 10, 2019 7:19 pm

High boost will increase the pressure, yes. Good plan to check under the distributor cap


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