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P1310 and P0301 codes and rough idle on 97 850 T5

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

johan489
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johan489

P1310 and P0301 codes and rough idle on 97 850 T5

Post by johan489 » Wed Jan 23, 2019 12:41 pm

Please help I am stumped!
I have a -97 850 T5 with 130' miles and it throws the codes P1310 and P0301, the idle is also somewhat rough.

The codes are only thrown when the engine is cold, if do a reset when the engine is warm they do not come back.
In all other respects the engine runs good, no apparent lack of power or hesitation upon acceleration.

I have done the following with no result:
Changed spark plugs (Volvo OEM), distributor and rotor (Bosch) and Spark plug wires (Bougi).
Checked compression, 190 +- 5 PSI on all cylinders.
Changed all o-rings on fuel injectors and switched #1 and #5.

What do I do next?

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WhatAmIDoing
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Year and Model: 1998 S70 T5M
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WhatAmIDoing

Re: P1310 and P0301 codes and rough idle on 97 850 T5

Post by WhatAmIDoing » Wed Jan 23, 2019 1:18 pm

Pull all spark plugs, ground to engine, have some one crank while you check spark. Check fuel pressure at prime, idle and WOT. Try unplugging the MAF and then starting the car. Report back with findings.
'98 S70 T5M - 276,000+mi - forever a project
'99 S70 "AWD" - 220,000+mi - wrecked :cry:
Knows enough to be dangerous :wink:

johan489
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Joined: Wed Sep 25, 2013 4:42 pm
Year and Model: v70 1998
Location: United States
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johan489

Re: P1310 and P0301 codes and rough idle on 97 850 T5

Post by johan489 » Wed Jan 23, 2019 2:23 pm

WOT?

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WhatAmIDoing
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Joined: Sat Jul 30, 2016 1:13 pm
Year and Model: 1998 S70 T5M
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WhatAmIDoing

Re: P1310 and P0301 codes and rough idle on 97 850 T5

Post by WhatAmIDoing » Wed Jan 23, 2019 4:57 pm

wide open throttle
'98 S70 T5M - 276,000+mi - forever a project
'99 S70 "AWD" - 220,000+mi - wrecked :cry:
Knows enough to be dangerous :wink:

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