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Rough idle and burning oil on rev

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

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parziv4l
Posts: 2
Joined: Sat Apr 18, 2020 12:11 pm
Year and Model: 1993 940 Turbo
Location: South Carolina

Rough idle and burning oil on rev

Post by parziv4l »

93 940 Turbo. Been having a rough idle past couple weeks, and had oil burn out exhaust coming to a near stop and speeding by a biker at 2k rpm.
No smoke coming up to 2k+ rpm at regular drive. Just changed oil today, had same thing happen, and will change filter tomorrow (needed strap wrench). Any idea what might be causing this?

FYI am amateur, dont have code reader, might need clarification diagnosing and fixing this included in your post.
lummert
Posts: 1351
Joined: Tue Jan 29, 2008 5:39 pm
Year and Model: 760 1988
Location: Portland Indiana, USA
Been thanked: 23 times

Re: Rough idle and burning oil on rev

Post by lummert »

If I recall your car has no need for a code reader. It has a diagnostics box under the hood for this purpose. Maybe do a search for 1993 Volvo 940 OBD.
1988 Volvo 760 Turbo Wagon
parziv4l
Posts: 2
Joined: Sat Apr 18, 2020 12:11 pm
Year and Model: 1993 940 Turbo
Location: South Carolina

Re: Rough idle and burning oil on rev

Post by parziv4l »

Got a A2 311 VSS signal. Also had issues with surging idle, coming up to 1500 rpm at times after putting in park. Should I look to replace the VSS? Everything but my speedometer works (fuel gauge, barely).
lummert
Posts: 1351
Joined: Tue Jan 29, 2008 5:39 pm
Year and Model: 760 1988
Location: Portland Indiana, USA
Been thanked: 23 times

Re: Rough idle and burning oil on rev

Post by lummert »

1988 Volvo 760 Turbo Wagon
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