98 v70xc OBD2 No Power/ Rough engine idle

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

Post Reply
Bdates
Posts: 33
Joined: Tue Feb 25, 2014 3:18 pm
Year and Model: 1998 V70XC AWD
Location: Virginia, New Jersey, New Mexico

98 v70xc OBD2 No Power/ Rough engine idle

Post by Bdates »

OK...

So I can't properly diagnose my random rough engine bogging because my OBD2 port seems to be powerless. My Scantool isn't reading, or even turning on. Its not the tool because it used to work on my old 98's in the past and olaso used to work with this car. It still works on my wife's 08 Escape. I couldn't find anything info about a fuse, except that it may be connected to the cigarette lighter. Both cigarette lighters have power (only if I turn my charger at the perfect angle).

As for the random rough idle... I have cleaned the MAF sensor with spray, I have cleaned the AIC valve with throttle body cleaner, I changed spark plugs, I checked fuel pressure (seems to be fine, needle was vibrating between 30-40psi, however it was a harbor freight kit) so that means it can't be the fuel pump or fuel filter. I changed the Air Filter. I didn't see any hoses disconnected anywhere. I took the fuel rain off and check out the fuel injectors, they seem fine, no noticeable clogging.

I'm thinking maybe I will have to replace the injectors, but trying not to throw money at it until something works.

I want to check the code so badly for a pointers! So frustrating. Did I mention I have 4 12-hour trips coming up in a month?
2000 s40 (Sold)
1998 v70xc (Deceased)
1991 Mercury Capri XR2 (Sold)
2001 Mazda 626 ES (Wife's old and Sold)
1998 v70 AWD (Sold)
1998 v70xc (Daily)
2005 Polaris Predator 500 (Sold)
2007 Kawasaki Prairie 700 (Sold)
2008 Ford Escape Hybrid (Wife's)
2007 Yamaha vStar 650 Custom (Sold)
2006 Kawasaki Z1000 (Sold)
2016 Yamaha FZ-09 (Toy)
2015 Honda CB300F (Wife's Toy)

User avatar
abscate
MVS Moderator
Posts: 24113
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 458 times
Been thanked: 1363 times

Post by abscate »

Cheap things to try

Open up the distributor cap and rotor and let's see pictures of inside

Swap coil for known to be good

Jumper the fuel pump relay with a wire ( your fuel pressurediagnostic does lead away from this, agreed, well done)

Is your battery voltage strong, 12.4 volts or better?
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

Bdates
Posts: 33
Joined: Tue Feb 25, 2014 3:18 pm
Year and Model: 1998 V70XC AWD
Location: Virginia, New Jersey, New Mexico

Post by Bdates »

I already jumped the fuel pump relay, and tried an old one I had sitting around.
Haven't tried the distributor cap and rotor yet...
Battery is good, I think 12.2 volts but I will check again.

Update from just driving it into town for about 20 mins...
It definitely seems to be worse when cold. The car seems to die when in gear easier when a load is put on it without the accelerator. For instance, when simply shifting into reverse or when coming to a stop while in drive. When accelerating and cold out, I'd say about 60-70 percent of the time the car has minimal power instantly, then jumps up as if I only then pressed down on the accelerator. The car will jump and die in power with minimal accelerator pressure, but if I stomp it it will jump once or twice, then work as it should till about 4k rpm.
2000 s40 (Sold)
1998 v70xc (Deceased)
1991 Mercury Capri XR2 (Sold)
2001 Mazda 626 ES (Wife's old and Sold)
1998 v70 AWD (Sold)
1998 v70xc (Daily)
2005 Polaris Predator 500 (Sold)
2007 Kawasaki Prairie 700 (Sold)
2008 Ford Escape Hybrid (Wife's)
2007 Yamaha vStar 650 Custom (Sold)
2006 Kawasaki Z1000 (Sold)
2016 Yamaha FZ-09 (Toy)
2015 Honda CB300F (Wife's Toy)

User avatar
abscate
MVS Moderator
Posts: 24113
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 458 times
Been thanked: 1363 times

Post by abscate »

I missed this earlier.
, I checked fuel pressure (seems to be fine, needle was vibrating between 30-40psi, however it was a harbor freight kit) so that means it can't be the fuel pump or fuel filter
Vibrating fuel pressure isn't good. Relay , wiring, pump and fuel pressurecregulator (FPR) need evaluation
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

Bdates
Posts: 33
Joined: Tue Feb 25, 2014 3:18 pm
Year and Model: 1998 V70XC AWD
Location: Virginia, New Jersey, New Mexico

Post by Bdates »

For a 98 v70 xc the fuel pressure regulator is behind the passenger front wheel?
2000 s40 (Sold)
1998 v70xc (Deceased)
1991 Mercury Capri XR2 (Sold)
2001 Mazda 626 ES (Wife's old and Sold)
1998 v70 AWD (Sold)
1998 v70xc (Daily)
2005 Polaris Predator 500 (Sold)
2007 Kawasaki Prairie 700 (Sold)
2008 Ford Escape Hybrid (Wife's)
2007 Yamaha vStar 650 Custom (Sold)
2006 Kawasaki Z1000 (Sold)
2016 Yamaha FZ-09 (Toy)
2015 Honda CB300F (Wife's Toy)

Bdates
Posts: 33
Joined: Tue Feb 25, 2014 3:18 pm
Year and Model: 1998 V70XC AWD
Location: Virginia, New Jersey, New Mexico

Post by Bdates »

Here are the old cap and rotor and the newer but used cap and rotor...
abscate wrote: Sun Jan 20, 2019 1:29 am Open up the distributor cap and rotor and let's see pictures of inside
Here are the old cap and rotor pics and the newer but used one i installed with newer used wires.
Attachments
new cap.jpg
new rotor.jpg
new rotor.jpg (59.83 KiB) Viewed 257 times
Cap.jpg
rotor.jpg
2000 s40 (Sold)
1998 v70xc (Deceased)
1991 Mercury Capri XR2 (Sold)
2001 Mazda 626 ES (Wife's old and Sold)
1998 v70 AWD (Sold)
1998 v70xc (Daily)
2005 Polaris Predator 500 (Sold)
2007 Kawasaki Prairie 700 (Sold)
2008 Ford Escape Hybrid (Wife's)
2007 Yamaha vStar 650 Custom (Sold)
2006 Kawasaki Z1000 (Sold)
2016 Yamaha FZ-09 (Toy)
2015 Honda CB300F (Wife's Toy)

Bdates
Posts: 33
Joined: Tue Feb 25, 2014 3:18 pm
Year and Model: 1998 V70XC AWD
Location: Virginia, New Jersey, New Mexico

Post by Bdates »

First two pics are the newer ones I installed.
2000 s40 (Sold)
1998 v70xc (Deceased)
1991 Mercury Capri XR2 (Sold)
2001 Mazda 626 ES (Wife's old and Sold)
1998 v70 AWD (Sold)
1998 v70xc (Daily)
2005 Polaris Predator 500 (Sold)
2007 Kawasaki Prairie 700 (Sold)
2008 Ford Escape Hybrid (Wife's)
2007 Yamaha vStar 650 Custom (Sold)
2006 Kawasaki Z1000 (Sold)
2016 Yamaha FZ-09 (Toy)
2015 Honda CB300F (Wife's Toy)

User avatar
WhatAmIDoing
Posts: 761
Joined: Sat Jul 30, 2016 1:13 pm
Year and Model: 1998 S70 T5M
Location: North America
Has thanked: 66 times
Been thanked: 57 times

Post by WhatAmIDoing »

Other than being dirty, they look operable. Wouldn't hurt to clean them up a little.
'98 S70 T5M - 282,000+mi - forever a project
'99 S70 "AWD" - 220,000+mi - part out :cry:
Knows enough to be dangerous :wink:

Post Reply
  • Similar Topics
    Replies
    Views
    Last post