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98 S70 Strange Transmission issues Topic is solved

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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yanga001
Posts: 42
Joined: Sun Mar 24, 2019 3:25 pm
Year and Model: 1998 v70 N/A
Location: Ontario
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yanga001

Re: 98 S70 Strange Transmission issues

Post by yanga001 » Thu May 21, 2020 1:42 pm

Ill take a picture of the ECU's on the weekend and post it, maybe i read the words wrong on it?

Edit:
My bad i was confused with the labeling of the ECU's as they said j4.2 and j7.2 if i recall correctly. Will upload pictures later
1998 S70 N/A Auto (Parts car)
1998 V70 N/A Auto
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project)
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misha
Posts: 4394
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
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misha

Re: 98 S70 Strange Transmission issues

Post by misha » Thu May 21, 2020 1:49 pm

Don't bother...it can ONLY be M4.4 in '97 & '98 non-turbo B5254S.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
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yanga001
Posts: 42
Joined: Sun Mar 24, 2019 3:25 pm
Year and Model: 1998 v70 N/A
Location: Ontario
Has thanked: 12 times
Been thanked: 5 times
Canada
yanga001

Re: 98 S70 Strange Transmission issues

Post by yanga001 » Sat May 23, 2020 7:55 pm

The running issue was fixed with a new set of sparkplugs and a used ignition coil. The plugs were worn out completely which resulted in rough running and some smoke. Now the car runs smoothly and happily. Time to tackle the locked brakes on the 99'
1998 S70 N/A Auto (Parts car)
1998 V70 N/A Auto
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project)
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User avatar
misha
Posts: 4394
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 57 times
Been thanked: 144 times
Serbia
misha

Re: 98 S70 Strange Transmission issues

Post by misha » Sun May 24, 2020 5:19 am

Could be that coil replacement wasn't needed since spark plugs were that worn.

Happy Volvo miles! ;)
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
Top
yanga001
Posts: 42
Joined: Sun Mar 24, 2019 3:25 pm
Year and Model: 1998 v70 N/A
Location: Ontario
Has thanked: 12 times
Been thanked: 5 times
Canada
yanga001

Re: 98 S70 Strange Transmission issues

Post by yanga001 » Sun May 24, 2020 7:16 am

misha wrote: ↑
Sun May 24, 2020 5:19 am
 Could be that coil replacement wasn't needed since spark plugs were that worn.

Happy Volvo miles! ;)
We tested with just new plugs and it was really rough, put in the used coil and it returned to normal. I have a feeling that it was not serviced in a good number of kilometers as the plugs were just gone :lol: .

Thanks!
1998 S70 N/A Auto (Parts car)
1998 V70 N/A Auto
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project)
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