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
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98 S70 Strange Transmission issues Topic is solved
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- Posts: 154
- Joined: Sun Mar 24, 2019 3:25 pm
- Year and Model: 1998 v70 N/A
- Location: Ontario
- Has thanked: 19 times
- Been thanked: 18 times
Re: 98 S70 Strange Transmission issues
1998 S70 N/A Auto (Parts car)
1998 V70 N/A Auto New Daily
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar
)
1999 S70 T5 Auto(Project)
2000 S70 SE M Learning platform
1998 V70 N/A Auto New Daily
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar

1999 S70 T5 Auto(Project)
2000 S70 SE M Learning platform
- misha
- Posts: 4577
- Joined: Sun Dec 07, 2008 4:09 pm
- Year and Model: '97 850 2.5 20v
- Location: Serbia
- Has thanked: 67 times
- Been thanked: 176 times
Re: 98 S70 Strange Transmission issues
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
'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
-
- Posts: 154
- Joined: Sun Mar 24, 2019 3:25 pm
- Year and Model: 1998 v70 N/A
- Location: Ontario
- Has thanked: 19 times
- Been thanked: 18 times
Re: 98 S70 Strange Transmission issues
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 New Daily
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar
)
1999 S70 T5 Auto(Project)
2000 S70 SE M Learning platform
1998 V70 N/A Auto New Daily
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar

1999 S70 T5 Auto(Project)
2000 S70 SE M Learning platform
- misha
- Posts: 4577
- Joined: Sun Dec 07, 2008 4:09 pm
- Year and Model: '97 850 2.5 20v
- Location: Serbia
- Has thanked: 67 times
- Been thanked: 176 times
Re: 98 S70 Strange Transmission issues
Could be that coil replacement wasn't needed since spark plugs were that worn.
Happy Volvo miles!
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
'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
-
- Posts: 154
- Joined: Sun Mar 24, 2019 3:25 pm
- Year and Model: 1998 v70 N/A
- Location: Ontario
- Has thanked: 19 times
- Been thanked: 18 times
Re: 98 S70 Strange Transmission issues
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

Thanks!
1998 S70 N/A Auto (Parts car)
1998 V70 N/A Auto New Daily
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar
)
1999 S70 T5 Auto(Project)
2000 S70 SE M Learning platform
1998 V70 N/A Auto New Daily
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar

1999 S70 T5 Auto(Project)
2000 S70 SE M Learning platform
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