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98 S70 Strange Transmission issues Topic is solved

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 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: 787
Joined: 24 March 2019
Year and Model: 98/99/00 v/s70’s
Location: Ontario
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Re: 98 S70 Strange Transmission issues

Post by yanga001 »

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)(planned to be harvested)
1998 V70 N/A Auto New full restoration project (Water pump thrown at 404K Km)
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project) (planned to be fixed)
2000 S70 SE M Learning platform (planned to be driven one day)
2008 S60 2.5T Auto (Sold)
2012 Honda Pilot AWD Touring (Daily)
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misha
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Year and Model: '97 850 2.5 20v
Location: Serbia
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Post by misha »

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
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: 787
Joined: 24 March 2019
Year and Model: 98/99/00 v/s70’s
Location: Ontario
Has thanked: 59 times
Been thanked: 110 times

Post by yanga001 »

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)(planned to be harvested)
1998 V70 N/A Auto New full restoration project (Water pump thrown at 404K Km)
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project) (planned to be fixed)
2000 S70 SE M Learning platform (planned to be driven one day)
2008 S60 2.5T Auto (Sold)
2012 Honda Pilot AWD Touring (Daily)
Top
User avatar
misha
Posts: 5379
Joined: 7 December 2008
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 152 times
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Post by misha »

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
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: 787
Joined: 24 March 2019
Year and Model: 98/99/00 v/s70’s
Location: Ontario
Has thanked: 59 times
Been thanked: 110 times

Post by yanga001 »

misha wrote: ↑24 May 2020, 05:19 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)(planned to be harvested)
1998 V70 N/A Auto New full restoration project (Water pump thrown at 404K Km)
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project) (planned to be fixed)
2000 S70 SE M Learning platform (planned to be driven one day)
2008 S60 2.5T Auto (Sold)
2012 Honda Pilot AWD Touring (Daily)
Top
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