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1997 Volvo 850 Having Trouble Starting, O2 sensor?

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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1997 Volvo 850 Having Trouble Starting, O2 sensor?

Post by Hale » Fri Sep 29, 2017 8:52 am

My 1997 Volvo 850 Turbo has been having some difficulty starting these past few days.
I bought it about a month ago, replaced the alternator, getting the feeling that this car has been neglected...
Knew it felt weird starting it one day, noticed that it took an extra moment to start up... Then later wouldn't really start at all. After trying again it seemed to start fine. I just still feel this moment of hesitation.
Check engine light came on and my diagnostics told me it was the O2 sensor. Could this possible lack of oxygen reaching the engine be creating my startup problem?

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Re: 1997 Volvo 850 Having Trouble Starting, O2 sensor?

Post by erikv11 » Fri Sep 29, 2017 9:24 am

Usually if the O2 sensor goes bad, you get a code but the car runs fine.

On the other hand, if there is a small vacuum leak somewhere, the car will run a little rough (basically proportional to the size of the leak), and it *may* set an O2 sensor code.

I would check all of the rubber vacuum lines for cracks and crumbles and breaks. Especially the one to the fuel plus dampener on the fuel rail. Unfortunately many of these may be failing because they are 20 years old. I would start by replacing them.

As for the starting problem, I would check into the ECT sensor.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 285k
'06 S60 R, 165k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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Re: 1997 Volvo 850 Having Trouble Starting, O2 sensor?

Post by rspi » Sun Oct 01, 2017 9:02 pm

'95 855 T-5R M, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red 25/32 mpg
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos

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