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Issue with 96 850R Starting Not Turning Over 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
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wackenhut
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Joined: Tue Jul 07, 2015 9:32 pm
Year and Model: 850R 1996
Location: FLORIDA

Re: Issue with 96 850R Starting Not Turning Over

Post by wackenhut »

Okay, I will check it.
wackenhut
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Joined: Tue Jul 07, 2015 9:32 pm
Year and Model: 850R 1996
Location: FLORIDA

Re: Issue with 96 850R Starting Not Turning Over

Post by wackenhut »

I just initially opened the hood and both posts were somewhat hot. I drove for about 5 minutes and checked the posts again. The positive one seemed to be hotter. In this case, what should I do?

Thank you.
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abscate
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Re: Issue with 96 850R Starting Not Turning Over

Post by abscate »

Take off both clamps and get every thing shiny clean with a wire brush

Reconnect, then look for voltage drops between the ends of the wires and the clamps with the car running and lights on, and report back
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wackenhut
Posts: 185
Joined: Tue Jul 07, 2015 9:32 pm
Year and Model: 850R 1996
Location: FLORIDA

Re: Issue with 96 850R Starting Not Turning Over

Post by wackenhut »

The voltmeter reads about 14 volts. I drove it today and it would not start again. Lifted the hood and waited about 5 minutes. Not sure if the lifting of the hood did anything. After about 5 minutes it started again. Very strange and not sure what else could be the problem. the positive lug is not heating up.
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jreed
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Re: Issue with 96 850R Starting Not Turning Over

Post by jreed »

Would it be possible for you to measure the voltage during starting? You can test the battery and the starter terminals. That test might reveal the source of the problem.
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94
wackenhut
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Joined: Tue Jul 07, 2015 9:32 pm
Year and Model: 850R 1996
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Re: Issue with 96 850R Starting Not Turning Over

Post by wackenhut »

What does the B cable do that runs from the battery to the fuse box? Does this have any purpose in starting the engine? Is there a way to test if the cable is good or bad?

Also, would a fuse cause this? Maybe the number 1 fuse or fuel pump relay?

Thank you.
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Re: Issue with 96 850R Starting Not Turning Over

Post by scot850 »

I know the B+ cable in the 98-00 cars is a known issue and can be dangerous when they get really bad as they can short out. I can't unfortunately picture the 850 version as been way too long to know if it has a similar issue.

As to it's purpose it runs power up to the main fuse box. Having not actually had one fail completely I am not sure if this would cause your problem.

The fact that your issue would appear to be temperature related it would point to electrical wiring on contacts failing which gets worse when hot. This could point to many items, but you have replaced many items so as has been suggested it may be bad earthing/broken/missing earth wires, or bad positive feed wires to the starter.

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Re: Issue with 96 850R Starting Not Turning Over

Post by erikv11 »

For the record, B+ cable problems are basically nonexistent on 850s. Test it with a voltmeter.

I agree must be electrical.

Fuel pump relay - no. This gives a no-start, but the car would crank just fine.

Fuse, no. They are either working (intact) or not.
'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, 293k
'06 S60 R, 167k
'07 XC70, 170k
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
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Re: Issue with 96 850R Starting Not Turning Over

Post by misha »

I had bad b+ cable from battery to starter.
I had almost 1v voltage drop on it when everything is warmed up under the hood.
Cold test was always ok and without voltage drop.
'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
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erikv11
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Re: Issue with 96 850R Starting Not Turning Over

Post by erikv11 »

The cable from the battery to the starter is not the B+ cable, it's the starter cable. Agreed, basically every 850 the starter cable has gone bad by now or is going.

As posted above the B+ cable runs from battery to fuse box. The B+ is plagued on 99+ P80 cars but basically trouble free on 850s.
'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, 293k
'06 S60 R, 167k
'07 XC70, 170k
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
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