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1996 850 R Strange cutout with all newish ignition parts 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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Clemens
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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by Clemens » Thu Mar 12, 2020 5:18 am

crap, problem persists. it seems that it only happens once the car has warmed up. it misses under full throttle above 4000 rpm and at idle. for the first few miles als seems fine and dandy. are we still thinking cap and rotor? need to switch them with the 94 to see if that helps.
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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abscate
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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by abscate » Thu Mar 12, 2020 5:33 am

Definitely. Make sure you push the connectors in.
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Clemens
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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by Clemens » Thu Mar 12, 2020 8:29 am

I just stopped by my local indie and he suggested that it could be fuel starvation. Does that soubd plausible?
The fuel filter is 4 years old, fuel pump and fuel pump relay are probably original.
When fuel pumps were dying on my 854 I always had no start issues but all was fine as soon as it was running.
I am toggling between being motivated to find the source and throwing the towel...
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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abscate
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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by abscate » Thu Mar 12, 2020 8:39 am

you can monitor fuel pressure either in VIDA or with a gauge.

A 'diagnosis' of fuel starvation just invites a parts dart solution of lots of high margin, labor intensive parts swapping.
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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by Clemens » Thu Mar 12, 2020 11:10 am

okay, where could I get Vida from?

also, could brick diag read the fuel pressure?
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by misha » Thu Mar 12, 2020 12:03 pm

VIDA on pre '99?
'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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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by abscate » Thu Mar 12, 2020 3:27 pm

misha wrote:
Thu Mar 12, 2020 12:03 pm
VIDA on pre '99?
:oops:

Corrected above.

Serbia 99 - US 2
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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by misha » Thu Mar 12, 2020 4:34 pm

@clemens
Swap cap & rotor from '94 T5 so we can rule out ignition parts.

If problem persists....remove fuel pump relay,open it up and take a close look for cold or cracked solders.
Since the problem appears when car is warmed up and electrical parts like relays shows their weakness when they are warmed up...it could be a fuel pump relay...or main fuel injection relay(grey one) on fan shroud.
'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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Clemens
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Year and Model: 96 855 R + 94 855 T5
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Has thanked: 91 times
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Clemens

Re: 1996 850 R Strange cutout with all newish ignition parts

Post by Clemens » Thu Mar 12, 2020 5:35 pm

Thanks Misha. Will try tomorrow.
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by amblerman » Fri Mar 13, 2020 9:14 am

Clemens wrote:
Tue Feb 18, 2020 12:11 pm
One of them was a tad brownish around the shaft, maybe oil that got down the upper part of the plug when refilling oil?
That brownish stain is called a corona stain.. No that wasn't a lame attempt at a joke based on our current global crisis.

See here:

http://www.ngk-sparkplugs.jp/english/te ... index.html

Good description here from the folks at NGK.
-A <edited to fix link>

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