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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
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Clemens
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1996 850 R Strange cutout with all newish ignition parts

Post by Clemens » Tue Feb 18, 2020 4:55 am

So this time, it is my 96 R that is giving me headaches.

Thing is, when flooring it, above 4000 rpm something feels like cutting out, kinda like misfiring. And at idle when warm, it cuts out a bit as well.

If someone described the problem, I would suggest replacing the ignition components. But rhey are all newish.

All ignition components that I can think of are new or newish (maximum 4 yrs old and 20.000, maybe 25.000 miles on thwm).
all parts are blue box Volvo or OEM.

new in 2016 parts: spark plugs, distributor (cap and rotor), wires
new in 2017-18: cam sensor, crank sensor, throttle position sensor
Fall 2019: TME catback exhaust
new as if today: all 6 wires (Bourgicord) and Bosch coil.
Car has good vacum and runs solid.
I think all vacum lines are max. 4 yrs old and TCV and wastegate diaphragms is new. boost is areound 15 psi on the stock gauge.

The problem I have appeared last fall. I thought new wires and a coil are the last things to replace (I swapped wires eith my 94T5 2 yrs ago).

could the new exhaust I installed last fall lead to fuel cutoff situations? if so, this woulfn't explain the sporadic misfiring at idle.

what else could it be? bad ground comnections, dirty rotor (although just 4 yrs old), knock sensor, MAF?

And of course, I have no CEL on.

Any help would be appreciated.

Thanks
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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Re: Strange cutout with all newish ignition parts

Post by wizechatmgr » Tue Feb 18, 2020 6:43 am

Happen to check fuel rail pressure when this occurs?
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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by abscate » Tue Feb 18, 2020 8:23 am

If someone described the problem, I would suggest replacing the ignition components. But rhey are all newish.
I think I would try a new set of plugs - I had one go bad one week after install.
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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by misha » Tue Feb 18, 2020 8:59 am

Can you find someone who can perform live data while driving?
Are there any pending codes present?

Cel will light ON when permanent fault is stored after a few driving cycles...but there can be pending codes stored without turning ON cel.....yet.
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'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
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History of Volvos in the family:
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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by Clemens » Tue Feb 18, 2020 9:04 am

For live codes I will need VOL FCR, right?

What I found out meanwhile: the cap had some kinda metall flakes on the conductive elements. Seems to run better now. Wonder where that comes from?

I'll swap plugs with my 94 T5 if the problem persists. Thanks for the idea.
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 Clemens » Tue Feb 18, 2020 9:32 am

No, still there.
Next step: switching sparkplugs
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 » Tue Feb 18, 2020 9:42 am

Vol-Fcr is for M4.4.
Does your R have m4.3 or m4.4 ecu?
Are spark plugs Volvo plugs?
'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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Re: 1996 850 R Strange cutout with all newish ignition parts

Post by Clemens » Tue Feb 18, 2020 10:24 am

It has the M4.3 ECU and Volvo plugs. They are either 4 or 2 years old. I will pull them tomorrow and see if they are in good condition and gapped correctly. Then I will swap them with the ones out of my 94. The 94 runs quite smooth right now. If the problem trnasfers, I know it is the plugs.
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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

Post by Clemens » Tue Feb 18, 2020 12:11 pm

Now I switched the plugs.
The ones out the 94T5 were a little on the darkish side, maybe carbon buildup. The ones out of the teoublesome 96 were whitish. Photo attached. One of them was a tad brownish around the shaft, maybe oil that got down the upper part of the plug when refilling oil?

Let's see how it runs tomorrow, because the cutouts at idle only happen when it is warm and in D (not in N).
Attachments
20200218_195353.jpg
what is that brownish ring at thw bottom of the insulator?
20200218_194559.jpg
the plugs out of the troublesome 96
Last edited by Clemens on Wed Feb 19, 2020 12:16 am, edited 1 time in total.
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 » Tue Feb 18, 2020 4:11 pm

Thats not from oil....i guess it is from the heat.
Whiteish look is ok....good combustion sign.
'94 T5 could run a bit rich or driven on short distances and that's why they are darker.
These users thanked the author misha for the post:
Clemens
'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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