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1996 (corrected) 850 NA hot stalling

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

850oldschool
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Year and Model: 1995 850 NA
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Re: 1996 (corrected) 850 NA hot stalling

Post by 850oldschool »

abscate wrote: Sat Nov 09, 2019 8:43 amDone!
Thank you!
erikv11 wrote: Fri Nov 08, 2019 2:10 pm Junkyard for the harness and/or connectors - very, very cheap and you have several to choose from in Minneapolis.
It's about a 50 mile round trip to the u-pull, but they do currently have a few P80's. I'd need to make it worth my while. The shell of the connector in the picture is actually in pretty good shape for having been baked right by the engine for over 20 years. There's a fair amount of buried corrosion when you look down into the terminals with a bright light. I'll try some experiments to see if it can be cleaned up. I think a lot of frustrating unreliability is caused by bad sensor connections.
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erikv11
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Re: 1996 (corrected) 850 NA hot stalling

Post by erikv11 »

At least it's just a knock sensor here - the only effect corrosion would have is a knock sensor code, rather than any actual engine function. In this case of course. I agree, dirty connectors are giving more and more issues these days, they are showing up a fair bit on the forums.

People really like DeoxIT for cleaning connectors. I've used it a few times seems to be helpful.
'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
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
850oldschool
Posts: 142
Joined: Sat Oct 19, 2019 1:21 pm
Year and Model: 1995 850 NA
Location: Minneapolis, MN
Been thanked: 13 times

Re: 1996 (corrected) 850 NA hot stalling

Post by 850oldschool »

Okay, I got the wiring harness (9442158) and it has 2 male plugs on it, just like the plugs on the knock sensors. WTF? It's number 31 on the parts diagram, and right next to it is number 30, which is described as "knock sensor".

It says "made in Finland" on it though, which is pretty cool.

A little more digging, however has turned up a 2 pin connector identical to the one I removed with the severed wires available from Volvo for under 4 bucks, part number 979040, so I can do a gender change on the new harness. Apparently they are still using these same 2 pin connectors on 2019 V90's!!
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RickHaleParker
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Re: 1996 (corrected) 850 NA hot stalling

Post by RickHaleParker »

850oldschool wrote: Fri Nov 15, 2019 6:37 pm Okay, I got the wiring harness (9442158) and it has 2 male plugs on it,
I think they sent you the wrong harness. Is it marked 9442158? Fitment for 9442158 is: 850 1994 - 1997.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
850oldschool
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Joined: Sat Oct 19, 2019 1:21 pm
Year and Model: 1995 850 NA
Location: Minneapolis, MN
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Re: 1996 (corrected) 850 NA hot stalling

Post by 850oldschool »

Clearly marked with the proper part number. Here I applied a filter to the relevant area of the picture they have at www.volvopartswebstore.com so you can see the connectors better, and also enlarged the relevant area of the parts diagram(#31). The connectors are male, just like the knock sensors themselves.
Attachments
wiring harness-retinex.png
wiring harness-retinex.png (393.83 KiB) Viewed 45 times
wiring harness2.jpg
wiring harness2.jpg (47.2 KiB) Viewed 45 times
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erikv11
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Re: 1996 (corrected) 850 NA hot stalling

Post by erikv11 »

Oh it is the right part. Part number 31 is to adapt an old wiring harness (two female plugs) to a new knock sensor (one male plug, part 30). It is of course not a replacement for a bad harness, you'd need a whole new harness for that. Maybe you found your way out of things with the adapter but such is the risk with a google-based approach to things. Wish I had paid attention to the other posts about what you actually need, sorry about that.

But that "long" trip to the junk yard would have officially been worth it by now! ;)
'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
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
850oldschool
Posts: 142
Joined: Sat Oct 19, 2019 1:21 pm
Year and Model: 1995 850 NA
Location: Minneapolis, MN
Been thanked: 13 times

Re: 1996 (corrected) 850 NA hot stalling

Post by 850oldschool »

I'm really not sure what you're supposed to use 31 for. The Bosch 0 261 231 046 discrete knock sensors look like the picture below, with male connectors. Maybe in the early years there were knock sensors with female 2 pin connectors?

The part number (1270492) associated with 30 (pair of knock sensors with wiring loom) on the diagram looks a bit different from the drawing. 31 has a 3 pin female JPT connector, while 30 has a 3 pin male JPT connector.

The good news is that the online Volvo OEM parts sellers have the proper female 2 pin JPT connector (979040) brand new for under $4, so I don't have to spend an hour driving to and from the junkyard to get one, I can just get it delivered to my door, and I can repair my existing wiring.
Attachments
Bosch 0 261 231 046.jpeg
Bosch 0 261 231 046.jpeg (70.43 KiB) Viewed 37 times
volvo 1270492.jpg
volvo 1270492.jpg (42.73 KiB) Viewed 37 times
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erikv11
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Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
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Re: 1996 (corrected) 850 NA hot stalling

Post by erikv11 »

Pretty sure the knock sensors didn't change across early P80 cars. They are just simple lo-tech microphones. Been too long (thankfully) since I was pulling lots of intake manifolds, I don't recall ever seeing a difference.

But sounds like you're on it! Let us know what finally fixes it, surely others will run into this problem at some point.
'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
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
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RickHaleParker
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Joined: Mon May 25, 2015 2:30 pm
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Re: 1996 (corrected) 850 NA hot stalling

Post by RickHaleParker »

850oldschool wrote: Sat Nov 16, 2019 10:56 am The good news is that the online Volvo OEM parts sellers have the proper female 2 pin JPT connector (979040) brand new for under $4
979040 is the plastic housing, it may or may not come with pins (978261) ans seals (970772).
Did you check the other end of the harness to make sure it will connect?
Is there a part number on the Knock sensors that are on the car?
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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