IPD sale XeMODeX - Experts in Volvo Electronics
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

Mystery wire...

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

[email protected]
Posts: 3
Joined: Mon Apr 11, 2016 8:31 am
Year and Model: 1994 850t estste
Location: UK
Has thanked: 0
Been thanked: 0
Great Britain
[email protected]

Mystery wire...

Post by [email protected] » Mon Apr 11, 2016 8:50 am

Sorry if this has been done before but I can't seem to find an answer....

Just below and slightly in front of where the the camshaft position sensor wires come from the sender a lead emerges from the cylinder head area and terminates in a 2 pin white male connector. And in my case that it all it does. It is not actually connected to anything. In my admittedly limited experience manufacturers don't usually hang spare leads out of motors but I can find no mention of this & can't see a picture online or in the Haynes manual. Or indeed the Volvo service manual.

Is it a "spare" intended to hook up to something not fitted in an 850T or should it actually plug in somewhere. I can see no corresponding female socket.

The car (1994 850T estate) runs fine.

kahl
Posts: 943
Joined: Sat Oct 27, 2012 7:01 pm
Year and Model: 2000V70XC
Location: columbus ohio
Has thanked: 0
Been thanked: 7 times
United States of America
kahl

Re: Mystery wire...

Post by kahl » Mon Apr 11, 2016 10:06 am

I can't remember if your car has a PTC on the plastic intake pipe from the air cleaner box to the turbo. The PTC is a two prong fitting. I also recall there is a plug on the air cleaner box. It's been about 10 years since I had my 94 850 turbo.

User avatar
theWIFES_S70
Posts: 1143
Joined: Fri Jul 24, 2015 10:34 pm
Year and Model: 1998 S70 base
Location: Queens, New York
Has thanked: 33 times
Been thanked: 25 times
Peru
theWIFES_S70

Re: Mystery wire...

Post by theWIFES_S70 » Mon Apr 11, 2016 10:13 am

Is it this guy?

Image
1998 Volvo S70, N/A, 5-speed, 183K
2007 Volvo S40, 2.4i, 5-speed, 97K

Ozark Lee
MVS Moderator
Posts: 14798
Joined: Thu Sep 07, 2006 8:24 am
Year and Model: Many Volvos
Location: USA Midwest
Has thanked: 4 times
Been thanked: 50 times
United States of America
Ozark Lee

Re: Mystery wire...

Post by Ozark Lee » Mon Apr 11, 2016 6:33 pm

The PTC is a very good guess. It isn't a sensor, it is a heater for the return vent hole on the PCV system and it has no real impact on how the car runs in the short term. The socket where the electrical to the PTC plugs in is pretty well hidden on the intake snorkel just before it enters the turbocharger.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

kaneelschep
Posts: 277
Joined: Wed Jun 19, 2013 1:37 pm
Year and Model: '96 850 2liter t5
Location: Holland
Has thanked: 0
Been thanked: 1 time
Netherlands
kaneelschep

Re: Mystery wire...

Post by kaneelschep » Tue Apr 12, 2016 2:35 pm

Maybe post a picture? Thats always easy ;)

[email protected]
Posts: 3
Joined: Mon Apr 11, 2016 8:31 am
Year and Model: 1994 850t estste
Location: UK
Has thanked: 0
Been thanked: 0
Great Britain
[email protected]

Re: Mystery wire...

Post by [email protected] » Wed Apr 13, 2016 9:55 am

Pictures always help but without removing the airbox, not easy. These are as good as I could get with a 'phone.

http://www.bysonleather.co.uk/Odds%20&%20Sods.htm

[email protected]
Posts: 3
Joined: Mon Apr 11, 2016 8:31 am
Year and Model: 1994 850t estste
Location: UK
Has thanked: 0
Been thanked: 0
Great Britain
[email protected]

Re: Mystery wire...

Post by [email protected] » Wed Apr 13, 2016 10:17 am

Solved. Marco has it. At some stage someone has swapped out the crank position sensor and left the old unit hanging about in there. The actual unit was JUST visible at an almost impossible angle, tucked up under the assorted cables & "stuff". The lead went down behind the engine upper mount plate and looked as if it emerged from the head area. NOT easy to see exactly what is going on round there :-)

Who thought that was a good idea then ? :-)

User avatar
theWIFES_S70
Posts: 1143
Joined: Fri Jul 24, 2015 10:34 pm
Year and Model: 1998 S70 base
Location: Queens, New York
Has thanked: 33 times
Been thanked: 25 times
Peru
theWIFES_S70

Re: Mystery wire...

Post by theWIFES_S70 » Wed Apr 13, 2016 11:07 am

Oh my gosh, someone left an old crankshaft position sensor in there? I would've cut the connector off if I couldn't get it out. (You never know when you'll need a connector!) That's nuts, though. Glad we figured it out!
1998 Volvo S70, N/A, 5-speed, 183K
2007 Volvo S40, 2.4i, 5-speed, 97K

User avatar
abscate
MVS Moderator
Posts: 21115
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 318 times
Been thanked: 988 times
Trinidad & Tobago
abscate

Re: Mystery wire...

Post by abscate » Wed Apr 13, 2016 12:14 pm

[email protected] wrote:Solved. Marco has it. At some stage someone has swapped out the crank position sensor and left the old unit hanging about in there. The actual unit was JUST visible at an almost impossible angle, tucked up under the assorted cables & "stuff". The lead went down behind the engine upper mount plate and looked as if it emerged from the head area. NOT easy to see exactly what is going on round there :-)

Who thought that was a good idea then ? :-)
something about leaving an old part on a car is just advanced hackery...thats just wrong...
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

Post Reply
  • Similar Topics
    Replies
    Views
    Last post