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99 T5 - what's this thing 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
j-dawg
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Year and Model: 1999 V70 T5
Location: Waco, TX
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99 T5 - what's this thing

Post by j-dawg » Wed Feb 15, 2017 8:51 pm

I've got the intake manifold off and noticed a wire and connector loose from their sensor. The sensor itself is pretty small, and it looks like the connector for the sole wire broke off long ago, apparently with no ill effects.

Anyone know what this is?
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1999 V70 T5 5-SPD | ~265k mi | by my deeds, i honor him: T5 | i am awaited in volvhalla

2016 FORD FIESTA ST | consistently works

1995 MERCEDES E320 COUPE | pretty

j-dawg
Posts: 846
Joined: Sat Apr 20, 2013 10:56 am
Year and Model: 1999 V70 T5
Location: Waco, TX
United States of America

Re: 99 T5 - what's this thing  Topic is solved

Post by j-dawg » Wed Feb 15, 2017 8:55 pm

Welp, looks like the oil pressure sensor. Curious that I haven't seen any oil pressure warning lights, then.

Does anyone know if I can change this without dumping the oil? I was hoping to run on this oil for a few dozen miles after I get the head back together and then change it, but I probably need the intake manifold off to change the sensor, and I'm not looking forward to doing that again.
1999 V70 T5 5-SPD | ~265k mi | by my deeds, i honor him: T5 | i am awaited in volvhalla

2016 FORD FIESTA ST | consistently works

1995 MERCEDES E320 COUPE | pretty

erikv11
Posts: 7549
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850s, S/V70s, 06 S60
Location: Iowa
United States of America

Re: 99 T5 - what's this thing

Post by erikv11 » Wed Feb 15, 2017 9:31 pm

Yes you can plug/unplug oil pressure sensor without spilling any oil. I have plugged/unplugged it without removing anything (e.g. intake manifold) on my NA, but never tried it on a turbo model. Not sure how tough the access is.
'95 854 T5-R || m4.4 || 180 k
'96 855 NA || 135 k
'98 V70 GLT || T5 tune-injectors-turbo || 265 k
'06 S60 R || 134 k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 NA S70 174 k

ecbsykes
Posts: 1477
Joined: Sun Mar 08, 2009 3:43 pm
Year and Model: 2000 V70XC
Location: Charleston, SC
United States of America

Re: 99 T5 - what's this thing

Post by ecbsykes » Wed Feb 15, 2017 9:42 pm

Is your oil pressure warning light burned out?
Ed Sykes
2000 V70XC - Emerald Green - 250,000 miles

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abscate
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Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 1999 V70T5, 2005 V70
Location: NYC
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Re: 99 T5 - what's this thing

Post by abscate » Thu Feb 16, 2017 4:21 am

Yikes. That can end badly. Bulb must be out
"Its not your ECU, ECM, nor your computer"

1999 V70 T5 M56
2003 Beetle Conv M5
2002 Eurovan
2005 V70 NA M5
2006 BMW X3 E83
Air cooled VW WIP

A houseful of young ladies seats 7
Shepard Husky, Lab
Grey, ginger,black cats

Lots of boats

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rspi
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Year and Model: 850 T-5R Wagon
Location: Albuquerque, NM
United States of America

Re: 99 T5 - what's this thing

Post by rspi » Thu Feb 16, 2017 8:45 am

Strange thing with these cars, when you unplug that sensor, the light does NOT come on. Hook it back up and the light works as normal.
'95 855 T-5R, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red
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erikv11
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Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850s, S/V70s, 06 S60
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Re: 99 T5 - what's this thing

Post by erikv11 » Thu Feb 16, 2017 9:30 am

Robert I actually had the light come on on my 96 NA, because the sensor somehow came unplugged. Then I plugged it back in and the light went off. That's the main reason I know about plugging/unplugging it. So maybe that's not always true.
'95 854 T5-R || m4.4 || 180 k
'96 855 NA || 135 k
'98 V70 GLT || T5 tune-injectors-turbo || 265 k
'06 S60 R || 134 k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 NA S70 174 k

j-dawg
Posts: 846
Joined: Sat Apr 20, 2013 10:56 am
Year and Model: 1999 V70 T5
Location: Waco, TX
United States of America

Re: 99 T5 - what's this thing

Post by j-dawg » Thu Feb 16, 2017 10:18 am

I turned the key to see if the oil light would come on. I didn't see it in my brief scan of the instrument panel, but then I heard gasoline spraying out of the open fuel line and quickly switched it off. I am an idiot.

Further evidence of idiocy: I was using a wooden dowel to find BDC so I could stuff a rope in Cylinder 4 to swap the valve stem seals. I heard a "snap" noise and withdrew the dowel to find it had snapped - but thankfully not broken - within the cylinder. Breathing a sigh of relief, I immediately flipped the dowel over and stuck the other end in the cylinder, which did snap off inside. I had to spend the next half hour feverishly extracting the (fortunately small) sliver of wood using compressed air and a zip tie with a blob of grease on it. I was nearly convinced that I'd have to pull the head.

Not sure why this happened twice on cylinder 4 when cylinders 1, 2, and 3 showed no sign of it, but after getting burned twice I learned my lesson. I could probably break a car just by sitting in it.
1999 V70 T5 5-SPD | ~265k mi | by my deeds, i honor him: T5 | i am awaited in volvhalla

2016 FORD FIESTA ST | consistently works

1995 MERCEDES E320 COUPE | pretty

User avatar
abscate
MVS Moderator
Posts: 10399
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 1999 V70T5, 2005 V70
Location: NYC
Trinidad & Tobago

Re: 99 T5 - what's this thing

Post by abscate » Thu Feb 16, 2017 10:55 am

You still pale compared to the idiot here who installed his intercooler upside down
"Its not your ECU, ECM, nor your computer"

1999 V70 T5 M56
2003 Beetle Conv M5
2002 Eurovan
2005 V70 NA M5
2006 BMW X3 E83
Air cooled VW WIP

A houseful of young ladies seats 7
Shepard Husky, Lab
Grey, ginger,black cats

Lots of boats

amblerman
Posts: 30
Joined: Wed Jan 18, 2017 3:29 pm
Year and Model: 1999 S70
Location: Pennsylvania
United States of America

Re: 99 T5 - what's this thing

Post by amblerman » Thu Feb 16, 2017 11:58 am

If you look at the 4th picture, it also looks like you're missing a bolt for your starter bracket.

Strange thing is, I too am missing that and will be picking up a replacement bolt from dealer later today.

-A

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