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Boost Pressure Sensor

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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Mbday1
Posts: 1
Joined: Tue Jan 05, 2016 7:15 pm
Year and Model: 1999 v70
Location: Stow ohio

Boost Pressure Sensor

Post by Mbday1 »

Code: Select all

[/ my 1999 v70 2.4 5 cylinder is running rough and stalling after replacing spark plugs . Found dark oil down in one of the coil packs ...the code said Boost Pressure sensor ??
jcdillin
Posts: 162
Joined: Thu Oct 30, 2014 1:32 pm
Year and Model: 06 V70R
Location: Jacksonville Florida

Re: Boost Pressure Sensor

Post by jcdillin »

What plugs did you use and did you gap them?
biohazrd76
Posts: 80
Joined: Mon Jan 04, 2016 7:31 pm
Year and Model: 1997 850R
Location: pittsburgh pa

Re: Boost Pressure Sensor

Post by biohazrd76 »

If there's oil around your plugs you may have a clogged egr system, a video told me to hold your hand over the oil cap opening while at idle you should feel vacuum, not pressure, if you see smoke and have positive pressure that's a clog in egr. Check all plug wires and add some dielectric grease under boots
1997 850 R, black.
Ipd HD tcv, msd coil pack, ipd HD cbv, ipd stage 1 ecu flash, iridium plugs,heavy gauge plug wires, airbox cover delete, k&N cone filter directly before maf, ipd HD end links.
Graveyard: 1993 850 glt, NA 168 bhp,gold. Hit and run 2009 totaled
1995 850 Turbo, 222 bhp totaled
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abscate
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Re: Boost Pressure Sensor

Post by abscate »

More likely a bad or loose coil pack - did you get the 10 mm bolts nice and tight when you replaced the coils?

A lot of oil is bad and will short out the spark - a clogged PVC is a likely culprit here, too.
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Re: Boost Pressure Sensor

Post by bmdubya1198 »

biohazrd76 wrote:If there's oil around your plugs you may have a clogged egr system, a video told me to hold your hand over the oil cap opening while at idle you should feel vacuum, not pressure, if you see smoke and have positive pressure that's a clog in egr. Check all plug wires and add some dielectric grease under boots
Do you mean PCV? I don't think EGR has anything to do with that.
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biohazrd76
Posts: 80
Joined: Mon Jan 04, 2016 7:31 pm
Year and Model: 1997 850R
Location: pittsburgh pa

Re: Boost Pressure Sensor

Post by biohazrd76 »

Pvc egr I always mix these two up. Yes the pcv system is a fickle beast. All the of my 850s had broken hard plastic line that passes under intake manifold. First ditch the airbox, intake tube(unplug hoses from sensor) and distributor cap... Then you can see the pcv.It's wrapped in insulation so you'll have to go in like a surgeon and open the insulation like a hot dog bun!!! There are two lines Inside I bet 99% your 3/8 dia hard line is cracked somewhere. Also the 1/8 line is hard and will likely crack due to handling of the assembly. This is not for the faint of heart as thinks get dicey if you damage it beneath the intake so be careful!!!!
1997 850 R, black.
Ipd HD tcv, msd coil pack, ipd HD cbv, ipd stage 1 ecu flash, iridium plugs,heavy gauge plug wires, airbox cover delete, k&N cone filter directly before maf, ipd HD end links.
Graveyard: 1993 850 glt, NA 168 bhp,gold. Hit and run 2009 totaled
1995 850 Turbo, 222 bhp totaled
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