Boost Pressure Sensor

Mbday1 · Post by **Mbday1** » 05 Jan 2016, 19:47

[/ 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 · Post by **jcdillin** » 06 Jan 2016, 06:33

What plugs did you use and did you gap them?

biohazrd76 · Post by **biohazrd76** » 06 Jan 2016, 11:36

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

Post by **abscate** » 06 Jan 2016, 12:03

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.

Post by **bmdubya1198** » 06 Jan 2016, 16:02

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.

biohazrd76 · Post by **biohazrd76** » 08 Jan 2016, 06:47

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!!!!