1995 850 turbo wagon

[slimflex2]

check for compression first. the first five codes are misfire. how good are your spark plugs?

[wwn707ap]

Spark plugs replaced 15k ago with oem, will check compression & plug condition tomorrow.

Can anyone answer the questions below from my previous post?
Here they are again…updated slightly?

Also, have codes p0133, p0137, p0172 & p0440, I believe these are twc, o2 related, is that correct?
New fpr, coil-igniter, fuel pressure @ 48, still no start, thinking "Cam Position Sensor" is bad, is there a way to "test the cam position sensor on the engine or off"?

2.) Could a blocked twc cause a no spark problem?
3.) Once, the problem is fixed & the engine has started, after a cool down, would it be a good idea to clean the PVC-oil trap before it leaves the garage?
I saw the post here, on how to get to it but not clean it, all help greatly appreciated.
4.) Also, saw a note about cam position sensor not liking rainy weather spring like weather, is that true or an urban legend?
5.) Occasionally, with the car parked. down hill, in a long heavy rain. the drivers floor will get damp, have not been able to locate a leak, no interior wet marks on headliner or door…

Thank you

[slimflex2]

yea codes are o2 related, and vacuum leak related too. l have no idea on how to check for a cam position sensor, you might want to get one from the junk yard and try if it will help.
2. whats TWC if l may ask.
3. when was the last time your replaced your pcv. a clogged pcv wont cause a no start issue but will cause crankcase pressure that might blow your seals causing an oil leak.if your car starts, warm it up and pull the oil dipstick, if white smoke blows out of the tube, pcv needs replacing. if its not smoking from the tube then you should be Good.
4. l cant answer that because l have never experienced that. the only way to tell is replace the cam position sensor and see if that helps.
5. does the floor get wet with the AC on or heat on or it just get wet just on rainy days?

[erikv11]

Spark plugs replaced 15k ago with oem, will check compression & plug condition tomorrow.

Can anyone answer the questions below from my previous post?
Here they are again…updated slightly?

Also, have codes p0133, p0137, p0172 & p0440, I believe these are twc, o2 related, is that correct?
New fpr, coil-igniter, fuel pressure @ 48, still no start, thinking "Cam Position Sensor" is bad, is there a way to "test the cam position sensor on the engine or off"?

2.) Could a blocked twc cause a no spark problem?
3.) Once, the problem is fixed & the engine has started, after a cool down, would it be a good idea to clean the PVC-oil trap before it leaves the garage?
I saw the post here, on how to get to it but not clean it, all help greatly appreciated.
4.) Also, saw a note about cam position sensor not liking rainy weather spring like weather, is that true or an urban legend?
5.) Occasionally, with the car parked. down hill, in a long heavy rain. the drivers floor will get damp, have not been able to locate a leak, no interior wet marks on headliner or door…

Thank you

p0133 is front O2 sensor
p0137 is rear O2 sensor

Both sensors may need to be replaced, but first find and fix all vacuum leaks, see below. Then if both codes are still showing I would start with the rear O2 sensor, see if replacing it makes both codes go away. Bad O2 sensors could technically cause a no-start if the front one was completely ruined but I don't think so. Even if it did, it should still start up if you unplug the front O2 sensor. You could try that.

p0172 is almost always due to a vacuum leak. Find and fix all vacuum leaks once you have the car running.

p0440 is a code for the EVAP system. It is an emissions thing and you can totally ignore it until you get the more important stuff figured out. Likely the J hose on the canister or the hose near the rollover valve but just forget it for now.

I would try a cam position sensor (CPS) from a junkyard, this was the cause of my most recent no-start and it is a pretty common one at this age. A bad CPS causes no spark. I don;t know of any way to test the CPS. Could also be the crank sensor but try the CPS first.

So to summarize (my numbers, not meant to match yours):
(1) Get it running. I'd try the CPS.
(2) Eliminate all vacuum leaks.
(3) Clear all codes, check for codes again, deal with O2 sensors if you still need to.
(4) Check the PCV and replace if it is needed (it probably is).
(5) Much later, turn your attention to the EVAP system.
(6) Wet floor is probably the sunroof drains are clogged, or leaking around the windshield.

[wwn707ap]

First TY "erikvII" for your detailed help.

I will do, "in order," your list of fixes.
In my question about the pvc-oil tray, could you help clear up the proper terminology. A few months ago, I was told by a local Volvo Dealer service dept that the 850 (2.3), does not actually have a PCV valve, just the oil tray.
Is it oil tray or PVC-oil tray?

Anyone like to add anything, everything is appreciated…

Post an update when I complete the to do list.

This forum is super helpful & very knowledgeable.

[slimflex2]

all 850s have a pcv oil trap and hoses that runs from the top of the engine through the oil trap back to the PTC. whats oil tray?

[jblackburn]

PCV system in all its glory:



https://www.matthewsvolvosite.com/forums ... =1&t=47793

[wwn707ap]

Thank You

[wwn707ap]

Engine running, very smoothly
Step taken:
1.) new cam position sensor
2.) new fuel pressure relay
3.) new Bosch plugs, gap .028
4.) replaced deteriorated vacuum hoses
5.) cleaned air box filter with air pressure
6.) next week replace twc at another shop

Thanks to all for the expert advise, I learned a lot, otherwise I would have been lost.
George

[slimflex2]

Engine running, very smoothly
Step taken:
1.) new cam position sensor
2.) new fuel pressure relay
3.) new Bosch plugs, gap .028
4.) replaced deteriorated vacuum hoses
5.) cleaned air box filter with air pressure
6.) next week replace twc at another shop

Thanks to all for the expert advise, I learned a lot, otherwise I would have been lost.
George

glad you got it running now. cheers