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Smoke from dipstick, changed PVC and cleaned PTC

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

Smoke from dipstick, changed PVC and cleaned PTC

Postby dereswyman » 12 Oct 2009, 02:47

I just replaced the PVC system and cleaned out the PTC nipple. I still have smoke coming from the dipstick. What else could be it? This car is starting to get on my nerves. It drives really nicely but with this positive pressure, I don't know how much longer it'll last. Does it take time for the smoke to disappear? Would doing an oil change help it? I've done about 1700 miles since the last change.
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby misha » 12 Oct 2009, 22:43

Did you cleaned up the holes in engine block where hoses from pcv box are connected?If not,it's the same like you didn't replaced pcv system.

If you did...i think i read somewhere at this forum that some members also had a smoke from a dipstick after pcv job and after a couple hundreds of miles it dissapeared.
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby dereswyman » 13 Oct 2009, 01:04

Yep, the holes were cleaned. But I guess I'll just put in a few miles into it first and see how it goes. I'll also get the oil changed asap. Would performing a seafoam cleaning help it?

Thanks for your help.
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby wjhandy850 » 13 Oct 2009, 13:53

I too am getting smoke after replacing pvc system on my 97 850 GLT. I cleaned the PTC with various cleaners. I didn't use the pipe cleaners as previously directed I cleaned the holes in the block but they didn't seem to be noticeably blocked I got a vacuum to draw some oil through. I also just got the head gasket replaced with a used rebuilt head. What are the proper Volvo servicing procedure on cleaning/replacing pvc system? I am now riding with dipstick slightly opened to keep the pressure from building up.
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby volvomileage » 13 Oct 2009, 22:03

reading all this and having the same problem i am woundering if a defective or stuck egr valve can cause this condition..

the two holes on the block were barely dirty when i took it apart there was traces of solid oil really nothing to write home about, but the holes were clear no blockage... plus the oil trap was empty...but the rubber piping was gone unflexible and solid i guess the previous owner just cleaned everythig and put it back together...i changed about everything used and engine flush in the oil to finish with and oil change and still smokes..

i am really thinking the must be something wrong with the egr valve..

any ideas ?
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby misha » 13 Oct 2009, 22:13

I don't know guys...Mij have the same problem.He replaced complete pcv system and cleaned egr system (in detail) on his non turbo model and still have positive pressure from oil dipstick.No oil consumption and everything is fine with the car except that smoke from dipstick.
'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic/petrol+LPG
History of Volvos in the family:
'71 144 De luxe
'73 144 De luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
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misha
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby MadeInJapan » 17 Oct 2009, 14:12

Yeah, tell me about it! I also have an exhaust cam seal leak now- I just keep adding oil. I'm a bit afraid to fix that as the positive pressure is sure to blow another seal- maybe this time the rear-main- something I don't want.
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby volvomileage » 17 Oct 2009, 17:32

there must be something to do about this a part from letting it vent through the dipstick tube.....would seafoam help ?

can it be the egr valve ?

its frustrating and it is more frustrating after you have cleaned and changed for brand new components...gezzzz
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby MadeInJapan » 17 Oct 2009, 19:04

I don't know- maybe someone has a recommendation? I changed out all PCV components and even cleaned the passages into the engine was well as cleaning out the EGR (thoroughly), but still no big difference. I get no codes and the car runs great otherwise.
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby xb corp » 22 Oct 2009, 00:46

hey guys..
i have been seeing many 850s with this problem, especially the turbo ones. but instead of PCV or EGR systems fault, i am looking at other possibility.

why is there oil vapor/ smoke?
possibly because the oil is boiling, right? the temp of the oil could be exceeding 150C, so it starts to boil and cause smoke.

primarily we can say that the PCV is clogged so there is no proper circulation/ suction of the smoke off the engine internal. but what if the PCV is new? and there is still smoke?

so the next step is checking the engine cooling system.
first, make sure that your coolant passage is cleared, especially the thermostat and water pumps. next is the water circulation at the turbo.
then, you can check the engine oil cooler (for turbo only). the hoses on the right side of the radiator. changing oil frequently or changing with oil with higher boiling point could also solve this problem.

mine is 312,000km and upgraded to a bigger turbo which contributes "hotter" oil circulation, but no smoke. neither from dipstick, nor the oil filler cap.
on mineral Pennzoil API SM grade 20W-50 and Mann filter every 5000km.
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby wjhandy850 » 22 Oct 2009, 01:44

I cleaned my PTC again last night. There was signs that the system was trying hard to work with oil seeping through the connections. With the engine running, I popped of the top hose and didn't see any smoke. I bumped the throttle and the dipstick would draw in air on the return to idle. I poured some seafoam down the pipe coming up for the valve cover. I did this with the engine fully warmed with the engine off, and let it sit for a bit. I used less that a 1/3 of a bottle. I checked the dipstick, and it wasn't smoking. I think it cleared out the blockage in the separator. I cleaned the block ports when I replaced the separator but may have not done it well enough. They really didn't look bad, and the hoses were brittle, so I thought that to be the original problem. I will continue to check it, and report back. I am hoping this will be the fix for me.
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby voodoorobaz » 22 Oct 2009, 04:04

My son's car is a 98 s70 and his rear main is already blown due to the pcv being clogged and leaked real bad at the rear main seal. I told him to leave the dipstick up about 1/4 inch so the pressure can escape. Don't think its right but it doesn't leak as bad at the rear main seal. Temporary fix until i can dig into it and repair. This might work for you until you can figure it out so you don't blow any seals..
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby wjhandy850 » 24 Oct 2009, 00:32

I am now without a smoking dipstick, thanks to seafoam. I will plan to use it every other oil change to clean the oil separator. Pouring some down the hose coming from the valve cover definitely fixed my issue. Results came very quickly. Just don't run to long with it in the oil.
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Re: Smoke from dipstick, changed PVC and cleaned PTC

Postby C70ht » 24 Oct 2009, 02:37

wjhandy850 wrote:I am now without a smoking dipstick, thanks to seafoam. I will plan to use it every other oil change to clean the oil separator. Pouring some down the hose coming from the valve cover definitely fixed my issue. Results came very quickly. Just don't run to long with it in the oil.


Glad to hear that it worked. Did you pour the Seafoam down the PCV hose that goes from the valve cover to the PCV oil trap? Or did you add it to the engine oil? If you put it down the PCV hose than why would you have to change the oil? Also how long did you let the Seafoam sit? Thanks
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