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Puff of smoke after idle... is that likely valve stem seals or turbo?

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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clarkerussell
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clarkerussell

Puff of smoke after idle... is that likely valve stem seals or turbo?

Post by clarkerussell » Fri Apr 26, 2019 9:20 am

Hello all,

After replacing the PCV system on my 1998 S70 GLT I noticed that the smoking issue after long idle is MUCH less pronounced than before. Now, after about 5 minutes of idle, I get a little puff of blue smoke when I rev the engine to ~3000 RPM, but not some huge cloud. For reference, I had pretty severe positive pressure at the oil fill cap before the fix, now I have good negative pressure...

So, my question is if smoke at idle is typically a condition of failing valve stem seals, or is it equally likely to be turbo related? REALLY hoping it's turbo related as that seems like the quickest fix, but didn't want to waste the $$$ if there is no chance that's the issue.

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RickHaleParker
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Re: Puff of smoke after idle... is that likely valve stem seals or turbo?

Post by RickHaleParker » Fri Apr 26, 2019 9:47 am

Puffs of blue smoke at startup and after idling are symptoms of valve stem seals.
ATP Re-Seal Additive AT-205 might buy you some time, could buy a lot of time. I get mine at Advance Auto Parts.
--------
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, B8444S TF80 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger. V8 conversion in progress.

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clarkerussell
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clarkerussell

Re: Puff of smoke after idle... is that likely valve stem seals or turbo?

Post by clarkerussell » Fri Apr 26, 2019 11:10 am

Thanks for the confirmation, that's what I was assuming.

I just placed an order with Amazon (through the link!!!) and it'll be delivered tomorrow. We'll see how it goes!

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erikv11
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Re: Puff of smoke after idle... is that likely valve stem seals or turbo?

Post by erikv11 » Fri Apr 26, 2019 12:54 pm

What Rick said, all of it. Good luck!
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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