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Smoke when letting off throttle

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
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Jrhale00
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Smoke when letting off throttle

Post by Jrhale00 » Wed Jun 03, 2020 10:35 pm

Hi I have a 1998 s70 glt that I put a motor in that has 113k on it I also put a rebuilt turbo in it out of a t5 at the same time the car runs fine and idles fine I also got a tune through vast tuning, whenever I accelerate and hit between 8 and 15 pounds of boost and then lift off the throttle it smokes and smells like oil, it doesn't have that sweet smell of coolant I've looked through the forums and can't find anything related I'm pretty sure it's either valve stem seals or the turbo one guy I've talked to says valve stem seals and the other said the turbo please if anyone has any advice on this let me know

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Re: Smoke when letting off throttle

Post by Sveedy » Thu Jun 04, 2020 5:19 pm

Far from an expert, but I'd be looking at the PCV system first.
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Re: Smoke when letting off throttle

Post by Jrhale00 » Thu Jun 04, 2020 5:37 pm

Pcv systems been replaced withing 20k miles

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Re: Smoke when letting off throttle

Post by misha » Thu Jun 04, 2020 5:58 pm

113k is a bit low for valve stem seals,but it also depends was the engine abused and was it maintained regularly.
Could be a turbo too.
If smoke is blue...it's the oil.
If it's black...it runs rich.
If tune wasn't done properly it could damaged the rebuilt turbo.
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Re: Smoke when letting off throttle

Post by scot850 » Thu Jun 04, 2020 7:29 pm

+1 with misha on this one. 113k is a low mileage, but then the engine is at least 20 years old and rubber hardens with age and infrequent oil changes.

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Re: Smoke when letting off throttle

Post by abscate » Thu Jun 04, 2020 7:36 pm

Come down a long hill, like 2 km or more in 3rd gear, and mash it at the bottom.

Lots of blue smoke means stem seals
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Re: Smoke when letting off throttle

Post by Jrhale00 » Thu Jun 04, 2020 8:05 pm

Doesn't smoke when accelerating only smokes when letting off on throttle after a higher boost pull I also got a check engine light today with the codes p0445 and p0245

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Re: Smoke when letting off throttle

Post by Jrhale00 » Thu Jun 04, 2020 8:06 pm

Doesn't smoke when accelerating only smokes when letting off on throttle after a higher boost pull I also got a check engine light today with the codes p0445 and p0245

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Re: Smoke when letting off throttle

Post by scot850 » Thu Jun 04, 2020 11:31 pm

P0445 is a common emission fail code. Lots of info here about it.

P0245 is a ECM error code pointing to the turbo wastegate error. I saw someone had this error and it was traced to the TCV valve having a hose disconnected. Check the TCV is connected correctly and the electrical wire and connector are good.

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Re: Smoke when letting off throttle

Post by RickHaleParker » Fri Jun 05, 2020 1:09 am

Does it smoke on initial start up? After it has sat overnight have somebody else start it as you stand behind the car and watch the tail pipe for smoke. If it does smoke, observe the color and smell.
--------
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
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