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Author Topic: Smoking after engine braking  (Read 1749 times)

Offline Elmo2002

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Smoking after engine braking
« on: May 05, 2020, 06:05:47 pm »
Hi all, not sure if this is the right section to post in but I thought it would be a start. I have a 2012 abarth 500 that has just developed an interesting feature.
After a period of engine braking when you just start to accelerate again it throws a plume of bluish smoke out of the exhaust. I initially thought this may be the pcv system so have taken a look and all seems to be fine. I have checked the boost pipes up to the inlet manifold and there is no sign of oil in them. I have taken the plugs out and they seem perfect even just after the event so don't think I am getting blow by from the rings or the valve steam seals (also no blue smoke on start up after being left for days).
Does anyone have any other suggestions or have experienced similar? I will try and post a video that I managed to catch of it

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    Offline 124Abarthreplica

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    Re: Smoking after engine braking
    « Reply #1 on: May 05, 2020, 06:16:17 pm »
    Hi and welcome to the forum :thumb:

    Oil level too high?

    Offline Elmo2002

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    Re: Smoking after engine braking
    « Reply #2 on: May 05, 2020, 06:55:01 pm »
    Hi, no it's quite near the bottom of the dipstick. I have just removed all of the pcv system, blanked off and taken for a drive and it's still the same

    Offline Elmo2002

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    Re: Smoking after engine braking
    « Reply #3 on: May 05, 2020, 07:30:59 pm »
    Have also noticed that in sport mode it's only making just over 0.8bar boost, 1 bar at max I'd say

    Offline Elmo2002

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    Re: Smoking after engine braking
    « Reply #4 on: May 05, 2020, 08:13:43 pm »
    Hi and welcome to the forum :thumb:

    Oil level too high?
    Thanks for the welcome as well

    Offline shadyracer

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    Re: Smoking after engine braking
    « Reply #5 on: May 05, 2020, 09:24:42 pm »
    Have you looked inside the pipe from airbox to turbo? The 60mmish diameter hose, could be start of turbo seals expiring if excessively oily in there.

    Offline Elmo2002

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    Re: Smoking after engine braking
    « Reply #6 on: May 05, 2020, 10:26:10 pm »
    Have you looked inside the pipe from airbox to turbo? The 60mmish diameter hose, could be start of turbo seals expiring if excessively oily in there.
    All of the intake pipes are clean. Could it be a turbo seal starting to go allowing oil to leak straight into the exhaust? I would say there is around 2mm of end float movement on the turbo shaft

    Offline Elmo2002

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    Re: Smoking after engine braking
    « Reply #7 on: May 05, 2020, 10:29:50 pm »
    Managed to upload a video. It is normally worse then this but best I could do.
    https://m.

    Offline shadyracer

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    Re: Smoking after engine braking
    « Reply #8 on: May 06, 2020, 07:25:33 pm »
    Doesnt look good, next id check intercooler to see how oily , possible seals are going, endfloat can be same on good working turbo unit, id also check compressions to assert facts before replacing anything. Good luck

    Offline Elmo2002

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    Re: Smoking after engine braking
    « Reply #9 on: May 07, 2020, 08:33:26 am »
    Doesnt look good, next id check intercooler to see how oily , possible seals are going, endfloat can be same on good working turbo unit, id also check compressions to assert facts before replacing anything. Good luck
    Have taken off IC pipes and there is no sign of and oil what so ever.

    However last night I engine braked to a set of traffic lights, had a pause of around 30 seconds wilt they were red. Then on pulling away had the cloud out the back. If it were rings or stem seals would the oil sit for that long until the revs came up?

    Offline shadyracer

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    Re: Smoking after engine braking
    « Reply #10 on: May 07, 2020, 12:05:57 pm »
    Id say yes, I had a non turbo subaru legacy did exactly same as you described when sitting idling in traffic, it had worn piston rings but had near 200k on clock. Id do cylinder compression test next.

    Offline Elmo2002

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    Re: Smoking after engine braking
    « Reply #11 on: May 07, 2020, 12:33:00 pm »
    Getting a compression test done later. I seriously hope it's not rings as the car on has 52k on the clock

    Offline Elmo2002

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    Re: Smoking after engine braking
    « Reply #12 on: May 07, 2020, 08:41:47 pm »
    Id say yes, I had a non turbo subaru legacy did exactly same as you described when sitting idling in traffic, it had worn piston rings but had near 200k on clock. Id do cylinder compression test next.
    Compression test carried out, 3 time on each cylinder cranking for around 8secs. Results were 190psi across the board within 2psi

    Offline StephenABC

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    Re: Smoking after engine braking
    « Reply #13 on: May 07, 2020, 08:55:33 pm »
    I had a zafira gsi,. My other problem turned out to be stem seals.

    Offline Elmo2002

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    Re: Smoking after engine braking
    « Reply #14 on: May 07, 2020, 09:22:33 pm »
    I had a zafira gsi,. My other problem turned out to be stem seals.
    Did it smoke on start up at all? As been told by a couple of local garages that this would be a sign.