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  1. #1
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    1 out of 1 members liked this post. Yes Reputation No

    N54 smoke when deceleration

    Hi guys after downpipe install and sec cat remove
    When deceleration car start to smoke just like is on fire
    Sometimes is smoke, sometimes nope..
    Turbos is clean no oil ..
    No pcv upgrade
    No oil catch can ?
    Smoke is white blue
    Car run like beast
    Attached Images Attached Images  

  2. #2
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    Usually Valve Stem Seals is the issue, Can also be PCV.

  3. #3
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    "car run like beast" lol
    Cadillac V2 CTS-V - 6MT - Lingenfelter upper pulley, Airaid CF Intake, Magnaflow exhaust, fluidyne H/X

    Honda S2000 AP1 - White on red - 9000rpm vtec bruh

    Porsche 991.1 PDK

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    If is valve steam will make only when is cold
    Car smoke only warm

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    2 out of 2 members liked this post. Yes Reputation No
    Install secondary cats and problem solve. Had this same issue.
    335is. MMP ball bearing turbos. JB4, Phoenix Race FMIC, VRSF Inlets, MMP rubber outlets, VRSF DP, VRSF CP with Tial BOV, SSP clutches. Tuned by Trebila. 719 whp @28 psi. 93 octane + MPI

  6. #6
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    its almost NEVER valve stem seals, and typically your aging turbos. Just throw it in neutral on deceleration bro - problem solved

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    Its auto bro

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    Keep in mind, the intake manifold vacuum is very strong in gear on decel, so oil vapour will get sucked into the intake.
    If your PCV is faulty in some way, you will get huge clouds on this occasion.

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    I had this problem when I went no cats. Blocked internal pcv, went to external PCV with inline (in PCV line) catch can. I have not seen any smoke in a while, used to be clouds at stops when driving in the 1300 rpm area. I'm sure there is still a little smoke if your behind the car, but I don't see any from inside the car. I also went to Redline oil thinking an Ester based oil would smoke less.

  10. #10
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    I also went external RB PCV (with blocked head ports) and it reduced my smoking as well.
    It still smokes once in a while, but i think my turbo seals are toast..

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    Had the exact same issue, only would happen on hot decel. At first I thought valve stem seals, but it turned out to be the turbos

  12. #12
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    Click here to enlarge Originally Posted by noorj Click here to enlarge
    Had the exact same issue, only would happen on hot decel. At first I thought valve stem seals, but it turned out to be the turbos
    I can't count the number of threads like these over the years where it ends up being the turbos. I think most guys post hoping that it isn't the turbos when deep down they know they will have to replace them.

  13. #13
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    yeah either the guys whose car it is or the $#@!ty turbo manufacturers on our platform

  14. #14
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    Address cheaper and easy PCV stuff (valve cover, gasket, valve, vent hose). Still problem? Turbos.

    If you want some peace of mind you can do a leak down test of the engine as well, but judging by that pic those look like some mangy old turbos with a ton of crud built up on the turbines so theres is 99+% chance those turbine seals have lost all ductility as well (still do PCV first as you want it in good health for new turbos once installed).

    Thanks,
    Rob

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    I have over 149,000 miles so I suspected it was turbos. I pulled the downpipes and you can see the front turbo is leaking oil into the exhaust. I resigned myself to turbos, bought wastegate and rebuild kits. But the whole, only really bad after driving at RPM near 1300 just didn't make sense for turbos. I suspect it is the highest manifold vacuum RPM while driving at steady speeds. So I did the external PCV with inline catch can and I can't remember the last time I saw smoke and I have 0 cats, 3" catless DP's and replaced the rears with resonators. If I win some turbos, I will pull the valve cover and block the ports for the PCV in the head. I have not rebuilt the turbos yet as the lack of smoke makes it seem like less of an issue. Before the external PCV you could just keep the RPM at 1300 in neutral (not easy to do, doesn't want to hold that RPM) and it would just start smoking like a forest fire.

    So, If you verify the smoke is after a long steady speed around 1300 RPM, try the external PCV and block the factory one off. RB sells all the parts you need. (RB = Rob Beck Turbos)

    Also mine is automatic transmission.

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    Mate
    So after pcv change stop smoking ?

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    Faulty PCV's can generate a lot of stupid issues (including giant clouds of smoke).
    I however also had oil consumption (1L/2000km) and i thought this was relative to the smoking.
    When i went RB external, the smoking stopped, however the oil consumption didn't.
    I still have a light smoke on some occasions, but this is only when the car is cold and i have no kitty's.
    At this point most people hope it's still something in the PCV (or something else), but it's pretty obvious my turbo's needed replacing.
    80k miles on them and running pretty hard on them, it's a good opportunity for me to upgrade to PS2's Click here to enlarge

    Good luck

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    Just putting the cats back on isn't solving the issue here, you need to find the real issue first...

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    Click here to enlarge Originally Posted by Yamahar1 Click here to enlarge
    Mate
    So after pcv change stop smoking ?
    Yes it quit smoking after pcv change. I can tell you one way to know for sure if your problem is PCV related, before modifying my PCV the oil cap always had white foam/froth on it. After PCV modification, the oil cap is always free of any white foamy stuff.

    The turbos cannot drain properly if the crankcase is pressurized. Ultimately anyone with a tuned N54 should tap and block the pcv ports in the cylinder head and go to external pcv with catch can, also catch can on crankcase vent hose. The factory pcv is designed for a car with 6-8 pounds of boost.

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