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Is this Oil or Fuel smoke?

This is a discussion on Is this Oil or Fuel smoke? within the Computer & Tuning forums, part of the LSx Technical Help Section category; Its hard for me to tell, the car had been running for at least 10 min cuz i too, it ...

  1. #1
    Senior Member ss~zoso~ss's Avatar
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    Is this Oil or Fuel smoke?

    Its hard for me to tell, the car had been running for at least 10 min cuz i too, it for a drive around a few streets so it was defiantly warmed up, so here's the vid please let me know what you think, i hope its not oil but idk....

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    Member Fran D's Avatar
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    Looks blue enough to be oil, unless it's somehow being tinted by the color of the car in the video. Does it look like a slight blue tint to you in real daylight?

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    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    I agree.. bad angle... are you losing oil? Is the car tuned?
    -Geno
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    Nitrous Tuner LS2Tuner's Avatar
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    Yeah it looks to be bad valve seals and or guides.


    You notice how the strong puff comes after you let off the throttle.....?

    When you back off the throttle that causes the vacuum to spike and go high so if the guides have excessive wear clearance it will always smoke when you let off the throttle.

    What weight oil are you running?
    Are the heads tired?
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

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    Senior Member ss~zoso~ss's Avatar
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    SS: NBM, tan top
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    idk if the heads are spent or any of that its only got 73k on it, i got 5w30 royal purple in it, but the fuel in it is also old and there's like 32 oz of fuel stabilizer in there too

    i've never noticed any oil consumption what so ever before i put it away for the winter, so i would have to say it shouldnt be anything permanent? idk, this scares me a bit, it did look blue to me tho

    do you think the fuel stabil and old gas might have anything to do with it?

    and the car is not tuned either

  6. #6
    Senior Member ss~zoso~ss's Avatar
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    SS: NBM, tan top
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    also if you look again, it smokes right when i hit the gas not after, i considered what you said and it looks as tho it smokes right when i give it gas

    please keep the info comin

  7. #7
    Member Fran D's Avatar
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    You could also check the PCV valve and see if it's hung open. I know that the '98s had a different PCV routing than the following years, but I honestly don't know if that would make them more susceptible to pulling oil. I remember in the early days of these cars, guys were yanking the PCV and just running filters on the tube as a crankcase vent.

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    Senior Member ss~zoso~ss's Avatar
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    eh i could check it, the current pcv has like 9k miles on it. i'm thinking it might be fuel tho, my battery went dead and it had only been running 10 min or so after i charged it, so i assume it'd run in safe / base mode, which would be rich so that no harm would be done, plus the fuel stabil in the fuel, idk...

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    Rice Hungry GottaHaveLS1's Avatar
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    hmmm, it does look a little blue. hopefully its not a big problem. the car sounds alright.... how does it run? maybe a tune would help. that's what i'm doing this spring

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    Just another Joe Eagle's Avatar
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    Quote Originally Posted by LS2Tuner View Post
    Yeah it looks to be bad valve seals and or guides.
    Rebuild your heads and it'll go away.

    -Eagle

  11. #11
    Senior Member ss~zoso~ss's Avatar
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    SS: NBM, tan top
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    ^ ok i'll get right to that, once its back on the road again i'll take another vid and see if it is still doing it

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    Nitrous Tuner LS2Tuner's Avatar
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    I have seen heads come in the shop that have under 50,000 with brittle ass valve seals. I think alot of it has to do with the oil used and driving habits.
    When it is a city commuting car and doesn't really get up to temp in the majority of driving cycles it builds up contaminates in the oil and the valve covers that over time are damaging to gaskets and seals.................... No telling unless you had bought it new and knew the total history.

    How much of that gas is in it? I would have a nice sale to a friend and get that shit out and fresh in with a nice oil change after the storage. And please if you don't do this already do your motor a favor and change the oil when it's hot NOT cold and God forbid NO FRAM FILTERS!!!

  13. #13
    Senior Member ss~zoso~ss's Avatar
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    SS: NBM, tan top
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    yea when spring comes and its back on the road i'll change the oil and get rid of the gas, you think it'd hurt it if i burned the gas? The oil also only has like not even 1000 miles on it, and its a full synthetic...

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    Nitrous Tuner LS2Tuner's Avatar
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    Quote Originally Posted by ss~zoso~ss View Post
    yea when spring comes and its back on the road i'll change the oil and get rid of the gas, you think it'd hurt it if i burned the gas? The oil also only has like not even 1000 miles on it, and its a full synthetic...
    No it wouldn't hurt I'd have to say it just wouldn't be optimum. To just drive it it will be ok. To go out and beat the shit out of it would be bad due to the lack of octane from being old and moisture gets absorbed. You knock sensor should take care of it and retard to the timing.
    As for the oil I would change after putting a 100 miles or so on it.

  15. #15
    Senior Member ss~zoso~ss's Avatar
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    SS: NBM, tan top
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    so ya still think its oil tho huh?....

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    Nitrous Tuner LS2Tuner's Avatar
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    Quote Originally Posted by ss~zoso~ss View Post
    so ya still think its oil tho huh?....
    Yeah just cause of WHEN it smokes.

    If it was just the fuel the motor would smoke under acceleration. It comes right after when the vacuum is highest and draws the oil in. You understand my theory?

  17. #17
    Senior Member ss~zoso~ss's Avatar
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    when do you think it smokes, to me it seems it smokes right as i hit the gas, you were saying it was after i hit the gas...

    and if it was oil wouldn't it smoke always

  18. #18
    Nitrous Tuner LS2Tuner's Avatar
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    Quote Originally Posted by ss~zoso~ss View Post
    when do you think it smokes, to me it seems it smokes right as i hit the gas, you were saying it was after i hit the gas...

    and if it was oil wouldn't it smoke always
    It's delayed. As the rpm is going back to idle it seems to smoke. Which is when the throttle blades shut the vacuum spikes. Which causes the oil to be sucked past the seals and or guides.

  19. #19
    Senior Member ss~zoso~ss's Avatar
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    SS: NBM, tan top
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    i'm not disagreeing that what your saying is incorrect (about vacuum and that stuff) but after watching the vid 10+ times , i am positive it is not delayed, that the smoke is produced when i hit the gas, this is how i know: when ever i let of the gas at all , you can hear the "back pressure" or what ever you call it, its the really garggly / chopy part of the exhaust note, the smoke comes out before the sound, which leads me to believe that the smoke is being produced when the throttle is increased

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