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puff of smoke on occasion when first starting engine.

Thread in 'General Information' started by Jerry G., Mar 13, 2020.

  1. Jerry G.

    Jerry G. Active Member

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    I have a 2007 ST with 93,000 miles .I am currently using a full synthetic oil . Sometimes when I first start the engine a puff of smoke comes from the tail pipe . It may happen twice in a week or once in a month . That Is the only time I see smoke .Its not a lot of smoke just a puff then it goes away and no more . It is not using oil . Usually thats a sign of valve seals leaking a little but it does not do it often . Anyone have this same experience ?
     
  2. EddieS'04

    EddieS'04 Well-Known Member 1st Gen Owner 2 Wheel Drive V6 Engine

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    If you dont suspect valve stem seals. What about the ECU, might be too rich on fuel @ startup. Or a seeping injector.
     
  3. Jerry G.

    Jerry G. Active Member

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    yeah didnt think that . thats a possibility . Thanks
     
  4. carlthess40

    carlthess40 Member

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    Hook up a fuel pressure gauge to the fuel rail
    And start the engine, let it run for a few seconds, just until the pressure is stabilized
    Then turn the engine off, you should only lose maybe 1 or 3 lbs of pressure, if you lose anything over 5LBS in under 1 hour, then you could have a leaking injector and the only way to figure out which one, is to pull the whole fuel rail out with the injectors and pressurize them and watch and see which one leaks


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  5. Jerry G.

    Jerry G. Active Member

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    ok thanks for your reply . I will hold on to this .
     
  6. Jerry Acheson

    Jerry Acheson Member 2nd Gen Owner 4 Wheel Drive V8 Engine

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    I wouldn't rule out valve seals. You may not always see the smoke, particularly if you're looking for it through your mirrors. It doesn't take much oil to create a puff of smoke and the seals could be in an early stage of failure.
     
  7. carlthess40

    carlthess40 Member

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    I never have any smoke from my 2002 ST and it has 150,00 miles with the v6 4.0
    I did when I first got her and the former owner used synthetic oil and I switch to regular oil 5w40 and no longer have smoke
    I would try changing to regular oil for one time and see if the smoke goes away
    Synthetic oil is a great cleaner and really doesn’t do anything to help seals to stay soft
    I know this for a fact, as I’m a retired/ disabled master tech of 40 plus years
    Working on everything from fords to million dollar show cars and rebuilding and maintaining massive power plant motors for Large machinery. With synthetic oil it will find any and all leaks and hard seals and show the signs of old and warn seals
    Just give it a try, it will not hurt your engine
    The tails of ( you can never change from regular oil to synthetic or synthetic to regular oil are uneducated rumors )


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  8. Jerry Acheson

    Jerry Acheson Member 2nd Gen Owner 4 Wheel Drive V8 Engine

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    My only experience with bad valve seals was a Chrysler 400 lean burn using Mobil 1 synthetic oil.
     
  9. Jerry G.

    Jerry G. Active Member

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    Thanks for the info . Its funny because I was just thinking about dumping this synthetic oil and replacing with 5x20 and no synthetic . Maybe my ST with 93,000 is too much for full synthetic . We will change this out and see what transpires . PS I'm retired also and I can do my oil changes yet but I'm limited at 75. Have a good summer.
     
  10. EddieS'04

    EddieS'04 Well-Known Member 1st Gen Owner 2 Wheel Drive V6 Engine

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    My last oil change was a switch to Mobil 1. I now have a valve cover leak onto exh-manifold. The Penzoil plat syn, did not leak.
     
  11. Jerry G.

    Jerry G. Active Member

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    OMG! There is a slight chance the gasket was ready to go . I would hesitate to blame the oil . YET! Either way I know your frustrated . Hang in there my friend .
     
  12. carlthess40

    carlthess40 Member

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    Like i said, Full synthetic oil will make a small seepage turn into a leak, full synthetic is excellent for keeping the inside of the engine clean regular oil will allow dirt to clog up any gaskets that may be leaking and just look a little wet but when you switch to synthetic it will clean it and cause it to leak


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  13. Todd Z

    Todd Z Well-Known Member 2nd Gen Owner V6 Engine V8 Engine

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    What color is the smoke ?? it could simply be condensation burning off...
     
  14. Jerry G.

    Jerry G. Active Member

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    Thats what I have heard . That is the down side of full synthetic . It will leak where most other conventional wont . I will be changing this out very soon . Common over I've had some beer in the fridge for over a year LOL we can talk about it some more .
     
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  15. Jerry G.

    Jerry G. Active Member

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    sorry, I didn't see your comment. Its blue . I have conventional oil and will be replacing the synthetic with that.
     
  16. Jerry G.

    Jerry G. Active Member

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    I have heard full synthetic will leak where conventional oil will not (Eric the car guy) so maybe thats what mine is doing . I will find out as soon as I change it .
     
  17. Jerry Acheson

    Jerry Acheson Member 2nd Gen Owner 4 Wheel Drive V8 Engine

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    You're in the right church, blue is oil.
     
  18. Jerry G.

    Jerry G. Active Member

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    never heard that expression before but I like it . LOL I have the new oil waiting on the filter to come then the test will begin .
     
  19. carlthess40

    carlthess40 Member

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    One other major problem that has played forwards with the plastic Plenum and intake systems. If you do not maintain the PCV valve‘s properly and excessive amount of oil wall cumulate inside of the Plenum which is the top part of the intake, you can remove the throttlebody and take a long screwdriver with the rag attached to it and stuff it inside there and push it towards the bottom. And when you pull it out, The rag will have oil on it ,so that is also another possibility that the Plenum has an excessive amount of oil buildup inside of it


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  20. Jerry G.

    Jerry G. Active Member

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    Thanks buddy . I am changing my oil from full synthetic to conventional oil first . Then see what happens . I have 93,000 miles on my 07 that might be too many miles for my full synthetic ,Ill see soon . We dont drive the ST too much at all so a little time shouldn't hurt . If it still happened after the other oil is in there your suggestion is next . I will also research changing the PCV valves . I'm getting where its getting hard to do these things as I myself could use an over haul LOL.
     

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