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Thread: white smoke when start up

  1. #1

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    1990 Mitsubishi Mighty Max
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    white smoke when start up

    hey can anyone give me any idea what could be wrong or is this is a normal thing

    i got white smoke coming out when i start my truck its a 1990 mighty max but with in 5 to 10 mins its gone

    i jsut bought it and got it cheap because of the smoke but did i make a great buy or break out even due to repairs

    the truck has also been sitting for a while and i changed the oil/tranny fluid/ cap rotor wires and plugs/ and flushed the coolent

  2. #2


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    what does it smell like?

  3. #3

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    Its Dont smell like oil but oil is leaking from back exhaust manifold area and water is coming out the exhaust too
    Is it head gasket or rings you think

  4. #4



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    Sounds like head gasket, because rings don't get in contact with water unless you cracked something, like a block or head ...have you done a compression test yet? Also sometimes the half moon rubber grommet at back of head and valve cover can leak and look like the area you mentioned is leaking.
    Steam or water in exhaust in quantity is a head gasket. Typical Mitsubishi and hopefully you didn't crack the head. Time for a new gasket and get head shaved to a flat surface at local machine shop.

  5. #5



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    Most likely head gasket. White smoke means water and blue smoke means oil usually
    Josh
    09 BMW 335i E92 Twin turbo
    89 Macrocab 4g63 Turbo swapped & Bagged: Build Thread

  6. #6

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    thanks guys got me a weekend project now

  7. #7


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    you may be just fine, if the "white" smoke goes away after its warm, then it's just normal warmup, water out the tailpipe is the product of excellent combustion (chemistry) which fuel injection is famous for. If the smoke smells like antifreeze, then it's a head gasket.

  8. #8

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    when i bought it 2 weeks ago it went away but now its steady so im just going to test it then change all the gaskets and belts and everything while i got it apart it has 151684 on it right now so if i got to go and tear it all apart might as well change everything else and freshing the whole motor

  9. #9


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    151k is barely broken in! full factory gasket set P/N is MD997168 include everything down to the valve stem seals.

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