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Thread: Weather Temp Swings Cause Engine Problems?

  1. #16
    Join Date
    Sep 2010
    Location
    Livonia, Michigan
    Posts
    569
    I did some Google-fu on this one and came up empty. Some people have tracked down long cranking times on the Pentastar 3.6 to camshaft sensors but their starting problem was consistent in all temperatures.

    Couple things come to mind that no one else mentioned, one is an injector that's leaking. When you start you would have 1 flooded cylinder and 5 starved ones.

    The other off the wall thought is winter-summer fuel. Could you be running winter gas that's causing a vapor problem when it gets warm? Possibly a different brand of fuel might make a difference. It's a slim chance on that but doesn't have much cost.

    If you have an EVIC on your truck look at the temperatures of the sensors before you start. Look for something that's out of line. A temp sensor could be a bit out of whack.

    -Tom

  2. #17
    Tom,
    Thanks for digging. I have a OBD-II reader (in addition to the info the dash screen displays) and I didn't think about flipping through the readings ahead of time to see what is out of whack. I have a feeling it'll take a few times for me to gather much more information on this issue, but I'll try and keep the thread updated.
    Licensed Professional Engineer
    G0766 / SO2 CNC with Aspire 8.0 / All 10 Fingers So Far

  3. #18
    Join Date
    Sep 2016
    Location
    Modesto, CA, USA
    Posts
    1,180
    Turn key to run position and listen for the fuel pump to build pressure then shut off, should take 3-5 seconds. Next turn key to start position.
    Also you may be using the wrong gas as in spring and fall winter/summer gas could be wrong gas for todays weather. Not much you can do about that.
    Bil lD

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