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  1. #1
    Join Date
    Jan 2005
    Location
    Chandler, AZ
    Posts
    133
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    Occasional long crank times during startup

    My 2009 300 w/ 2.7L and only 32K miles occasionally takes about 3 seconds of cranking before it fires up, and a couple of times it has coughed and nearly died.

    This seems to happen mostly when I get in the car to come home from work in the afternoon on hot days (105F+). The car has been sitting for up to 9 hours. It happened less than once a week last summer, but seems to be 2 or 3 times a week now.

    I've tried turning the key to the "ON" position for 3 seconds before turning to the "START" position to engage the starter to give the fuel pump so time to build pressure, but it doesn't seem to make a difference.

    I had a nearly identical problem in my '96 Grand Cherokee that turned out to be the IAC valve which wasn't reacting fast enough until the engine warmed up. Of course, it finally left me stranded somewhere before I fixed it.

    I want to get it diagnosed before it becomes a real problem. Any ideas? CPS or TPS, maybe?
    Brian
    '09 300 Touring 2.7L
    '02 Mercedes SLK32 AMG
    '96 Jeep Grand Cherokee Laredo V8

  2. #2
    Join Date
    Sep 2009
    Location
    Jersey City, NJ
    Posts
    325
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    This tends to be related to the crank sensor. Happened to mine last year. Can also be the cam sensor. Both are cheap parts and fairly easy to replace. The other culprit could be the fuel pump.

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  3. #3
    Join Date
    Jan 2005
    Location
    Chandler, AZ
    Posts
    133
    Post Thanks / Like
    Thanks! Looks like I can get aftermarket replacements for around $25 for the pair. I'll change them and see what happens. Fingers crossed that it isn't the fuel pump.



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