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  1. #1
    Join Date
    Jan 2005
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    Chandler, AZ
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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
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    330
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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
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    Chandler, AZ
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    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.



  4. #4
    Join Date
    Jul 2009
    Location
    so cal
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    169
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    Just to add another, "possibility", I had swapped out both the Cam and Crank sensors to no avail. I let it go as an anomaly on hot days or my car was just possessed lol. Anyway, just recently I kept getting a P0301 (Cylinder 1 misfire). Swapped all plugs first and it came back within 3 days. Next, I put in a new Coil pack on Cylinder 1 with the same results. Finally, I purchased a "rebuilt" OEM fuel injector for said cylinder. Swapped it out and as soon as it started I could tell the car was idling better and without a foul raw gas smell from the exhaust like before.

    Back to the long crank issues, well, it has yet to happen again. I suspect the fuel injector in cylinder 1 had been slightly faulty for some time and was not initiating the startup correctly. It makes sense as that is the first cylinder to fire off and if it is not on point, it kinda goes downhill from there until the next loop sequence.

    Not saying this is your issue, but I like putting small occurrence like this on here as it tends to help others whom may relate and in turn be useful down the line. I know I've found numerous helpful threads the same way. That's the reason I love this forum, it's chalk full of helpful info and members
    Likes BryGuy liked this post

  5. #5
    Join Date
    May 2011
    Location
    Markham, Ontario
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    Quote Originally Posted by Brian_R170 View Post
    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.
    Some people have had lousy outcomes with aftermarket sensors. Sometimes, factory is the best choice. Any chance fuel could be bad quality?

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