2012 GT struggling on cold start. - Mustang Evolution

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Old 09-18-2014, 02:14 AM   #1
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2012 GT struggling on cold start.

Every once in awhile my mustang, with 45K miles, has trouble cranking. The symptoms include a longer crank duration than my normal and more common ones. After it does crank, the RPM needle shakes rapidly below 0 RPMs before going up to normal crank range. This has occurred on both level and angled ground. I have had more than a half a tank of gas during all but one occurrence. With 45K miles I'm wondering if there is a component i should replace or upgrade? I bought her with 41K. It also seems to be happening more often lately as well. ANY help is much appreciated. Thanks you.
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Old 09-18-2014, 02:19 AM   #2
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Check battery?

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Old 09-18-2014, 07:42 AM   #3
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New plugs and sea foam to start with.



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Old 09-18-2014, 09:04 AM   #4
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Plugs shouldn't need to be changed @ 45,000 miles and seafoam is certainly not the answer.

And it wouldn't be the battery if it was cranking just fine.
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Old 09-18-2014, 09:49 AM   #5
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Have you run a diagnostic, no error codes or anything out of the normal? Double check you battery terminals and your Ground cable...Autozone will do a free battery/alternator check for you. Also check your coil packs make sure there are no loose or wet connections. I'm just throwing ideas of what it might be... Hope this helps...
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Old 09-18-2014, 10:06 AM   #6
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This isn't exactly the same, because I'm speaking about a '99 camry. However, it had the exact same issue you are describing and it was spark plug related, although in my case it ended up being the wiring and not the plugs.
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Old 09-24-2014, 04:39 PM   #7
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2012 GT struggling on cold start.

To anyone who was curious, turns out it was the battery. They performed tests that resulted in 0 cranking amps compared to the normal 590 on the stock battery. A new battery is in and everything is just fine. Thank you all for the input!
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