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Rough start

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Old Nov 24, 2017 | 05:58 PM
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From: Clinton Twp MI
Default Rough start

Car sat in the garage about 5 days since last start. Exterior temps in the 30s overnight. About 45 in the garage.

Started car today and it ran VERY rough for about 90 seconds and sounded very odd...almost as if all cylinders were not firing. Then, all of a sudden, it began to run/idle fine. Ran some errands and it ran fine and started normally each time.

Never experienced this before. Any ideas?

Thanks
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Old Nov 24, 2017 | 07:55 PM
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Originally Posted by javenius
Car sat in the garage about 5 days since last start. Exterior temps in the 30s overnight. About 45 in the garage.

Started car today and it ran VERY rough for about 90 seconds and sounded very odd...almost as if all cylinders were not firing. Then, all of a sudden, it began to run/idle fine. Ran some errands and it ran fine and started normally each time.

Never experienced this before. Any ideas?

Thanks
I just traded in a nearly identcle car. Only diff 2LT and Silver. You don't see many Z51 MN7 convertibles. Now have a silver coupe.
As far as your issue, I'm thinking fuel. Do you use 91 e0 only? No ethanol.
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Old Nov 25, 2017 | 10:07 AM
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Originally Posted by Jeffthunbird
I just traded in a nearly identcle car. Only diff 2LT and Silver. You don't see many Z51 MN7 convertibles. Now have a silver coupe.
As far as your issue, I'm thinking fuel. Do you use 91 e0 only? No ethanol.
Last fill was Mobil 93 Octane w/Ethanol. Same as I having been using since I bought the car new in 2015. We are still having some mild weather so I'll run it over the next few days and refill just in case I got a little bad gas.

Taking it in next week for the Mag Ride re-calibration. Will have the dealer check the spark plug connections, check for any internal error codes, etc.

I see you are an update New Yorker. I grew up outside of Rochester and boated on Canandaigua Lake as a kid. Beautiful country!

Jim
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Old Nov 25, 2017 | 01:18 PM
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Car doesn’t like sitting! Gets pissed if it doesn’t move every couple of days.
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Old Nov 25, 2017 | 01:30 PM
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Jim, I betting it was just a fluke occurrence. At times mine will take longer to start when it has sat awhile, and will get a little shaky when cold. Now, if yours does it every time I would suggest you take her to the dealer as I wouldn't think that is normal.
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