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Misfire codes on a new Cayman S


peter_moy13

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Hi everyone,

New Porsche owner here and I'm a little worried about an issue that popped up with the car this weekend. The Cayman S is new with only 700 miles. It was parked outside in the driveway under a car cover with a battery maintainer but with 1/2 a tank of gas. Due to work, it sat for 8 days in some cold temps in NY (22 degrees over night).

So Sunday morning I went for a drive. The air was humid, 38 degrees F and there was a slight mist falling. About 10 miles into a highway run @ 60 MPH, the flashing check engine light came on. I immediately looked for a safe place to pull over and took the next exit (< 1 mile). Pulled into a gas station and noticed the engine was running very rough. By this time the light had turned solid.

I filled up the tank (7 gallons) and restarted it. Everything returned to normal at this point. The light was out and it was running smoothly. Drove around another 25 miles with no issues.

Took it to the dealer the next day and they read codes P0300 and P0301, P0302 and P0303. They pulled the spark plugs and checked around by saw nothing unusual. I'm a little concerned that everything happened on one bank.

The SA recommend I warm the car up more before moving and to keep an eye on things. I've put another 150 miles on the car since without any issues, but I still can't shake this nagging concern. Searched this site had provided more details on possible causes of these codes but most of these cars are way past the break-in stage. What can cause this to happen on a new engine? Did I shorten the life of the CATS because I had no safe area to pull over?

Any thoughts on this or should I just learn to relax?

-pete

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Hi everyone,

New Porsche owner here and I'm a little worried about an issue that popped up with the car this weekend. The Cayman S is new with only 700 miles. It was parked outside in the driveway under a car cover with a battery maintainer but with 1/2 a tank of gas. Due to work, it sat for 8 days in some cold temps in NY (22 degrees over night).

So Sunday morning I went for a drive. The air was humid, 38 degrees F and there was a slight mist falling. About 10 miles into a highway run @ 60 MPH, the flashing check engine light came on. I immediately looked for a safe place to pull over and took the next exit (< 1 mile). Pulled into a gas station and noticed the engine was running very rough. By this time the light had turned solid.

I filled up the tank (7 gallons) and restarted it. Everything returned to normal at this point. The light was out and it was running smoothly. Drove around another 25 miles with no issues.

Took it to the dealer the next day and they read codes P0300 and P0301, P0302 and P0303. They pulled the spark plugs and checked around by saw nothing unusual. I'm a little concerned that everything happened on one bank.

The SA recommend I warm the car up more before moving and to keep an eye on things. I've put another 150 miles on the car since without any issues, but I still can't shake this nagging concern. Searched this site had provided more details on possible causes of these codes but most of these cars are way past the break-in stage. What can cause this to happen on a new engine? Did I shorten the life of the CATS because I had no safe area to pull over?

Any thoughts on this or should I just learn to relax?

-pete

Could be water in the gas - after sitting for awhile in very cold weather. Auto stores sell additives to fix that I believe.. An occasional misfire happens (p03's) and I don't think there is cause to worry..

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