I am looking to collect some info on misfires on Cayman S's. I have just had my warranty claim refused by Porsche because they say my Milltek exhaust caused the misfire. I am wondering how many owners have had misfires, but mainly on zero modded cars?

The cat on the r/h bank of the engine was melted I am told and this was the cause of the misfire. I wonder if the misfire came 1st then that trashed the cat, which means it probably happen again, even now I've got the original exhaust back on. I got the engine log print out and there was 14 misfires from cylinder 3, one or two misfires on other cylinders.

Any info will be of great use, even for my own peace of mind as I'm pretty sure Porsche GB won't change their mind.

Sorry to hear about your problems. I had misfires on all the cylinders on the right side (1,3,5) when the car only had 700 miles on the clock.

It have been sitting for 10 days with 1/2 a tank of gas in cold temps (-4 tp -7 degress C). After warming up and driving 10 or so miles, the car sputtered and the CE light came on. After filling up and restarting, the problem went away.

The dealer pulled the spark plugs to check for fouling and found no issues. I'm at 3200 miles now and haven't seen it happen again <<knock on wood>>.

I always top the tank off after driving it now (easy to do since I only use it once a week at most).

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Pete

2008 Meteor Grey CS, PASM, Chrono, Sport Seats, Sport Shifter, Sport steering wheel, Xenon, Fire Extinguisher, Auto Climate and clear bra!

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It might be a good idea to start a list. My car had misfires when the Milltek cats failed, which occurred first I don't know, but after replacing the Milltek cats the misfires went away. Scott Slauson the PCA-TECH told me there was a Porsche service bulletin on misfires for the Cayman but I'm not sure we have it in our library so you might check with him and see if he has it. What is it you are asking Porsche to cover? They won't cover your Milltek cats, was something else damaged? I know of at least one engine replacement where there was some cam bolt that was the wrong size and that the engine had misfires and was replaced by Porsche but I don't know if those misfires were related to the missfire service bulletin or not, again ask Scott he probably knows the details. Obviously continue to monitor your car for misfires.

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K-Man S
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Hi there i am up in Aberdeen too, I was just told by official porsche (town and county) where i bought the car that any mod too any part of the vehicle, would invalidate the whole warrenty. Why is UK Porsche different to usa porsche?

Anyway good luck in trying to get a result. Did they give you an indication as too the cost of repair.

James

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99 DC2 Honda Integra typeR 00 Audi TT 180 coupe
02 DC5 Honda Integra typeR 01 Alfa Romeo spider 3.0 V6 01 Honda s2000 03 Audi TT Roadster 225
02 Porsche Boxster S 07 Porsche cayman 2.7

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2007 Design Edition 1 Cayman S

I know they won't cover the Milltek cats, but I would have liked say that there is a history of misfires with the engines and would they swallow the cost of labour for checking the vehicle. As for the Milltek cats, that's money down the drain as Milltek no longer manufacture them and also don't honour the warranty on them. They say the issue is with Porsche and their merchandise is perfectly acceptable.
I will keep checking for misfires, just incase.
The bill is still being totalled, it was 10 hrs labour, might be more now....