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Boxster S Summer Misfire

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I have a 2000 Boxster S w/ Tiptronic. During most of the Autumn, Winter and Spring the engine runs smoothly. But when the weather gets over 75 degrees it misfires at Idle after warm up. After I get going it runs fine but sitting a traffic light it stutters and splutters. Took it to a shop last fall - said the 3rd cylinder was dropping out -- didn't/couldn't find out why. Ran well all winter but is doing it again in 90 degree heat wave here in Philly. Techron works OK - but next tank full it starts again. Am using Sunoco 94, too.

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You will need to put a OBD II scan tool on it to see if it is generating fault codes (not all fault codes turn on the CEL). The better tools will actually graph the performance of key components (like the MAF, fuel trim, O2 sensors, etc.).

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Were you able to find out what was wrong?

I'm just starting to see the same problem. Startup is fine, but once I get about a mile down the road and hit a stoplight it starts to stutter big time. I give it some gas and it seems to even itself out and the problem goes away. Almost seems like a wonky air/fuel issue but somehow corrects itself(?). :cursing:

The first time this happened was about a week ago. It hasn't done it since until today. Looks like another trip to the dealer. Guess I can get my window regulators fixed again while I'm at it.


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