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Help Boxster CAT Burning bright Red and Hot

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The Battery on my boxster was disconnected for around 1 week, when i reconnected it today and started it I noticed it was idling realy rough, I then drove it and it drove real badly, it was misfiring and poping and then the CEL came on. I took the car back home and left it my drive up until a few hours ago when i thought i would try again, this time I just left it running on the drive to let it warm up before attempting to drive it again, after 5-10 minutes I came out to the car to see a red glow coming from the rear passengers side (uk rhd car) I quickly turned the engine off and took a closser look, from what i could see (scarey) the whole of the rear passengers side CAT was bright orange and I could feel the heat from 4 foot away. Its now cooled down but i dont want to start it again....

Any ideas? I assume the CAT is cooked! I assume the CAT is the next item looking back from the main exhaust back box, one CAT per side?

I have had the rough driving and CEL light issue a few times before but after a few miles the CEL light went out and the car drove fine. this again was after I had disconected the battery due to a holiday.

ANy help would be greatly appreciated!!



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It sounds like you have a misfire and the raw fuel is burning in the convertor. I would not drive this vehicle until the fault is found and repaired. The convertor might not be damaged as I have seen glowing hot before and it has only killed the odd one.

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Hi Loren nice to get your view on this. I would agree in what you said It does come down getting the codes out. To be honest the battery goes flat if the car is left for more that 3 days, this has been happening for over 4 years and i have had many people try to find the drain on the battery but unable to so i just live with it. I had noticed that the last 3 times i have disconnected the battery, when i reconnect the idle and misfires have got worse but then after 10 miles or so it passes and the CEL goes out apart from this time!

I had read on a previous post about letting the DME learn the idle again so i left it runnning on my drive for 6 minutes or so and that when I noticed the burning red CAT, but it appeared to be only the passengers side one (UK RHD CAR) anyview on that?

Thanks again


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