Originally Posted by Luddite
Possible issues around Classics and exotics..?



John, I dislike to be the one to dampen your ardour re the 997.2 on...(-: It seems Porsche may not be alone in reports of possible intake manifold fouling on Direct Fuel Injection (DFI) engines as the sludge from the crankcase and other areas of the engine is fed back into the intake in the DFI engines to cut down on emission readings, as the intake manifold does not have the benefit of regular petrol washing, as do indirect, single point injection, or carb fed engines have..? Lots to be read with a bit if interweb searching, blasting with the shells of nuts seems to be one option... Nuts or what...? (-:

Thanks for that, I'm not surprised as most modern DFI clean burn engines seem to sludge up. The wife's diesel SLK is renown for problems with the DPF especially if used for short journeys, but if driven appropriately and a regular DPF cleaner added to the fuel, so far we have no problems. The only strange thing is that it supposed to go thru the DPF cleaner cycle during a sustained high speed journey, ours even does it on a short local run once the DPF gets upto 40% full. I can always tell when its on a DPF cleanup cycle as you can smell the acrid burnt fumes from the exhaust and the fans are running on for sometime after switching off the engine, when putting away in the garage.

Looks like it will have to be the 993 then.........must admit I'm struggling to find a replacement car for the SLC I sold....just love the wife's diesel. I've been looking at Plus 4's recently as I seem to be getting a money burning a hole in my pocket syndrome, just hope my back is upto the slightly better lower seating arrangement of the 2 seaters.....time will tell.

Last edited by JohnHarris; 03/12/23 03:56 PM.

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