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Hi Porsche people
I changed the spark plugs of my 955 CTT yesterday and I think the plug on cylinder 6 is not as the others. For me it does not show a realy scary image
and I'm sure it is not urgent but can you see something more?
#6 appears to be seeing some oil. That might concern me. Before panicking.. I'd try swapping coils around and then check the new ones after 1,000 miles or so. It might just be misfires (are any recorded in the ECU?) - but the glazed look is usually a sign of oil. What is your oil use like?
Thank you for your answer. Nope, no misfires and no records on ECU. And the oil consuption is realy low... about 1L every 2'000km-3'000km (1'200mls-1'900mls).
How many miles are on those plugs? Could be oil, but looks a bit more like a rich condition (or weak flame front) than oil fouling on my screen. I agree with swapping that coil or replacing it as a first check.
Ok guys.... now I felt the difference... I replaced Bosch plugs after 20'000km with NGKs. With the Bosch plugs I had short missfires on the Swiss autobahn (highway) when I accelerated easily just before the car went down from 6th to 5th gear at about 120kmh (about 75mls). I thought that's a transmission problem. Now with NGK plugs this missfires are gone and the acceleration is smooth without any trouble. Strange thing is that there were no faultcodes... I hope this didn't cause any damage to the engine.
05-14-2017, 07:35 AM
Changed spark plugs yesterday
