Mickey Posted July 4, 2016 Report Share Posted July 4, 2016 Hi all new here and looking for advice with my 2003 gti - I keep getting black specs up the back of my car it's had a bottom end rebuild 10k ago so I doubt it's the piston rings, it's fitted with a scorpion power flow cat back the black specks seem to be carbon out the exhaust and accumulate over a couple of days after washing the car - anyone on here experienced this at all ? Any advice appreciated - thanks Quote Link to comment Share on other sites More sharing options...
Vwlup0 Posted July 4, 2016 Report Share Posted July 4, 2016 I was always under the impression black spots were piston rings I have a straight through with a power flow back box and get no carbon deposits on the back of the car Quote Link to comment Share on other sites More sharing options...
Mickey Posted July 5, 2016 Author Report Share Posted July 5, 2016 Cheers for that I'm a bit gutted really as I only had them done 10k ago time for a 18t I think Quote Link to comment Share on other sites More sharing options...
Mobieus_uk Posted July 8, 2016 Report Share Posted July 8, 2016 maybe mixtures are wrong and engine running rich generating soot Quote Link to comment Share on other sites More sharing options...
Mickey Posted July 15, 2016 Author Report Share Posted July 15, 2016 removed exhaust and cleaned it out with wheel acid - was full of oil and carbon from before the rebuild - clean as a whistle noww and not one spec coming out the back 1 Quote Link to comment Share on other sites More sharing options...
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