On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
I have seen similar things on motorcycles and turbo cars where the engine has been run lean.
Running lean causes pre-ignition and detonation, which causes melted plugs and pistons, and often chunks to be eroded from the head.
Could be a MAF, Lambda, or air leak somewhere after the MAF that has caused it, or even a failed/partly blocked injector.
Did you have any pinking noises under acceleration?
Last edited by symon; 28-01-11 at 21:50.