Myself and my Porsche tech have been struggling with a difficult to diagnose fault , car was running ok then started to missfire at revs over 3800 about where the timing values change , missing on one cylinder only, but kept moving between the cylinders and across both banks , so decided to change the 4 solenoids on the DFI engine the two top and two side ones , this improved it but during a good road test the problem returned after about 4 miles of ok running its now missing on 2,4,6, disconected the maff to see what would happen, no change problem still their so it wasnt the maff playing up. no fault codes just the check engine light on the dash. very strange , have filled up with vmax on the road test to discount a batch of crappy fuel . theres a noticable lack of power on the road test even though the engine initially was running ok until the fault returned. have considered cam solenoids but would have expected a fault code for that.
anyone had similar or can throw some ideas my way :thumb:
anyone had similar or can throw some ideas my way :thumb: