Quote:
Originally Posted by Bill Verburg
That certainly complicates things, Lord only knows what wiring changes were done to that car.
Does the Porsche dealer say whether it's fuel or spark that is missing?
It's much harder to diagnose these days but back in the day you generally checked for those 2 things first
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Indeed, I had a long conversation today with the Porsche technician and he agreed that the next step would be to remove all the non-factory wiring changes that were currently complicating things in the fuse-box panel. He will remove all that wiring and investigate and repair as required to eliminate them from the list of possible causes of this problem.
He stated that in his experience this problem generally gets solved once the DME is replaced, however they are thin on the ground. I'd have to buy or borrow another one to test this idea. The nearest new DME is in Germany and it's about $5000 from the dealer.
I know we aren't achieving a spark at the coils, the mechanic stated that not all the grounds are giving the signals that the DME wants and so the coils are not getting energized. He also said that he tested the fuel pump and it works just like I had also found, but he said he was still a little suspicious. I'd say we believe currently that it's spark that is missing, but he's keeping his options open.
I asked if it would be possible to simulate the correct signals from the grounds to see if the engine would then start, but he said it would be too complicated as there are multiple grounds that would all need to be jumpered and his worry was that any mistake could fry the electronics.
In any case I could possibly reach out to some club members in the UK forums if I knew all the compatable DME's for my car.