Apologies in advance for a long post- but the background could be important.
After reading many posts on both Rennlist and Pelican I am still at a loss trying to get my car to start.
Some time ago my wife had the car, a 1995 993 C4, to commute to work. The drive in went perfectly and on the way home she stopped to refuel. As she was rejoining the motorway and just shifting into third gear the engine quit. She managed to pull off to the side of the road where she tried several times to re-start with no luck. The car was then recovered and dropped off on our driveway. I came home from work about 4-5 hours later and we decided to put it in the garage so I could investigate. We were ready to push it in, but decided to see if it would start and happily it did so she drove it in. It has not ever started since then. It will crank, but it will not start.
Upon initial investigation I found that I wasn't getting any spark. At this point I verified the DME relay was working and even bought another one just to double check that this item was not to blame. I was able to also perform some checks at the DME connector to verify I was getting readings that were correct. I even had a thread on Rennlist for this, here's the link,
https://rennlist.com/forums/993-forum/998726-no-trouble-codes-no-spark-no-start-95-993-c4.html
As time went by I ran out of ideas so I hired an automotive electrician to come and fix the car. He visited my car on 3 occasions for several hours each time and never could figure out what was wrong. Finally, he stopped answering his phone when I called.
Next step was to have it sent to the nearest Porsche Service Center as I figured they will have the correct diagnostic tools to find the problem. Well, after 5 weeks with them we are no nearer to solving the problem. They have verified the alarm control unit is OK by replacing it temporarily with a brand new module and the DME has been sent out to an independent shop for testing and come back as OK with no faults. However, they now suggest that replacing the DME is the solution to my problem, which to me doesn't make sense.
But, does it make sense that the drive block could be the culprit here? Would performing the immobilizer bypass procedure method suggested by Bill Verburg in this forum possibly solve this issue since the electricians and Porsche Master Technicians haven't found anything else wrong?
The Motronic Unit is 993.618.124.04 , 0.261.203.675.
Any ideas out there?