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Today I resoldered the solder joints on the PCB of the immobiliser.
Refitted the module and started the car.
No more rough running. Finally found it after a very difficult search.
Arrrrggghhh! Cold solder joints are a nightmare. I'm sure we will experience many more of them in the years to come on these cars. DMEs are leading the way in this area, but the immobilizer is not far behind I see.
Daxmainian, Highly impressive debug work, with all the plots and oscope data, etc.
Originally Posted by JB 911
993 DIY thread of the year. Congrats.
+1
Along with an award for "Most Tenacious 993 Owner"!
I couldn't see real obvious evidence of solder cracking.
It was because I had this problem also with the controller for the cabriolet roof, which I also resoldered, that I thought this could be the same.
Any advice? First try to find out what exactly is going on. This was difficult in this case because everything seemed to work. I had to take out the special tools to find this out, the oscilloscope that is.
Had my first real test drive today, felt really good. Had a huge smile the whole drive.
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