Hello
I have a 85.5 944 that has a intermittent cranking problem.Sometimes it will only just turn over and will not start. I can disconnect and then reconnect one of the reference sensors and she is good to go. Never have a problem with it shutting down, only a start up problem. I recently replace the wire harness from the computer feeding the sensor etc.. also the reference sensors were repalced , but it has been a couple of years ago (replaced with new ones at the time). I have also replaced the ECU. It really seems to be something very simple, but I'm running out of ideas. I read on the forum some talk about the alarm system. I'm open to any suggestions

check all the grounds and also make sure the clearance on the sensors is correct..whe it wont start have you checked to see if your getting spark?