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1984 944 Cold start

Engine

Vehicle Information: Year: 1984; Engine (type, size, modifications): 2.5 litre SOHC, chipped; Total Mileage: 70,000;

I'm wondering if you can help me troubleshoot a problem we're having with our 1984 Porsche 944. It is quite annoying, and this problem only recently popped up, but as the racing and DE season approaches; it's important that it is fixed ASAP! The car cranks hard, but doesn't start. fuel pump, filter, relay all fine. new spark plugs, new coil. changed oil and filter. New DME (done by F.R. Wilk), new air filter, new clutch, new water pump, new timing belt, etc etc etc. The only things that haven't been done: cap and rotor, spark plug wires.When the weather gets cool, say below 50 degrees Farenheit, the car won't start. It cranks and cranks and cranks but it won't start. This problem has been traced to quite probably being the crank reference sensors. I replaced one of the sensors and now the car won't start at all! We put the original sensor back in and the car still won't start!Just like before, the car cranks and cranks but it just won't start running. Are there any tips you can offer to help us out? We are perilously close to missing our track time if we can't get the car started. The closest Porsche garage is no closer than 1 hour from our house.Just to restate... the car can sit for a week and if I try to start it and it's warm out, it starts absolutely fine. The car can sit for 6 hours and if the temp drops to below 50 degrees or so, it won't start. I can crank forever and it just will not start.

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