90 944s2 no start

[benzboy]

my s2 has a no start issue. last year before the winter. it was running fine, it did sit in the garage for a handful of years. the car began to miss a little. thought it was bad fuel. so i added some seafoam to the fuel. then all the sudden. it wont start. it cranks but no start. i have spark and dme rely is good. i pulled the injectors. and i get a pulse. i pulled the fuel pressure regulator vacuum line. and fuel drips out. i dont have any way to check fuel pressure. so would the fpr be the problem.

[944 Ecology]

Buy the tool to diagnose your problem instead of spending money on parts you don't need.


https://www.amazon.com/Pressure-Kit%EF%BC%8C0-140-Tester%EF%BC%8CFuel-Injection-Gasoline/dp/B09JVGDP5X

[walfreyydo]

You might have contaminated already bad fuel due to adding seafoam.

See if it will start with starting fluid sprayed into intake.

Could be many things, speed /ref sensors, FPR, etc. Follow the steps on clarks:
http://www.clarks-garage.com/shop-manual/ts-01.htm

FPR should not be leaking fuel out the vacuum line so thats a possible issue (but I think it should still start/run). Speed/ref sensors are the next culprit (although I dont think youd have spark if these were bad), assuming you are 100% sure the dme relay is good. If you have fuel and you have spark, it should fire - assuming your timing is correct and belt is intact. You can test for fuel pressure by removing the cap on the fuel rail and pushing in the pin valve to see if you get pressurized fuel squirting out. Obviously this wont tell you what your pressure is, just whether you have it or not. If you have fuel pressure then I would suspect injectors (there is a guide on clarks for testing the voltage to injectors for signal from DME)

[944 S2]

Try plugging the fuel dampener vacuum line and see if it starts. If its bad its dumping raw fuel directly into the intake and flooding causing a hard to start issue. Plugging stops the fuel from getting in.