85B Injector issue (car won't start)
 

Hi!

I had a timing belt failure a few months back on my 944 85b. Valves are exchanged and everything is assembled.

When i crank the car i get spark and fuel pressure but the injectors won't open. I got "tach-bounce" and i have also checked the reference and speed sensor and they both show roughly 1000 ohm.

I also got 12v at the injector harness, this should exclude that the wires are harmed?

As far as i understand the injectors are controlled on the same signal from the DME that gives the car spark/fuel pressure?

I have not checked with a noid light if there is any signal.

I have also tried to manually open the injectors with a battery with no success either. What voltage should be sufficient for them to open?

Any ideas are much appreciated!

12V and ~5A is required to open the injector (the injector coil is 2.4-2.8 ohm)

try misting starting fluid in the inlet to see if it catches?

While the car uses 12v if an injector is not stuck I have been able to pulse them with a 9v battery, usually. Sticky ones not so much. Do not hold power on them for more than a few 10's of a second, you can burn out the coils.

You should look for a ground pulse at the injectors to fire them.

-Joel.