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Registered User
Join Date: Mar 2017
Posts: 1
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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! |
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03-24-2017, 07:49 AM
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Registered
Join Date: Mar 2008
Location: Nashville, TN
Posts: 4,050
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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? |
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03-24-2017, 08:36 AM
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Registered
Join Date: Oct 2002
Location: Boulder, CO
Posts: 1,197
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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.
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1987 928S4 1992 968 cabrio 2009 957 Cayenne GTS |
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03-24-2017, 08:50 AM
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