I have a no start condition on my 87 gn, a quick summary of where I am at:
I have injector pulse (verified by noid light)
fuel pressure at 40 psi
ses light is on with key in run position
no error codes
I followed the no-start tree and get to step 3, where it tells me to check ign module or ign mod connection. I've tried 3 different ign modules and get the same result. Because I have injector pulse, the crank and cam sensor should both be working. I checked continuity on all wires that run between the ecm and ign module....all are good. all pink/black wires have 12 volts.
What seems unusual is that when cranking the engine, the dash displays rpm but my scanmaster does not. If I remember correctly, it should display rpm....someone please confirm??? I get 2.4v on B5 CRANK REF HI......which should indicate that the ecm is getting a signal from the Crank sensor. It feels like I'm getting close to figuring this out.....is there anything else I should check at the ign module or ecm with my multimeter? Bypass, CRANK REF LO, est control.......is it possible these could contribute to no spark?
Thanks in advance
I have injector pulse (verified by noid light)
fuel pressure at 40 psi
ses light is on with key in run position
no error codes
I followed the no-start tree and get to step 3, where it tells me to check ign module or ign mod connection. I've tried 3 different ign modules and get the same result. Because I have injector pulse, the crank and cam sensor should both be working. I checked continuity on all wires that run between the ecm and ign module....all are good. all pink/black wires have 12 volts.
What seems unusual is that when cranking the engine, the dash displays rpm but my scanmaster does not. If I remember correctly, it should display rpm....someone please confirm??? I get 2.4v on B5 CRANK REF HI......which should indicate that the ecm is getting a signal from the Crank sensor. It feels like I'm getting close to figuring this out.....is there anything else I should check at the ign module or ecm with my multimeter? Bypass, CRANK REF LO, est control.......is it possible these could contribute to no spark?
Thanks in advance
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