Crank no start
#1
Crank no start
I'm having a hard time with this 2001 Chevy blazer 4.3L. It will crank but not start. Tested ignition module and coil and they are good. But I'm not getting a signal on the on the B terminal with white wire coming from pcm. Checked continuity on that wire from pcm to icm and its good. Put in new crank shaft position sensor and have continuity from all three wires on ckp sensor harness connector to pcm. I also have 60 psi fuel pressure . Checked for spark at plugs and have it. New cap and rotor. All fuses are good took off spider wire harness and noid lights up on all when cranking. Ohmed injectors all at 10-11 ohms. Why wouldn't the pcm send a ignition timing signal if the crank position sensor circuit is good? Security light is not on while cranking.
#3
Yes I have good fuel pressure to the spider. And I pulled the harness off the spider and put a noid light in each injector harness and it lights up while cranking. I have an inline spark tester that I put between the spark plug and wire I can see light up when I crank. I cant say how good the spark is. What I dont have is that pulse signal from the pcm from pin C2 26 to the ignition control circuit B white wire. Which I thought I should have with a new ckp. I took the plugs out last night and they look fuel fouled. I also tried spraying starting fluid in in which didn't do anything.
#5
George I think you're right but my in line spark tester lights up while cranking. Plugs are wet when I pulled them. But I know that white wire circuit B isn't getting a signal. May be just a week spark. I cant figure it out.
#7
I put a spark tester that's basically like a light with plug wires going in and out of it. I hooked one side to spark plug other side to plug wire. Also did this at the coil to coil wire going to the distributor cap and the like pulses when I crank it. I didn't think this was possible without the pulse signal from pcm to icm. But I've checked and triple checkch.