Question about 1998 Chevrolet Blazer

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1998 blazer 4.3l crank but no spark condition

1998 blazer 4.3l engine. old engine started knocking. Replaced with a 4.3 out of a 98 blazer that had been rearended. Engine is hooked up. I have a Crank but no spark condition. After futzing with it for about a month i've replaced the following Checked ECM1 15a fuse...Ok. New Ign control Crank positioning swapped coil with a known working coil. Still have a crank no spark condition. Tested coil. I got 12v on pink and no signal on the white/black stripe. Tested the icm got 12v on pink wire, ground i got continuity, and the signal wire coming from computer to the icm i got no signal. I tested continuity on wire from computer to the icm and it gave me tone. I put in new computer, still no signal to icm. Put in new crank positioning sensor still non signal from computer to icm to coil. I'm at a loss on what to check now. It ran before i swapped motors now i don't get a spark. Any ideas?

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Use your key fob to start it,your security is on

Posted on Apr 23, 2017

Testimonial: "I have no key fob. Sorry."

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  • Steve Kruzich
    Steve Kruzich Apr 24, 2017

    I have a Crank but NO start condition. I have fuel to the injectors. Injectors are turning on as i am smelling fuel as its injected.

    I am getting NO signal from computer to the icd which in turn sends no signal to the coil on its white/blackstripe wire. It has a New computer that has been flashed with my vin code.

  • Steve Kruzich
    Steve Kruzich Apr 24, 2017

    it never came with a key fob. its not listed on the label in the glove box with a keyless entry code AUD Or AU0 either.

  • Steve Kruzich
    Steve Kruzich Apr 24, 2017

    Chevy dealer says no passlock on it. No keyless entry.

  • Steve Kruzich
    Steve Kruzich Apr 25, 2017

    Engine itself doesn't have anything to do with security. It is a non issue whether it came out of a car with security or not. There thats all handled inline in the dash with three components. Key with a resister, Key lock with sensor, and the TDM module which cuts power to the injectors if the key and sensor do not match. I am getting fuel and injectors are firing. Just no spark. The TDM DOES NOT turn off the spark, it only turns off the injectors.

    according to the schematics, the power wires going to the injectors converge at the fuse box into one line that goes to cam positioning sensor. The negative side of each injector goes to the pcm at chip c2 pins 8, 9, 15, 16, 31 and 32 and switches via chip c1 pins 3 and 8 which go to cam positioning sensor in the distributor.

    So there is no connection whatsoever to any security system.



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