I'm new to the site and I have a problem with this blazer 4.3 I bought it not running
there was no spark at the ignition coil when the previous owner had it so he changed the coil and still no spark changed the distributor and still no spark so he sold it
when I got I changed the ignition module and no spark changed the crankshaft position sensor and still no spark
can any of you guys point me to right direction

I'm currently checking the camshaft position sensor wondering if the pink wire going to the sensor suppose to be 12v and was wondering where it comes from because it doesn't come from the PCM

Thank you

 

You need to test the signal chain from the crank sensor to the coil. Here is the first test, the crank sensor output:

https://troubleshootmyvehicle.com/gm...oogle_vignette

George

 

Welcome to the forum. This is the place to get your Blazer running and to keep it going.

I can't help much with your specific problem, but you are in good hands with George. We have lots of others here who can help too.

Be sure to let us know how things go.

 

Thanks for the Info George I did what the troubleshoot said and found out that my new crankshaft position sensor was giving me a 10v reference I put the old one back in and that one gave me a 5v reference will check the rest tomorrow

 

Once you have the crankshaft sensor output verified then its on to the ICM:

https://easyautodiagnostics.com/gm/4...o-test-the-icm


George