Will not start, no spark

CHEVROLET BLAZER

TJANKUSKI

MEMBER
3 POSTS
FOLLOW

I had to replace the motor because my oil lines blew off. I need to replace the motor which I have now done. I have tried to start the truck and with the new motor in it and I am not getting any spark. I have replaced the Crankshaft Sensor, Ignition Coil, Ignition Module, Distributor cap and rotor and still no spark. I have checked to make sure that there is power going to the coil but nothing is coming out. I have checked all the fuses and the are fine. The ECM is fine. I have put it on a computer and everything came back fine and I am still not getting any spark. Please Help! I am so very frustrated.

Thanks

Tina

Jul 26, 2007 at 5:10 PM

CHEVY22

CAR REPAIR CONTRIBUTOR
1,375 POSTS

is your cam sensor plugged in? it's in the dist at the firewall.

Jan 29, 2021 at 2:12 PM

TJANKUSKI

MEMBER
3 POSTS

Yes it is plugged in and has been replaced. All the sensors have been replaced. Any other suggestions?

Jan 29, 2021 at 2:12 PM

CHEVY22

CAR REPAIR CONTRIBUTOR
1,375 POSTS

how about the crank sensor is it plugged in and shimmed properly? i am going to do this one piece at a time since so many engines have been replaced. also the ic module has both plugs in?

Jan 29, 2021 at 2:12 PM

TJANKUSKI

MEMBER
3 POSTS

Yes the sensor is plugged in and also has been replaced. I am not sure what you mean by shimmed properly. I did not know it needs to be shimmed. It wasn't shimmed on my old motor. My ic only has one plug.

Thanks,
Tina

Jan 29, 2021 at 2:12 PM

KASEKENNY

CAR REPAIR CONTRIBUTOR
18,907 POSTS

To answer the shimming question, that could be the issue if the gap on the crank sensor is not correct. If the sensor is too close to the tone wheel it could make contact with it. If the sensor is too far away, it will not pick up the rise and fall of the tone wheel. Basically the crank sensor picks up the leading and falling edge of the tone wheel and it can determine what position the engine is in based on the cylinder 1 TDC gap in the tone wheel.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

Jan 29, 2021 at 2:12 PM

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