No spark

[Kassidy]

I have a 1996 gmc 1500 with the 5.7 with new coil, cap and rotor and still no spark any one know why ?

 

[Nad_Yvalhosert]

We need more information, and you're gonna need to do some more diagnosis on your end.. Theres no way I can hook up my scanner through the internets.

How do you know you dont have spark?

Why did you replace the coil?

Did you replace the plugs & wires?

Have you scanned it? Check for RPM reference on the datastream. That'll confirm the commonly bad crank sensor.

Perhaps the module (right next to the coil) is bad?

Have you checked for 12v power at the coil?

What prompted you to replace the coil, cap, and rotor?

 

[Kassidy]

We need more information, and you're gonna need to do some more diagnosis on your end.. Theres no way I can hook up my scanner through the internets.

How do you know you dont have spark?

Why did you replace the coil?

Did you replace the plugs & wires?

Have you scanned it? Check for RPM reference on the datastream. That'll confirm the commonly bad crank sensor.

Perhaps the module (right next to the coil) is bad?

Have you checked for 12v power at the coil?

What prompted you to replace the coil, cap, and rotor?

It has no spark to coil

 

[454cid]

It has no spark to coil

You mean from the coil. How are you testing this?

How does the engine behave when trying to start it? Does it just turn over, or does it seem to try to "catch" and/or "cough", or "backfire"?

I would encourage you to reply to each one of Nad_Yvalhosert's questions, with as much detail as you can.

 

[GoToGuy]

Do you have a more experienced friend?