2003 gmc envoy

[James taylor]

Need help with 2003 gmc envoy. No spark to coils. Fuses ok. .

 

[TollKeeper]

Other than checking the fuses, What other diagnostic work have you done so far?

 

[James taylor]

New egnition switch. New battery. Checked fuel pressure (53)
Then checked coil no spark

 

[James taylor]

Ignition switch. Sorry trying not to get grease on this iPad. I started it Tuesday morning let it warm up. It went dead and so was the battery. Hasn’t started since

 

[TollKeeper]

Is the security light on? Its on the speedo cluster, looks like a key, or says security (i cant remember which at the moment)

 

[Blckshdw]

My apologies @James taylor I was trying to merge your last 2 posts together, and the site ate them instead.

 

[James taylor]

Light is not on

 

[TollKeeper]

Hmm... What happens if you jump the starter relay with the key on?

 

[James taylor]

Haven’t tried that. It turns over I didn’t see the point. Can you tell me.

 

[TollKeeper]

You are correct, I misspoke. My apologies. I am at the limit of my knowledge on the 4.2. Hopefully one of the guys that know this engine a bit better will come in.

 

[mrrsm]

https://gmtnation.com/forums/threads/06-envoy-4-2-crank-but-will-not-start.11020/
https://dannysengineportal.com/no-spark/
https://gmtnation.com/forums/threads/crank-no-spark.19294/