Help! 1999 Chevy Tahoe no start issue!

[TollKeeper]

With it not running, those are completely normal..

 

[YukonGTmaster]

The check gauges and battery light will be on, until the engine is running and charging the battery. The service engine soon is probably related to your P0340 code that has latched.

 

[OR VietVet]

The check engine light will go off when engine starts, unless of course you still have your P0340 code in there. That light comes on as a self test when the key is turned on and before you start the engine.

 

[Sammie859]

With it not running, those are completely normal..

The check gauge light is what threw me off. I’d never seen it on before.

 

[exp500]

Buy a spark tester Sammie 859! You can do it!
Tach operates off Terminal "D" of Ignition control module thru Ignition coil Term"C" White/black wire exiting coil on Term"B" to tach input.
PCM connector C1(blue) pin 8 cam sensor ground, pin 3 cam sensor signal(X1).
So possibly an ICM connector issue.

https://lt1swap.com/1999_vortec_5.7/Ignition%20Controls.gif

https://lt1swap.com/1999_vortec_5.7/pcm_connector_end_view.htm

https://lt1swap.com/1999_vortec_5.7/Ignition%20Controls.gif

 

[Sammie859]

I had my husband unhook the battery (positive and negative) this afternoon and I’m gonna leave it til tomorrow. Hopefully it’ll drain the entire system. See if the computers and sensors maybe reset.

 

[Sammie859]

You mention changing the plug wires. Have you verified the cap to plug order is correct? I am sure you did but this was one thing changed right before the issue appeared.
Verify and eliminate the most obvious and easiest things first.

I did check #5 and #7 today and they are correct.

 

[Sammie859]

Buy a spark tester Sammie 859! You can do it!
Tach operates off Terminal "D" of Ignition control module thru Ignition coil Term"C" White/black wire exiting coil on Term"B" to tach input.
PCM connector C1(blue) pin 8 cam sensor ground, pin 3 cam sensor signal(X1).
So possibly an ICM connector issue.

https://lt1swap.com/1999_vortec_5.7/Ignition%20Controls.gif

https://lt1swap.com/1999_vortec_5.7/pcm_connector_end_view.htm

https://lt1swap.com/1999_vortec_5.7/Ignition%20Controls.gif

What do I do? Check the pins with the tester?

 

[Sammie859]

OMFG. I got the big b**ch started! Plugged my battery back in. Charged it (let it get to 95 percent cause I’m impatient) held it over, it kept cranking, gave her some gas here and there and she started. She has a rough idle. I know I need to drive it to do the relearn for the crankshaft sensor. So that’s what I’m doing now!

 

[Sammie859]

When was the FUEL PUMP last replaced ?

I’m not sure when or if it’s been replaced. I’ve had it for a year!