Help! 1999 Chevy Tahoe no start issue!

[Tonyrodz]

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!

Is your check engine light on?

 

[exp500]

Glad its running Sammi. Stop and get codes scanned, hopfully by a different person. Trying to verify no P1345 present.Post Codes please.
Spark tester on coil terminal and Distributor coil terminal. That will determine if coil wire or grounds weak if there is a difference between the two.
I posted the wiring diagrams to shut up the guesses. And to help your mechanic.
Next Battery disconnect, Unplug PCM , check clean and dry (Dielectric grease good here) Replug.
If still chasing miss, wiggle wires on ICM while engine running to see if it changes.
Report back.

 

[Sammie859]

Is your check engine light on?

Relearn complete. And NO CHECK ENGINE LIGHT. This makes no sense. Why would it start now and not before?!

 

[exp500]

Flooded, Battery loose, Connector Loose somewhere, Lots of reasons. Still could have problem(s).
Watch it closely. Relearn was fast. How do you know its complete?

 

[OR VietVet]

Relearn complete. And NO CHECK ENGINE LIGHT. This makes no sense. Why would it start now and not before?!

Does it still have the rough idle?

 

[Sammie859]

Glad its running Sammi. Stop and get codes scanned, hopfully by a different person. Trying to verify no P1345 present.Post Codes please.
Spark tester on coil terminal and Distributor coil terminal. That will determine if coil wire or grounds weak if there is a difference between the two.
I posted the wiring diagrams to shut up the guesses. And to help your mechanic.
Next Battery disconnect, Unplug PCM , check clean and dry (Dielectric grease good here) Replug.
If still chasing miss, wiggle wires on ICM while engine running to see if it changes.
Report back.

There’s no check engine light on. Idles good. I did the relearn for the crankshaft sensor. She drove good.

 

[Sammie859]

Does it still have the rough idle?

No, it was idling fine after the relearn. And no more “shimmying” either.

 

[OR VietVet]

Wow, that is great news. Deeeeeep breaths, deeeeeep breaths......

 

[Sammie859]

Flooded, Battery loose, Connector Loose somewhere, Lots of reasons. Still could have problem(s).
Watch it closely. Relearn was fast. How do you know its complete?

Someone gave me directions in this thread on how to do the relearn.

 

[Sammie859]

Wow, that is great news. Deeeeeep breaths, deeeeeep breaths......

I know right! I was so excited and ready to jump up any down! Me and this hoe have a love/hate relationship! Haha. I will watch her closely tho. Still think somethings off. Doesn’t make sense why she started now. Has me puzzled.