Vortec engine problems

[Jwidmayer1337]

Alright guys need some help. My truck intermittently stalls. Just dies while driving. It will also do it in park. It starts back up every time but sometimes it takes a minute or so. I've been chasing this issue for 2 months and I'm stumped. It's got a new delphi fuel pump and filter. New distributor 6 months ago. New cap and rotor at the same time. It's so intermittent that I'm having a hard time tracking it down. Truck is a 2000 gmc k3500 with 136k on it.

 

[97K1500Silverado]

Coil?
Ignition control module?
Ignition switch? Jiggle key around and ignition switch while truck is running does it die then?

 

[Jwidmayer1337]

Yeah I was wondering about the ignition module. Almost at the point where it's so intermittent that I'm just gonna go throw parts at it lol

 

[Jwidmayer1337]

I'll keep you posted. I'm getting a module and coil right now

 

[red98]

I'll keep you posted. I'm getting a module and coil right now

90% of the time its the ignition module, those damn things fail left and right, and usually less than a $50 part if I recall, if you start throwing stuff at it start there.

 

[Jwidmayer1337]

The problem is so intermittent that testing anything is out of the question and I'm pretty annoyed. I'm 2 min from home with a new module and coil. I'll update soon

 

[stutaeng]

Those intermittent problems are the most difficult to diagnose.

The parts cannon approach will only frustrate more.

Do you have any codes? You really need to get ahold of a scanner with live data. Really, you need a scanner that also records data. Go for a drive with it hooked up.

You need to see what I formation falls off as the truck dies. That's the key. If you have a wire shorting out, for example, you will never find the problem by changing parts on it.

 

[Jwidmayer1337]

Thats a really good point. I haven't thought of trying that yet. I'll ask around for a scanner. And I just drove it with the new module and it stumbled for a second and didn't completely die this time. Side note as well, When I put the new fur pump in the problem went away for like 4 days then came back. Not sure if that's a coincidence or if I should think fuel system

 

[HotWheelsBurban]

Since it did it after when you changed the fuel pump, it may be an intermittent grounding issue. These trucks are notorious for wiring problems, because GM cheaped out on the harnesses to keep them light, and after 20 to 30 years of use as a truck, stuff rattles loose or breaks. I'd be looking very closely at the wiring harness, around the fuel pump, and around the ignition ( underhood and underneath the dashboard). Good luck! And let us know, cause others of us may need this information sooner or later.

 

[LC2NLS6]

One trick I used on my boat to find bad wiring, get it started then start wiggling wires to see where it might be shorting/corroded and cause it to studder/die.