Stalling Problem

96chevy7.4L · October 21, 2008

I am at my wits end. I have a 99 chevy c3500 7.4L vortec. I loaded the superchips max micro tuner. The truck runs real good. But it started stalling when I come to a stop at a traffic light. It cranks right back up after it stalls. Now here is the crazy part its not blinking a code in the computer. i have put plug wires in it a fuel filter. Only has 40,000 on the ac platinum plugs and still stalling. ANY IDEAS appreciated.

ALange · October 25, 2008

I am the wrong person for technical advice on any engine with a computer, but 40K on plugs seems like a lot to me. I doubt that is your problem as you say it ordinarily runs good. I am just a stickler about changing parts that are cheap and easy to reach. My rule of thumb is that parts perform well for half the life they claim. I guess I would replace fuel filter if old, check air filter, check plugs, plug wires, and timing and see what happens. Of course that never works for me

merlin5577 · October 25, 2008

Did the truck stall like that before you loaded the programmer?

L29er · October 25, 2008

still having problems?

96chevy7.4L · October 26, 2008

Yeah still having problems. I have put wires and fuel filter the only thing left is plugs. I don't think 40,000 is alot for those ac delco platinum plugs. I can put a set of plugs in it. Oh I meant to mention I put those 40,000 on it almost all heavy towing miles. With my tractor and other tractors on it. I went through the mountains on 77 in west virginia with 2 tractors on it. Just lil more info to consider. If you think it needs plugs let me know and I will put more in it.

96chevy7.4L · October 28, 2008

The problem with the stalling is in the superchips programmer. I found it out after all the work I did to it. I was at my last idea. I put the truck back to stock and all the headaches went away. Any ideas let me know.

96chevy7.4L · October 30, 2008

The superchips program has been uninstalled. The stalling prob is still there. No codes in the computer and no check engine light. knowing this I put plugs, wires, cap and rotor, fuel filter, ignition module, a map sensor for curiousity in it, and checked the coil. There aren't to many things left to do. Any ideas greatly appreciated.

grampadirt · October 30, 2008

The superchips program has been uninstalled. The stalling prob is still there. No codes in the computer and no check engine light. knowing this I put plugs, wires, cap and rotor, fuel filter, ignition module, a map sensor for curiousity in it, and checked the coil. There aren't to many things left to do. Any ideas greatly appreciated.

You might check the IAC(idle air control) valve,it's attached to the throttle body.

g'dirt

pennzoil29 · October 30, 2008

Just a thought, but did you check the egr valve? You may have a vacuum leak around the throttle body.

96chevy7.4L · October 31, 2008

Hi I replaced the IAC (idle air control) and it stalls here and there but not as bad as it was. any other ideas are appreciated.

Mike G · December 1, 2008

I found that a worn distributor was the culprit on my 92....

--Mike

tweeder · December 22, 2008

I am at my wits end. I have a 99 chevy c3500 7.4L vortec. I loaded the superchips max micro tuner. The truck runs real good. But it started stalling when I come to a stop at a traffic light. It cranks right back up after it stalls. Now here is the crazy part its not blinking a code in the computer. i have put plug wires in it a fuel filter. Only has 40,000 on the ac platinum plugs and still stalling. ANY IDEAS appreciated.

I am having the same problem with my tune after my mods for me its just a matter of going out and tune it properly with HPTuners. For you its definately something in that tune thats causing it hence it goes away withe the stock tune. Theres a few things that would cause it in a tune. I would get a hold of superchips and let them know and see if maybe they can re-program the tuner.