archer39

My brothers 98 12v has a hard time starting and staying running at idle for the first 20 mins while it is running. After it has gotten up to operating temp it is better but still stalls while in drive and when you turn the AC on. The idle is set to 950 in park and drops to 750 when put in drive. If you don't give it some throttle when you put it in drive it will stall. Also, is it normal to have to give some throttle when starting a p-pump truck?

The truck has a #10 fuel plate and 3000 rpm GSK. We just changed the fuel filter and there are no visible fuel leaks. I Checked the fuel system by pressurizing the fuel tank and there were no visible leaks in any of the lines. What else could cause this if there is not any air getting into the system or a plugged up fuel filter? If the timing slipped would it cause this??

Thanks

DNRCustoms

I would get a fuel pressure guage on it to see what you are getting. P-pumps love fuel pressure unlike the Ve. Should have atleast 22-25 at idle. Also, did you just recently do the 3k kit. If so, that migh not be adjusted properly. I did one truck not to long ago that gave me fits. usally they are easy to do. But I had to set one real loose compared to stock to get the idle right. I think you would be getting some smoke if the timing slipped and definatly lack of pwr.

archer39

yes we did the 3k kit about 4 months ago but it acted this way before. It always had a hard time starting. We will have to hook up a FP gauge and see what it is getting. Can the governor springs be set to loose or tight and still cause a problem like even if the idle is at the correct RPM? It was my understanding that if the RPMs are correct at idle after the GSK install they are set correctly?

Will the piston lp slowly start to deliver less fuel or will it die all at once? I know with the stock diaphragm LP on a first gen they can slowly die but i thought that the piston LPs die all at once.

Tate

Your GSK is set up wrong. I'd back it off a click or two and adjust your idle to where you want it, then try again.

dodgetrucker75

what is the idle set at? sounds like it is low, it should be set at 800-850 with a/c on

Tate

His idle speed is fine by the sounds of it, the governor isn't reacting enough when put in drive. Backing off the tension on the springs, and resetting the idle should help it.