'99 doesnt want to idle in gear

Turbo · 01-29-2007, 09:29 PM

An employee of mine has a '99 with about 165k complete stock. His truck started dieing if he came to a stop, letting the rpms drop far enough with a load on the motor(auto trans), the truck would die. If you start it back up it will run, and idle. The moment you put it into gear the idle drops and surges. If you give it gas or drive it and let off again it dies. What should we look at that may be causing this? Maybe a fuel supply issue? He doesnt have a pressure gauge, which I suggest he get one, so we dont know what the fuel pressure is doing.

Any help is greatly appreciated.

__________________
Justin Harris
Justin Tyme Autocraft
2000 2500 SLT Laramie Quad LWB - PICS

Oregonpharmer · 01-30-2007, 08:27 PM

I would start by changing the fuel filter, then check the fuel pressure on the outlet side of the filter.

A bad transfer pump will do as you describe, but so will a bad injection pump, or a fuel hose that is leaking air into the fuel, crud in the in-tank pickup tube screen, or even a bad overflow valve.

The best thing is to make sure you have a clean filter, have primed the truck, and then test the fuel pressure.

It is also a good idea to dump the error codes and look for an injection pump related error.

GottSoot · 01-30-2007, 08:33 PM

yeah get a fuel pressure reading right away, so he knows if the VP is starving.

__________________
Billings Mt. Home of the Dirtymax!! 9.46 149MPH

01-29-2007, 09:29 PM	#1 (permalink)
Turbo Cummins Fanatic Join Date: Jun 2006 Location: North Texas Posts: 101 Turbo's Truck Pics	'99 doesnt want to idle in gear An employee of mine has a '99 with about 165k complete stock. His truck started dieing if he came to a stop, letting the rpms drop far enough with a load on the motor(auto trans), the truck would die. If you start it back up it will run, and idle. The moment you put it into gear the idle drops and surges. If you give it gas or drive it and let off again it dies. What should we look at that may be causing this? Maybe a fuel supply issue? He doesnt have a pressure gauge, which I suggest he get one, so we dont know what the fuel pressure is doing. Any help is greatly appreciated. __________________ Justin Harris Justin Tyme Autocraft 2000 2500 SLT Laramie Quad LWB - PICS

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01-30-2007, 08:27 PM	#2 (permalink)
Oregonpharmer Tech Specialist Join Date: May 2006 Posts: 186 Oregonpharmer's Truck Pics	I would start by changing the fuel filter, then check the fuel pressure on the outlet side of the filter. A bad transfer pump will do as you describe, but so will a bad injection pump, or a fuel hose that is leaking air into the fuel, crud in the in-tank pickup tube screen, or even a bad overflow valve. The best thing is to make sure you have a clean filter, have primed the truck, and then test the fuel pressure. It is also a good idea to dump the error codes and look for an injection pump related error.

01-30-2007, 08:33 PM	#3 (permalink)
GottSoot Cummins Enthusiast Join Date: Jan 2007 Location: Montana Posts: 216 GottSoot's Truck Pics	yeah get a fuel pressure reading right away, so he knows if the VP is starving. __________________ Billings Mt. Home of the Dirtymax!! 9.46 149MPH