running a large diesel engine at low idle speed causes low combustion chamber temps, which limits the engines ability to burn the injected fuel

this unburnt fuel leaves the combustion chamber and condenses/drops out of the exhaust flow and ends up dripping from exhaust manifolds and turbo down pipes, etc ..... ie - slobber

this unburnt fuel also passes the piston rings and causes cylinder glazing which generally requires engine tear-down to correct

 

If you look in the manual that came with the truck, odds are you will find instructions to the effect of not idling for more than five minutes, because low combustion chamber temperatures can cause a laundry list of problems.

They can, too. My old truck, I had no cruise, and no working manual throttle knob (that's a fun story in of itself) so I had to idle it at idle all night, for years. It got to where I would blow plumes of oil out the stack in the morning, because it was slobbering so much oil past the rings.

 

belive it or not, that makes perfect sense......from now on when I idle, I'll get the RPM's up a little higher........Thanks for the info everyone!!!

 

In the old days we had a knob that you pulled out and then the knob turned to get the idle up to where you wanted it

 

Was that back when the trucks had wooden wheels? :wink: :lol:

 

haha
I'm not THAT old

 

No, that was back when trucks could run with the ignition turned off.

I limped home a long way one night running my headlights off the battery, when my alternator took a dump. I'll never do that again.

 

You remember when the Truck stops sold that gizmo that attached to the Steering wheel(I think it went to the steering wheel) and had a rod with a tip that went to your Pedal and you set the Idle by adjusting a Nut? :P

Good Ole days lmao

 

:lol: funny you should mention that.....I have one of those back at home that used to be my dad's.......it has come in handy on more than one occassion when I was doing some work on my 4wheelers.

 

That's ok Yoopr, GMAN has a rotary dial cell phone.