my 2001 5.9 overheats when pulling loads up hill and seems to be losing power. The injector pump was just replaced and the lift pump also. it doesn't use any coolant but it does smell like it is running rich or something. Any help out there?

 

well how much of a load are you pulling and how steep of a hill. If your diesel is dumping more fuel then needed you would have alot of black smoke... Whats your coolant temp?

 

2 things here ,check for any leaks in the boost pipes, intercooler,intake manifold cover gasket, the radiators on these trucks get plugged with grease around the fan area they need to be removed,sprayed with gunk, &pressure washed

 

delete your puke bottle and run a hose from the PCV to the axle, then wash the oil off your radiator... also does your cooling fan come on?

 

I m pulling a 26 foot toy hauler, about 9000lb up a 4% grade, it doesn't blow smoke so could it be running lean?

 

diesels are not like gasoline engines. too much fuel on a diesel makes excess heat. too much air on a diesel just cools them down and makes more power. boost at idle wouldn't hurt these engines. In fact it's been done before. Carl has a p-pumped 24v with a whipple charger putting 5psi boost at idle, and immediate boost out of the hole + compound twins to take over and bypass the whipple when it runs out of steam.


your problem will be with the cooling system. common problem is the PCV puts oil out into the catch bottle on the front of the motor, and if you don't empty that bottle every oil change like you are supposed to, then it fills up and overflows and then the cooling fan slings that oil all over the place and cakes up the radiator with it till it's completely blocked which causes an overheat.

other possibility is your thermostat is stuck closed which is rare unless its a non OEM t-stat in which case it is highly possible.

 

Also diesels do not run lean, if anything they miss, you can overfuel them because they do not get enough air, or fuel system issues. But that would be indicated by excessive black smoke..But your cooling systems needs checked.

 

Thanks for the info. I cleaned the gunk out of the radiator and it seems to be much better. Now if I could figure out the problem with my front hubs not locking in I would be happy as hell!!

 

Check all your vacuum lines to your front hubs.

 

vacuum lines to the front axle, or any vacuum leak in the system can cause enough vacuum loss to cause all sorts of vacuum related issues...

I have the lines for mine plugged off, and I use a posi-lok cable instead to manually engage the front axle from within the cab, which also gives me low range 2wd as an added bonus