I have had a few issues with my 7.3 here lately. Sometimes when I push the pedal down it is slow to respond but the engine is running but kind of muted. Then the power comes on strong and runs fine. Other times when I am slowing down the engine will drop a few rpms at idle then come back up, and just this morning I started the truck and while I was hooking up the trailer she just cut off. She won't start back up. NO smoke but I did think that my mileage was a bit down but I never crunched the numbers to really know, so take that with a grain of salt.
I have my thoughts on what it might be but I don't want to taint your opinion.

 

Standard questions...

Tuner?
Oil change?
Oil Level?
Year of truck, what Mods?
CEL on? ever come on.
Does your wait to start light come on?
Have you done the .50 mod?
Gages?

 

No smoke while cranking means there's no fueling going on. It's either an electrical problem such as a failed CPS, or you aren't getting adequate high pressure oil or enough fuel.

At this point, it would be a good idea to have a scanner hooked up to the truck while you crank. That way you can watch ICP to see what's happening. From this and previous threads, it almost sounds like you have a sticking IPR.

 

Ah Sorry I just assumed,
No tuner, oil changes 3500 ago, 99 model mods> 4 inch exhaust, the start light does come on, have not done the 50 mod, gauges just got here and are sitting on the counter. I might put then in my newer truck instead,

 

what is a ipr?

 

Stole this from another thread

IPR: Injection Pressure Regulator
Output; The PCM controls the high pressure oil system by varying the duty cycle of the IPR. The IPR controls the oil bypass circuit of the high pressure pump. 0%=full return to sump (open valve), 100%=full flow to injectors (closed valve). The PCM monitors the system with the ICP input. The PCM can control fuel delivery to the injectors by increasing the IPR duty cycle which increases fule pressure through the injector nozzels. PID: IPR (% of duty cycle), MFDES Mass Fuel Desired an internal PCM calculation based on load demand (MG)

 

It's the injection pressure regulator mounted on the bottom of the HPOP. It regulates the high pressure oil that feeds to the injectors. If it sticks, it won't build oil pressure in the rails at the injectors, so the injectors won't fire.

By having a scanner handy, you can watch ICP to see if it builds pressure.

 

Dang, I don't have a scanner available. I tell ya, trading this truck is looking better and better. What is it going to cost if I have to replace the IPR?

 

Is the fuel bowl full of fuel?

 

Let me go check

 

Sounds silly, but check your oil level while you're at it.

 

Correction in my earlier post. the wait to start light does not come on, the fuel bowl is full and the oil level is ok

 

I did a search and it told me that the fuel bowl heater was the issue. unplug the heater and change fuse number 30? where is this fuse at?

 

Shoot, under the dash if I remember correctly.. Yeah, you are on to it !! IF the wait to start dont come on, you got her. If not, then you may have a loose connections or corrison going on somewhere, but hopefully the heater and fuse you will be done.

 

will replacing the fuse fix it or do I have to do the fuel bowl heater too?