tesla440

I have a '05 that seems to be having engine stumble & fuel issues. I've only noticed this since the cold weather has hit in WI. Whenever I start the truck up & my voltage is about 13vdc, I have low fuel pressure, (3-5 psi running, 1-3 before starting). I get the same low pressure & voltage after I've run at operating temps, stop & restart the truck. The fuel pressure will come up to 7-8 psi usually after the intake heater shuts off (approx 20mph) where the voltage will go to 14-15vdc & I've driven about 1 mile.

Does any one else see the same thing?

The low fuel pressure doesn't bother me as much as this occasional engine stumble that throws a P0192 (low fuel rail pressure) [that is the only code that shows up]. I can't do it all of the time, but it usually happens when the truck isn't warmed up or a very short trip & the fuel pressure is between 4-5 psi. It has only thrown the code about 5 times now. The dealer said that they will not do anything since the MIL keeps going off after X number of starts.

I originally thought that the engine stumble was caused by the low fuel pressure. But since the last time the truck stumbled & threw the P0192 that my fuel pressure wasn't coming up to the 8psi (still around 4-5psi). I changed my fuel filter. That seemed to clear the fuel pressure issue not going up to the 8psi.

I've talked with Roark at Quad about this stumble & we both are still stumped. I can't repeatively cause this stumble.

But after this last stumble I did some more investigating. One thing that I noticed I have a slight stumble at idle that is independant of voltage & fuel pressure. There is also an occasional (for lack of a term) injector pinging at idle. I can hear the my valves need to be adjusted. I also checked the oil level which has not moved. So I don't think that I have a cracked injector (but could be wrong). One thing that I have noticed is that the truck now sounds more like a Gen 2 engine than a Gen 3 since the last engine stumble with the thrown code.

I have religiously used 16oz PS during every fillup for antigel during winter & to help clean the injectors.

Sorry for the long winded post, but I figured more info I gave up front would help. I would like just to get to the bottom of this issue. Any help would be greatly appreciated.

JThiessen

My truck has just recently started with 0192 codes as well as 0116 (coolant temp low voltage - where the Commander plugs in for water temp). I also feel that cold weather is having some kind of effect, in some way. Are you getting the occasional stumble right after start up?

I dont know what the fuel pressure is on mine yet, since I havent found a soulution to installing that fuel pressure sender with the Jake Brake.

ptgarcia

Have you checked the connections on the Quad harness? My truck was doing something similar and it turned out to be a cracked plug on the Quad harness where it plugs into the fuel pressure sensor.

reb0957

I haven't had any stubble issues since I have switched to NORELCO!

OK SORRY I JUST HAD TO DO IT!

belgianmagic

I DON'T GET IT ...lol