7.3L circa 2002 90k miles Has always run strong, proper maintenance etc... Run Hypertech Stage 3, tows less than 5000 lbs on occasion.

Two weeks ago, oil leak discovered, taken to stealership, replaced turbo o rings fixed "tube" leak. Other than oil leak no prior problems, no DTCs.

Drove 440+ miles with a couple of 10 minutes stops towing 5000lbs max. Ran at about 2100 RPMs continuous for an hour or more at the time. No trouble noted.

Return trip, drove about 80 miles and stopped to fill up. (first since leaving, has a 48 gallon tank) About another 50 miles down the road the truck began vibrating, bouncing, loud, loosing power. If I backed off to slow down it would smooth out and sound right, if I tried to accelerate it would convince you the engine was about to drop out. Steering wheel and dash vibrating like driving over a serious set of rumble strips.

Pulled over for about 15 minutes, checked everything, no oil leaks, oil full, nothing excessively hot etc... I did drain the water sep.

Back on the road everything seemed OK for about 30 miles. Then a repeat. About 10 minutes to drain the sep and look around.

Another 30 to 40 miles, repeat. I pulled into a station this time, purchased Diesel Kleen with the water dispurser, poured in a whole bottle and topped the tank with another 20 gallons of fuel.
Checked DTCs = P1249 and P0603 cleared

We came another 150 miles without incident until the last 10 miles. Then it was very very faint. Drained sep and DTC = P1249 cleared.

The truck ran a couple of times this week, short trips, no load, no problems, no codes.

This morning with aobut 1000 lbs in the bed I ran the truck wtih Overdrive off, sustained 2100 RPMs for 10 miles, punched it a few times HARD. Red lined a couple of times, the turbo dumped twice (now that I know what that is) and backing off returned everything to normal. No perceived problems. HOWEVER, DTC = P1249


Could it simply be bad fuel?
Could something the stealership did be the problem?
Could the stage 3 Hypertech programming be the problem? ( I did update the hypertech code a couple of months ago)
Could a vaccum leak be the problem?

I don't want to just hit the road again with a trailer and the problem recur 50 miles down the road.

Ideas?


/RB

 

dont know if this will help, here are the codes, http://www.dieseltalk.com/support/DTC.pdf

 

Did you forget to put a 1 or 2 in front of that "90k miles" ????

 

On a serious note what CPS are you running???

 

No 1, No 2, straight up 89,456 miles. In earnest, no cheating. It covers about 10 to 15k per year and when I need a truck I NEED at least this truck. I've even overloaded it a few times. Normally a 5000 lb tow load or 2000 lb in the bed would be typical. I have towed more than it's rated capacity to FL and back... several times.

At least twice, the first CPS replaced was done by the stealership when it had about 20k on it or less they decided it needed it. That one failed and I replaced it with a stealership purchased CPS at around 40k miles.

Now that I think about it the truck did buck when the last one failed but it went to non-functional (idle only) so fast I didn't get time to enjoy the rough ride.

Is there a better CPS to install rather than going to the stealership?

/RB

 

A Gray CPS from the dealership CAN cause a rough running issue. Even an intermittent one. I am running a Standard Motor Parts (SMP) CPS and have had alot of good luck with it. ALOT of people are very against store bought CSP's. But it is a cheap and easy place to start. And like i said i have had good luck with it.