I have a Question about the ISX VGT turbo.

I recently bought an 08" Pete 389. With a ISX @ 550HP I got the insite report from Cummins when I bought the truck. The truck had a new turbo put in On 5/9/11 and another one on 6/2/11. I bought the truck August 2nd. And Last Saturday the turbo failed again. This time it cost me. The truck didn't have any turbo failures until 272,000 miles. Now in the last 30,000 3 turbos.

What is the variable here? That the origional turbo would last 272,000 and than go through 3 in 30,000. I would speculate that the DPF needs cleaned but it's not full enough for the truck to have the clean dpf screen light up. What is the problem with these turbos that they have such a high failure rate? And it's not the impeller that's failing it's the VGT seizing on it.

Also I was getting close to 7 MPG with the old turbo. And now with this new one I couldn't get 5 MPG. So I wonder if the turbo that was on the truck when I purchased it, was bad from the get go. But in a good way LOL.

Is their anything that can be done to prolong the life of these turbos? I just bought one and still have warranty on the motor and new turbo. Till next year. But as soon as that expires it looks like it's going to PDI. If I can't get this problem straightened out.

I should also state that this is my first cummins having owned mostly Cat's till now. But didn't buy a newer truck with a Cat because I had heard that they were having so many problems with the DPF systems on them.

 

Selector shaft was frozen. With the turbo actuator off you couldn't move it. Cummins said it needed a new turbo. Without removing the turbo if you get what I'm saying. What is the cleaning procedure? Also how would I know if the EGR cooler is leaking?
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I cannot say for certain that it's the latest software. I guess I would need to go back to cummins. Would the software automatically update when they plugged the motor into INSITE? The truck was plugged in to pull the check engine code I had gotten. The code was for a Turbo Actuator. When I called Cummins he said that could be a 100 things. And wanted to know the actual code.

 

Not losing coolant. Nothing on insite report But I only have the repair history. I guess I will go to cummins and see about the parameters. When I get Home next week.

Does Cummins do the cleaning? Or do they just R&R the Turbo? And they deducted that I needed a turbo without removing it like I had said earlier. The Turbo was functioning I actually drove it to the dealer. I had a Check Engine light the day before and called and got an appt. Than the next day The code had cleared itself. No faults found is what the computer told me. I had this done at Cummins Cal Pacific by the way.

 

You may be right there. I didn't pay too much attention coming across AZ, NM and TX. But from louisiana to Florida. It took 20 PSI just to drive down the road with the cruise on. Granted I have a flat top truck and the peice on the top deck of my trailer had me at 13" 6" and I had about a 5 foot gap in the middle of the trailer between tarps. So those variables may have came into play. But now that I'm empty it's still taking 10-12 PSI just to drive down the road. This is with the new turbo by the way. So I am wondering what they didn't catch at the shop.

As far as the Exhaust back pressure sensor can it be removed and cleaned? Or does it need an R&R? Also where is it located. If it can be cleaned.