Oddball issue I can't figure out...yet anyway...or maybe never...I do that.

[ToddMcMilian]

Today on the way home after about 130 miles of driving and thankfully only about 2 miles from home, my truck lost its mind. I had just topped a hill and it pulled fine, nothing out of normal and as I coasted to a stop sign, I noticed all the sudden it was making much more exhaust noise, surging and when I checked my Edge insite, I had zero boost. I left the stop sign and it never made boost until I gave it a little extra and it made a whooping 1 lb and returned to zero. It was not smoking and other than losing power and being noisy, it let us get home and didn't strand us. No codes present when I ran codes. I checked all the pressure boots and didnt feel a hole or find anything loose. My son said he noticed it smoked a bit each time I started it, just normal black smoke and it didnt continue...just a puff when it fired up. There is no sound of spooling unless I give it a quick blip on the throttle and then its barely noticeable. Turbo was replaced about a month ago since vanes were hanging up, so its same as new.

I thought I smoked the turbo but from what I am gathering, I should be seeing it really smoking heavily, esp on my drive home and that is not the case, its just abnormally loud and semi gutless. I checked rail pressure and I have 4.8 at idle, 5.2 at 1000 and 7.4 at 1600 rpm.

Truck is an 08 6.7 fully deleted, with efilive. I removed my edge and cp5 switch to make sure for some reason one of those hadn't gone nuts...no change.

Thanks for any help you can provide!

 

[RDThompson]

Without hearing or seeing the unit, the only thing I can think of based on the description is a stuck slider in the Turbo. Or possibly an electronic problem. in either case it should be generating codes. I guess your first job is to scan for codes and then review. Was the engine brake on at the time?

 

[ToddMcMilian]

Howdy, I towed it to the shop after trying and testing the things I could. They threw a scanner on it and it was making boost at high engine speed but when it was above idle to fairly high rpm, it didn't do a thing...vanes are apparently hung up. They will get with the mfg and get me a new turbo so hopefully I will get the truck back next week. As far as the exhaust brake question Bob, I wasn't running it at the time but had used it prob 2 hrs prior and all was fine. The exhaust brake isn't working at all now. I guess I will start running it all the time or at least much more often. I use to run it all the time on the last turbo because it was throwing codes so using it along with a good highway run or two would keep the code away. I did my deletes and then immediately took the truck in to get the turbo replaced. Once I got the new turbo and with it being deleted, I stopped running the brake very often. I think I will return back to using it cause the who turbo failing ordeal sucks.

 

[ToddMcMilian]

Just an update, turbo was toast. Got the new one on and all is well. New turbo has a different personality than the last but it's making boost and seems to be good to go.

 

[RDThompson]

Glad you got it sorted. I am not qualified to judge the effects of deletes on the turbo. The E brake seems to thrive from constant usage though, I guess it keeps everything moving in the turbo so there's less chance for carbon to build up.