Van Wyk Inc.

Hey Hawk, another thing that just dawned on me is that it could be a broken flex pipe in the exhaust line before the DEF. These new engines exhaust is much hotter that pre EGR motors so they have a tendancy to burn out exhaust components. Can you smell exhaust in your cab? It may be worth it to grab a piece of cardboard and shinny under there to look around for any broken flex pipe or heavy carbon markings. Have you been going through an abnormal amount of oil since this started happening?

 

Rob, if it's coming out of a broken flex pipe wouldn't the truck be louder than usual? And the front of the right fuel tank, and the whole global warming filter "tin can" would be covered with soot.
Hawk, get under that truck and check it out, or have you already done that? Pop the hood and look around for black soot all around by the turbo.
How many miles are on this thing?

 

@Rob, yeah it has been above normal amount of oil... its not burning a whole hell of a lot of it but i've had to put around 2 gallons in the past two weeks to keep it about the add line.... the last i checked it it was quite far to the bottom of the add line..... again it only does it perodically on hard pulls, usually i can tell after ive been recently using the jake, and lasts for about 30 to 60 miles than goes away.....

i first started noticing this on the June 7th on 287 going to Norton, Ma and did from the tappen zee half through connecticut on 95....

then the next occurrence was on the 15th pulling hills on 81... did it all the way through scranton,

and then Sunday coming up hills on West Virginia started pouring out... i know it sounds maybe like a regen but it shouldn't pouring out that smoke like that, i doesn't lose power doing this nor do fuel mileage sucks... its just a #### mystery....

and that Prime comment i'm just going to leave it alone, obvious the person that posted didn't feel comfortable being up but ol well i just thought i speak on it if he was still around...

@I_Hate... i will do that in the foreseeable future and it has 263XXX

 

Make sure you describe the problem to Dean the same way you described it here in your last post. It's very more descriptive than your previous posts about it. Don't talk to Doug, just Dean.

 

in my search its showing flexplates are only used on Automatics?????

 

flex PIPES. Flexible sections of exhaust pipe.

Based on your description though I dont think that's the problem. It could still be a regen problem if there's something making it spray way too much fuel on the global warming filter during a regen. I remember the old espar heaters would make white smoke, so it's possible it could be excessive fuel being burned during a regen. OR, it's something else involving the pollution control systems.

These engines normally blow off oil. Deano said on many of these Cummins motors, you can't keep them at the full line and he recommended just making sure it's not below the add line. He said it's almost like the dipsticks are marked wrong and they'll blow off extra oil if you fill them above the add line. However he did say that when they do a B service, they always fill them to the "full" mark.

 

ok, when i'm slowing down and its in between 10 - 1200 RPM's and i give it fuel i hear this flutter/whistle and sometimes the truck wont even respond if i give it fuel but it will catch on and go..... only in between 10 to 12 rpm's in 8th gear so i've notice.... i also get that HEST light on the dash occasionally when it does this... man so many possibilities, i just hope someone can find the #### solution

 

How are you supposed to just whip into a KW dealer when you've got a typical VW freight schedule? You'd be talking repower, with some awful load you don't want, or you'll be sitting somewhere with an empty trailer and end up having to call a broker. My policy is if they don't give me time for repairs, I'll run it til something expensive happens, or I get to Sheldon, whichever comes first. (Unless it's something safety-related like brakes or tires)

That flutter/whistle sounds like turbo. On tractor 442 I actually had the turbo FALL OFF. I got to the shop and it was loose on the studs and Dean said there was only one nut remaining. No idea how it kept running that way, but it even had normal power. Just lots of whistling noise. One time it even took off on me when I was accelerating under full power with an empty trailer, dang thing was like hitting a nitro, next thing I know it was at 2200 RPM and I was afraid I was about to blow the thing up.

What the H is a "HEST" light? Is this one of the newer ones with the DEF tank? If that's the case I have no idea what the problem could be, there's about 5 or 6 extra cans of worms to deal with.

 

Naw, it's not a problem with the turbo...That flutter and whistle at low rpms when you get into the throttle is classic passive regen noise. If you're not pulling hard and then get into the throttle gently, you'll have some turbo flutter (warbley whistling) and a little hitch getting into the torque.

The HEST light should only come on at low speeds, though...they're programmed to warn you that the stack is super hot when it's likely that you're going to get out of the truck and touch it/be working near it. If the HEST light is coming on at speed something isn't right in the guts of the regen system (or in the computer).

Honestly? Maybe it's carbon build up in your DPF (like the old Espars when they got dirty and blew smoke) and you've got a bad fuel injector into the regen system. They inject fuel directly into the regeneration chamber to get the system hot to burn off the crap. If you're not getting the fuel in there, and the system is trying to passively regen, you might be getting a whole ton of messy carbonized crap blowing out of the stack instead of the clean, itty-bitty particulates you're supposed to wind up with.

Low-temp or incomplete combustion, basically.

Have you gotten the DPF warning light ever? (The one that indicates your DPF is dirty?) It's the other warning light that's listed on your sun visor.