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blkdodge

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Posted: 10/30/14 01:34pm Link  |  Quote  |  Print  |  Notify Moderator

Anyone ever hear of a turbo getting ("coked up" dealer term)?
I lost a lot of power and massive drop in MPG while towing to Co.
Took truck 2012 3500 drw dodge to dealer and they had it for 3 days.
They say they flushed the turbo and it runs fine now.
How can this be prevented in the future and what causes this issue?

Any thoughts?


2012 Dodge 3500 DRW/2012 Heartland Landmark San Antonio.


darsben

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Posted: 10/30/14 01:41pm Link  |  Quote  |  Print  |  Notify Moderator

[image]

Coked up EGR valve

Coke = carbon
decnt article here

* This post was edited 10/30/14 01:55pm by darsben *


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Bedlam

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Posted: 10/30/14 01:44pm Link  |  Quote  |  Print  |  Notify Moderator

Excessive idling, long periods of slow speed driving or over fueling the engine will cause coking of the turbine. If the oil was cooked, it is due to running the turbo hard and shutting down before the circulating oil has a chance to cool down the turbo. What oil is left in the turbo gets overheated and breaks down.

This was something I warned about with my variable geometry turbo on the 6.0 PSD. I tried to avoid the above conditions and never had problems.


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2oldman

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Posted: 10/30/14 01:46pm Link  |  Quote  |  Print  |  Notify Moderator

Google or Youtube: coking turbo

Be thankful you found an honest shop that didn't sell you a new turbo.

donn0128

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Posted: 10/30/14 01:46pm Link  |  Quote  |  Print  |  Notify Moderator

Yup! Common problem. Run with the EB on all the time, dont lug the motor, dont drive in town traffic without getting it on the highway and driving it hard for 20-30 miles every week.
Either that or do the delets, which of course the federal government deemed illegal.


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spoon059

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Posted: 10/30/14 02:10pm Link  |  Quote  |  Print  |  Notify Moderator

Hilarious picture, from Chapelle Show. That's more referring to dry ashy lips that are burnt from a crack pipe.

Sounds like an honest mechanic, lucky you. This is the downfall of diesel vehicles for daily drivers with relatively short commutes. Glad you got it fixe, hopefully it was inexpensive for you.

I had an old GM 3.2 motor that had a problem with carbon buildup on oil drain lines somewhere in the engine. Oil couldn't properly drain back and would burn off and I would be short about a quart and a half between oil changes.

The suggested fix by other owners of the same engine was to use Seafoam in the oil before changes and suck up some Seafoam in the brake booster. Something in the Seafoam was good at breaking down the carbon buildup and freeing up those passages. Don't know how it worked... but it worked. No more oil being burned.

Not sure if there is some similar tip for you. Find a Cummins forum and see if anyone has suggestions. Good luck!


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blkdodge

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Posted: 10/30/14 02:22pm Link  |  Quote  |  Print  |  Notify Moderator

The dealer didn't charge for it because it fell under the 100k warranty. I do a lot of stop and go driving every day. Freeways here suck. 1.5 hours to drive 37 miles. So I guess there really isn't anything I can do to prevent this, except park it. [emoticon]

downtheroad

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Posted: 10/30/14 02:41pm Link  |  Quote  |  Print  |  Notify Moderator

Bedlam wrote:

Excessive idling, long periods of slow speed driving or over fueling the engine will cause coking of the turbine. If the oil was cooked, it is due to running the turbo hard and shutting down before the circulating oil has a chance to cool down the turbo. What oil is left in the turbo gets overheated and breaks down.


Only Dodges have this problem.....

Seriously, good explanation here from Bedlam.


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ChooChooMan74

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Posted: 10/30/14 04:13pm Link  |  Quote  |  Print  |  Notify Moderator

I didn't know dodge made trucks any longer...

In all seriousness, do you idle your truck before shutting it? Oil coking in the turbo is bad. My diesel tech is adamant about it. I wait to my pre turbo EGTs is below 300.


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donn0128

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Posted: 10/30/14 04:50pm Link  |  Quote  |  Print  |  Notify Moderator

ChooChooMan74 wrote:

I didn't know dodge made trucks any longer...

In all seriousness, do you idle your truck before shutting it? Oil coking in the turbo is bad. My diesel tech is adamant about it. I wait to my pre turbo EGTs is below 300.


Actually from the picture it is not coking but rather soot inside the turbo. This is common of a truck that is used as a commuter car and not used as a work tool. Which is exactly what the OP is doing.

To the OP, You really need to park the truck and get a small car for commuting to work. Otherwise you will be back at the dealers again in a year or two

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