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Old 04-21-2017, 08:22 PM   #1
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No power, no boost, black smoke...

Today I was driving home from a 600 mile trip in our 08 Holiday Rambler Endeavor and I noticed a lack of power and low turbo boost. I could only develop about 15-18 pounds of boost as opposed to the 35 or so I usually have.
I had to floor the accelerator to get the coach moving and I noticed a moderate amount of black smoke from the exhaust as I accelerated.
I've never had these issues before... the engine has always run excellent with good power until today.
I am not hearing anything out of the ordinary and it seems to run as smoothly as ever.
I just had it serviced and new fuel filters etc. about 800 miles ago.
I always buy fuel from high volume truck stops, but it's always possible to get hold of some bad fuel I guess.
The engine is a 2006 Cummins ISL 400 horsepower. No DPF or DEF.
Any thoughts or ideas? I'm going to try to get the codes, if any have been thrown.
Thanks everyone. Brian.
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Old 04-21-2017, 08:29 PM   #2
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Boost leak somewhere. Or the turbo is on it's way out.
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Old 04-21-2017, 08:29 PM   #3
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Check all the flex connections in the intake system, attachments from turbo to CAC , and CAC up to the intake , for splits or broken clamps .
I hope that is your problem . Other low boost issues can get $$$.
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Old 04-22-2017, 08:06 AM   #4
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Stuck Exhaust brake valve, I had same issue, pin holding push rod fell out leaving valve closed.

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Old 04-22-2017, 08:08 AM   #5
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One point people are not aware of is that there's a hose that runs from the bottom of the air intake manifold on the side of the motor that goes down to the air compressor. This hose supplies clean filtered air to the air system. If it develops a hole you'll lose boost/power. Been there done that thing.
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Old 04-22-2017, 08:17 AM   #6
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Quote:
Originally Posted by 92TNTRacing View Post
Boost leak somewhere. Or the turbo is on it's way out.
This ^^^^^would be my guess - Black Smoke means not enough Air or too Much Fuel.

JMHO,
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Old 04-22-2017, 09:31 AM   #7
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Quote:
Originally Posted by D Lindy View Post
One point people are not aware of is that there's a hose that runs from the bottom of the air intake manifold on the side of the motor that goes down to the air compressor. This hose supplies clean filtered air to the air system. If it develops a hole you'll lose boost/power. Been there done that thing.
I kinda noticed that hose is not only very long but hangs down more than most others ( I guess bc how it has to run).. Seems like a potential problem..
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Old 04-22-2017, 10:01 AM   #8
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Thanks everyone for the ideas on what to look for. I really hope that it's not something too expensive. The coach has been well maintained and only has 51,000 miles so I really hope it's not the turbo.
The exhaust brake seemed to work normally on the way home yesterday but maybe I'll take another look at it.
I really don't want to take it to the shop at $135. Per hour but unless I can spot something obviously wrong I won't have a choice.
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Old 04-22-2017, 11:34 AM   #9
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According to my Scan Gauge D, I am showing one fault code....

ID FM CNT
627 04 127

I have searched for Cummins ISL Fault Codes online but I'm not finding this code...
anyone have a good set of fault codes for a 2006 Cummins ISL?
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Old 04-22-2017, 02:43 PM   #10
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Call/email Linear Logic. FM 04 is low voltage. CNT 127 is the count. Don't know what 627 is.
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Old 04-23-2017, 11:17 AM   #11
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Well I have an appointment at the shop on Friday... hopefully they can find out what is wrong and get it fixed instead of guessing and throwing parts, (and money) at it. I've used this shop before and they have a good reputation. They do a lot of work on motorhomes. Some shops around here don't want anything to do with motorhomes due to lack of access to the engine... can't say I blame them.
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