Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Cummins Engines
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-26-2020, 10:10 AM   #1
Member
 
Join Date: May 2020
Posts: 47
New turbo for 2005 Monaco with ISB engine?

Hi;


My Monaco DP has 255 counts of a 2388 code. This appears to mean that the turbo (wastegate?) actuator isn't rotating enough. They suggest I replace the turbo ($4,600 + 16 hours labor = ~$7,000). I believe this is the ISB engine in either a 275 or 300 HP configuration.



So, questions:


1) Is there a way to loosen up the actuator rather than replacing the whole thing? Could it be stuck after sitting for two years and might actually fix itself after running it normally for a while?



2) What are the likely consequences of not replacing it?


The boost gauge is going from zero to over 30 PSI of boost pretty smoothly, so it's getting enough boost. From tuning VW's, though, I know too much pressure can be a bad thing. What's the limit on these turbos?


TIA,


David
IWander is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-26-2020, 10:21 AM   #2
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 24,240
I can't be sure if this thread has any info that could be of use , being a newer version of the ISB. But it might be worth a read .
JMHO: For $7,000 I'd be tempted to drive the coach , over boost should set codes and cause the engine to de-rate before there is any damage.

EDIT: A second JMHO 16 hour quote for a turbo replacement is their ," we'll work on your coach for a price quote " if you do decide on replacement , shop around for price on the turbo and labor charges , 16 hrs. would strike me as being double the time involved . I know every engine and coach will have different access issues , but I had my turbo off in well under 3 hrs. to remove a broken fitting for my waste gate actuation pressure hose . The fitting had been damaged when the engine was lowered into the chassis and the motor survived 11 years and 62,000 miles with the waste gate not operating , I'd driven the coach 7,000 miles myself , and didn't notice any problems , spotted the damage while changing the oil filter.


http://www.irv2.com/forums/f123/2008...ht-338508.html
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 06-26-2020, 10:27 AM   #3
Senior Member
 
Join Date: May 2019
Posts: 164
You probably have the same Cummins 5.9 ISB common rail engine that I have. I would be tempted to check the waste gate movement, replace the actuator, and if that didn't work. Pull the turbo for rebuild. This is easier or harder based on access to your engine. Good Luck.
__________________
2003 Rexhall Vision DP
RVingNow is offline   Reply With Quote
Old 06-26-2020, 10:45 AM   #4
Senior Member
 
Join Date: Jul 2019
Location: oregon
Posts: 522
Since we have a 2005 HR it is time for me to get up to speed on diesel...So I've done some snooping...

https://www.justanswer.com/heavy-equ...here-near.html

https://www.justanswer.com/heavy-equ...motorhome.html

https://www.irv2.com/forums/f123/vgt...ms-329787.html

as to boosting a cummings, they can be modified to the point of insanity..and you always have your foot on the pedal and your gauge to read the pressure... keep in mind they are extremely costly to fix once broken.
EyezOpen is offline   Reply With Quote
Old 06-29-2020, 05:09 PM   #5
Member
 
Join Date: May 2020
Posts: 47
Update: On picking up the MH I talked with the service department a little more. They reset the codes before taking it for a drive checking the alignment. The check engine light didn't come on while they were driving it, nor have I seen it in my limited driving of it since I got it back.
IWander is offline   Reply With Quote
Old 06-30-2020, 10:46 AM   #6
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 24,240
Drive it like you stole it!

I think this is a carbon build up issue , and getting on the road and working the engine is the best thing for it , idle time is the killer.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 07-14-2020, 12:33 AM   #7
Registered User
 
Join Date: Jul 2014
Posts: 795
IWander: Did you get a new turbo? Do you have a Holset-40W or a newer style turbo?

This subject has been talked about a lot in this thread about ISC-350 boost in 2004 and earlier coaches, where we are trying to disable the turbo actuator to increase our boost to 30PSI.

So if you are getting 30PSI you probably are enjoying better performance and maybe lower EGT numbers.

...And the only thing you have to live with is knowing you ECM is flashing high counts of over boost. So can you turn that option off using the Cummins Insite Programmer? ...Ask your mechanic and let us know what you end up doing?

Alternatively, maybe your engine has a speed sensor that is picking up these faults? If so, maybe you can fool it somehow?
Attached Thumbnails
Click image for larger version

Name:	Turbo Diagram + Charge Air Cooler (CAC).jpg
Views:	34
Size:	76.6 KB
ID:	293059   Click image for larger version

Name:	Cummins Engine Air Flow Diagram.jpg
Views:	34
Size:	56.6 KB
ID:	293061  

Attached Images
 
imnprsd is offline   Reply With Quote
Old 07-15-2020, 04:54 AM   #8
Member
 
Join Date: May 2020
Posts: 47
Quote:
Originally Posted by imnprsd View Post
IWander: Did you get a new turbo? Do you have a Holset-40W or a newer style turbo?

I don't know what kind of turbo I have. At six or seven grand to replace it I'm going to need to see a problem beyond a check engine light before I tackle it. Also I'm heading to San Diego in a few days and don't have the time to do anything with it now.



I'm pretty sure it's a matter of carbon buildup, and am hoping active use of the exhaust brake and running it hard on some hills will clean it out.



Thanks for all the pointers,


David
IWander is offline   Reply With Quote
Old 08-12-2020, 02:01 PM   #9
Junior Member
 
Join Date: Feb 2019
Posts: 14
Quote:
Originally Posted by IWander View Post
I don't know what kind of turbo I have. At six or seven grand to replace it I'm going to need to see a problem beyond a check engine light before I tackle it. Also I'm heading to San Diego in a few days and don't have the time to do anything with it now.



I'm pretty sure it's a matter of carbon buildup, and am hoping active use of the exhaust brake and running it hard on some hills will clean it out.



Thanks for all the pointers,


David


Had similar issue with my 6.7 Cummins. It appeared carbon buildup caused actuator and turbo problem. Original owner noted the issue but did nothing, noting only check engine light when under load. I chose to replace actuator and turbo for $6000 and no more problems. Prior to changing, I did try having actuator changed and turbo cleaned. For me this didnít fix problem.
RRGarcia626 is offline   Reply With Quote
Reply

Tags
engine, monaco, turbo



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
ISB Cummins 5.9L Turbo Sticking jzielins Cummins Engines 67 09-11-2013 06:56 AM
Cummins ISB Twin Turbo Kit Brazel's RV Performance Cummins Engines 16 11-17-2012 10:41 AM
Just purchased 2006 Dodge Ram 2500 w/5.9 ISB 6 cyl Turbo Diesel first5thwheel 5th Wheel Discussion 21 03-06-2012 06:36 AM
Cummins isb 275hp turbo whine JBDISCOVERY Cummins Engines 9 04-29-2011 07:04 PM
5.9 ISB Turbo Question BlueLine Cummins Engines 11 01-06-2011 08:05 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 06:10 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.