Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 10-11-2015, 01:24 PM   #15
Senior Member
 
Steve Ownby's Avatar
 
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,399
Quote:
Originally Posted by FreedomDream View Post
Take it to Cummins certified service center who can check turbo boost, read codes and check over all performance. Make sure you tell them about the manifold work you had done and who did the work. They may nee to check to see if correct part was installed. Good luck.

Since your original post says that the performance loss was "immediately noticeable" then it should be assumed that the work performed is suspect. FreedomDream is correct about the direction forward.


Steve Ownby
Full time since '07
__________________

__________________
Steve Ownby
Full time since 2007
2003 Monaco Signature
Steve Ownby 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 10-11-2015, 01:28 PM   #16
Junior Member
 
roadwarriorz's Avatar
 
Monaco Owners Club
Join Date: Aug 2010
Location: Anaheim Hills, CA
Posts: 14
I also agree something is wrong. My 34,000 lb. Diplomat with 400 hp ISL would also climb a long 6% grade (Cajon Pass) at 60 mph...
__________________

__________________
2009 Monaco Diplomat PDQ
roadwarriorz is offline   Reply With Quote
Old 10-11-2015, 08:06 PM   #17
Senior Member


 
Join Date: Sep 2013
Posts: 1,835
Not much info in your post? Year?

The 400ISL don't have a waster gate. It is a variable geometry turbo. You mention manifold? Exhaust manifold? Has the turbo been reinstalled?

L.
__________________
2008 Thor Mandalay Presidio, 400 ISL
RVing since 1974!
Lots of Motorcycles
Lloyd in S.C. is offline   Reply With Quote
Old 10-12-2015, 11:11 AM   #18
Senior Member
 
Smitty77's Avatar
 
Join Date: Aug 2010
Location: Over the next hill, around the next curve...
Posts: 3,312
Quote:
Originally Posted by Lloyd in S.C. View Post
Not much info in your post? Year?

The 400ISL don't have a waster gate. It is a variable geometry turbo. You mention manifold? Exhaust manifold? Has the turbo been reinstalled?

L.
His profile reflects a 2004 American Dream. Very possible this is the CAPS era ISL, not Common Rail with Variable Geometry Turbo. Only way to know for sure, is to have the build checked vis SN with Cummins.

I know this how? Well a bit sheepishly, I admit I drove our coach for well over a year, before a conversation with Cummins Tech Support on another issue, revealed my coach had the CAPS era ISL. The engine was built in July of 2003, and the coach was built in Sept of 2003, as a 2004 model year. It was on me, to validate that I was getting the newer engine, that I desired.

X's 2 on going in and getting it tested with the computer reading codes.

Please circle back and let us know how it tuns out. And, best to you,

Smitty
__________________
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
Smitty77 is online now   Reply With Quote
Old 10-13-2015, 04:26 PM   #19
Junior Member
 
Join Date: Oct 2013
Posts: 12
I agree that you need to have Cummings put it on a dynamo machine. We had problem with our Allegro Bus 330 Cat loosing power around Salt Lake City. We had replace fuel and air filters before we left on trip. That was first thing Cummings checked when we took it in. I had them put it on dynamo after everything else checked out. It turned out that the fuel filter housing had a hair line crack and as the engine was put under load and heated up the crack would open and allow air into the fuel system and caused a loss of power. Coach ran great after new fuel filter housing replaced. In other words problem would probably never have been found if it had not been put on the dynamo.
__________________
jdbunch0924 is offline   Reply With Quote
Old 10-13-2015, 10:13 PM   #20
Senior Member
 
Rich-n-Linda's Avatar
 
Join Date: Nov 2011
Posts: 884
The company name is CUMMINS, not CUMMINGS!


2006 Mandalay 40E, Cummins ISL 400 HP
__________________
Rich-n-Linda is offline   Reply With Quote
Old 10-20-2015, 08:56 AM   #21
Senior Member
 
Join Date: Aug 2015
Posts: 162
I believe you may have a bad lift pump. Lift pump on 400 ISL should have 5 lbs pressure.
I experienced the same symptons with loss of power on hills. My lift pump was only putting out 1.5 lbs pressure. Changed it and all good.
Also you may have an additional in line fuel filter along frame. I don't know exactly where its located ,[my Endeavor does not have one ] I just heard of a guy that had similar restricted fuel problems and the shop changed everything...........until another shop found the filter that was indeed the culprit.
__________________
RIDER FAN is offline   Reply With Quote
Old 10-20-2015, 02:18 PM   #22
Senior Member
 
ru499's Avatar
 
Join Date: Dec 2010
Location: Tuckerton, NJ
Posts: 153
Quote:
Originally Posted by Rich-n-Linda View Post
I have the 400 hp ISL in a 34,000 pound coach. I routinely run 5 and 6% interstate grades in 5th gear at 65 mph and 2,000 RPM.

40 mph is way too slow. Something IS wrong.

I agree. My400 ISL pulls our 3400 lb car up 7% grades holding 55 mph in 5th gear.
__________________
2005 Itasca Horizon 40FD
FMCA 428291
ru499 is offline   Reply With Quote
Old 10-20-2015, 02:41 PM   #23
Member
 
Wilkiesr's Avatar
 
Monaco Owners Club
Join Date: Aug 2009
Location: Elon N.C.
Posts: 53
Do you see any black smoke when it gets down to pulling hard?
__________________
Wilkiesr is offline   Reply With Quote
Old 10-20-2015, 05:46 PM   #24
Senior Member
 
Sky_Boss's Avatar


 
Newmar Owners Club
Spartan Chassis
Join Date: Apr 2012
Location: ON THE ROAD...SOMEWHERE
Posts: 6,072
Where does someone get a dyno? I've been told by a couple places they won't dyno a loaded chassis.
__________________

__________________
Don, Sandee & GSD Zeus. Guardian GSDs Gunny (7/11/15) & Thor (5/5/15)
2006 DSDP 4320, Spartan MM IFS, 2013 CR-V, Blue Ox Avail, SMI AF1, Samsung 197R Refer.
Sky_Boss is offline   Reply With Quote
Reply

Tags
power



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
Are Cummins fuel and air filters the same? 350 ISL. compared to 400 ISL ? DGBPokes Cummins Engines 4 06-04-2015 06:40 PM
Flashing ISL 400 ? britcon Cummins Engines 1 11-12-2014 05:23 PM
ISL 400 Exhaust Manifold Bolt Torque Specifications? nodine Cummins Engines 2 11-06-2014 06:39 PM
TS Power Play Tuner for Cummins ISL 370hp CAPS Pushinacoach Cummins Engines 5 10-31-2014 11:24 PM
Loss of power momentarily ISL 380 Bill2 Cummins Engines 5 06-14-2014 03:53 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:45 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.