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 03-26-2017, 11:09 AM   #1
Senior Member
 
Rburian's Avatar
 
Join Date: Jul 2011
Location: Naples, Florida & Cape Cod, Ma,
Posts: 546
Low Turbo Boost and Exhaust brake performance

What would cause both low performance on Turbo and exhaust brake, ISL 400 2005 HR Scepter? The Exhaust brake piston (new upgrade)is activating, but does not seem to slow down coach.
__________________

Rburian 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 03-26-2017, 11:18 AM   #2
Senior Member
 
GraySeal65's Avatar
 
Country Coach Owners Club
Join Date: Jun 2013
Posts: 608
Quote:
Originally Posted by Rjburian View Post
What would cause both low performance on Turbo and exhaust brake, ISL 400 2005 HR Scepter? The Exhaust brake piston (new upgrade)is activating, but does not seem to slow down coach.
I would check the butterfly valve on the brake, sounds like it is stuck closed.
__________________

__________________
1997 Country Coach Intrigue Horizon 36' (The Dinosaur Burner)
GraySeal65 is offline   Reply With Quote
Old 03-26-2017, 11:31 AM   #3
Senior Member
 
Bigd9's Avatar


 
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 5,521
Could also be a leaking exhaust pipe between the turbo and the exhaust brake.

And what do you mean by "Low Turbo Boost"? If you actually mean no acceleration then you may have a exhaust leak before the turbo since it is the exhaust gases that spin the turbo.

But like 92TNTRacing indicated, my first area to look at is the actual valve inside the exhaust brake unit.
__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
Bigd9 is offline   Reply With Quote
Old 03-26-2017, 11:32 AM   #4
Senior Member
 
Rburian's Avatar
 
Join Date: Jul 2011
Location: Naples, Florida & Cape Cod, Ma,
Posts: 546
Value working, had the same issue with old Brake, upgraded to new brake no change.
Rburian is offline   Reply With Quote
Old 03-26-2017, 11:57 AM   #5
Senior Member
 
Bigd9's Avatar


 
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 5,521
My last coach I bought was 6 years old and had 50,000 miles on her. I suspected the exhaust brake wasn't working. Transmission was downshifting, but I didn't think the brake was actually working. I took it to the first Cummins dealer and they promptly replaced the exhaust brake and proclaimed "all is working now". Still suspected it wasn't working and even got a video of it during the time it should have been moving, and no go. A second dealer replaced the exhaust brake and said "all is well now" we drove it and confirmed it was working. Another video confirmed it still wasn't working so I went to a third dealer and they worked on it and told me "we put a experienced mechanic back there and he had eyeballs on it and it is now working perfectly". Odd thing was there was only 0.1 tenth of a mile added to the odometer from when I dropped it off! Another video confirmed my suspicions that is still wasn't working, and in fact the 3 rd dealer had actually removed the compressed air line from the brake and capped it off!

I took it home and started to trouble shoot. What I found was someone forgot to plug the electrical connector leading to the exhaust brake in and the thing hadn't worked from the day the coach was made!!!!!!! And all of those "experts" at Cummins were fibbing.

All this to say, are you sure it is actually moving, and are you sure the valve plate is moving?

Is your Turbo failing to boost? There could be several problem areas some related to the exhaust brake and some not related.
__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
Bigd9 is offline   Reply With Quote
Old 03-26-2017, 12:33 PM   #6
Senior Member
 
Rburian's Avatar
 
Join Date: Jul 2011
Location: Naples, Florida & Cape Cod, Ma,
Posts: 546
I also had a video to confirm the brake is engaging, which it is, I,m thinking there must be a Exhaust leak before the brake since the brake is closing, but not fully slowing down the coach. When the brake is engaged it is downshifting and I believe most of the braking is the gear reduction not the exhaust. I understand that a leak in the CAC could cause both the Turbo and brake to not perform properly, but not sure about that.
Taking the coach in next week to a Diesel shop, but would like to hear from others with there thoughts.
Rburian is offline   Reply With Quote
Old 03-26-2017, 07:25 PM   #7
Senior Member
 
USMCRET's Avatar
 
Newmar Owners Club
Join Date: Jul 2011
Posts: 1,889
I assume you're talking about a PAC brake? IF so, I will tell you that most of the braking on my rig is thru the xmsn downshifting. From what I've read on here, that is normal.
__________________
2005 Newmar KSDP 3910
ISC on a Spartan
USMCRET is offline   Reply With Quote
Old 04-03-2017, 07:15 PM   #8
Senior Member
 
slickest1's Avatar
 
Monaco Owners Club
Join Date: Jul 2011
Location: B.C.
Posts: 4,361
Check your exhaust manifold for cracks. My exhaust brake did not work right when mine cracked.
__________________

__________________
Dennis & Marcie & Captain Hook The Jack Russell,aka PUP, 1998 HR Imperial 40 ft 2017 Equinox, 2010 Ram 1500 toads RVM59
A good day on the road means a restful night at the park!
slickest1 is offline   Reply With Quote
Reply

Tags
brake



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
C7: Phantom "Low Boost" and "No Boost" Codes ProjectPro Caterpillar Engine Forum 6 12-22-2016 01:20 PM
Low boost, cracked exhaust manifold , intercooler leak, turbo joslawrence Monaco Owner's Forum 12 08-18-2016 07:35 AM
Turbo Boost What is the Maximum Boost that a 5.9, 275HP shogun1940 Cummins Engines 10 11-30-2014 08:47 PM
Exhaust Brake, Compression Brake, vs Turbo Brake dengraham Cummins Engines 15 09-28-2014 04:17 PM
Exhaust Brake / Turbo Boost problem Greg from Pittsburgh Alpine Coach Owner's Forum 10 04-07-2010 09:54 PM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×