Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
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 04-05-2010, 07:13 AM   #1
Member
 
Alpine Owners Club
Join Date: Dec 2008
Posts: 65
Exhaust Brake / Turbo Boost problem

While traveling back from Huntington Beach NC. for spring break (beautiful state park btw), I turned on my exhaust brake only to have my turbo shut down. At least that's what I think happened, the gauge on the dash went to 0 ant the exhaust temp gauge began to climb and I lost all power. I pulled off to the side of the road, turned the exhaust brake off, idled for a few minutes and the exhaust temp. came down and the boost gauge began to show some life and the engine ran fine. I've never felt or herd any difference when using the exhaust brake so I tend to leave it in the off position. I've checked the lever on the exhaust manifold and it moves freely, any idea how the two are related?
__________________

__________________
Greg Michel
2001 Alpine 36MDS
Greg from Pittsburgh 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 04-05-2010, 11:16 AM   #2
Senior Member
 
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,217
If you lost boost under all conditions I'd say you blew the charge air cooler open, or blew a line on its way between turbo & engine air intake. Getting boost back has me in a quandary. Do you think you have full boost returned or only partial?
__________________

__________________
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
EngineerMike is offline   Reply With Quote
Old 04-05-2010, 01:42 PM   #3
Moderator Emeritus
 
RustyJC's Avatar


 
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,854
You don't say whether this is an OEM (i.e., Jacobs) or aftermarket (i.e., Pacbrake) exhaust brake. The OEM-type brake gets its activation signal from the Cummins ECM while most aftermarket brakes get an activation signal from a throttle position switch - if you have the brake turned on, when you let off the throttle, the exhaust brake activates.

If it's the latter and the brake activates as soon as you turn it on, regardless of throttle position, I'd look for a problem in the throttle position switch or its wiring.

Rusty
__________________
RustyJC is offline   Reply With Quote
Old 04-05-2010, 08:55 PM   #4
Senior Member
 
Dave Fernandez's Avatar
 
Alpine Owners Club
Join Date: Jun 2003
Location: Ontario, CA USA
Posts: 1,294
Hello Greg:

If I understand correctly, when the exhaust brake (Pac Brake) came on you lost power when you attempted to accelerate back to normal speed. If I am correct the Pac Brake may be sticking closed but I think it may be a bad solenoid which applies air to the Pac Brake, and when you turn off the Pac Brake the solenoid release the air and power returns to normal. When the Pac Brake is engaged and you attempt to apply power the engine can not open the butterfly valve closing off the exhaust and the Turbo can not produce boost so the engine will not run properly.

I would first check the Solenoid to see if it is defective or is receiving power to engage when it should not.
__________________
Dave Fernandez
2001, 38ft FDDS, 350 ISC, Tow 2004 Yukon
http://www.alpinesocal.com
Dave Fernandez is offline   Reply With Quote
Old 04-06-2010, 09:18 AM   #5
Senior Member
 
Beagle RC Air's Avatar
 
Join Date: Nov 2001
Location: Raymond, Washington
Posts: 414
Quote:
Originally Posted by Dave Fernandez View Post
Hello Greg:

If I understand correctly, when the exhaust brake (Pac Brake) came on you lost power when you attempted to accelerate back to normal speed. If I am correct the Pac Brake may be sticking closed but I think it may be a bad solenoid which applies air to the Pac Brake, and when you turn off the Pac Brake the solenoid release the air and power returns to normal. When the Pac Brake is engaged and you attempt to apply power the engine can not open the butterfly valve closing off the exhaust and the Turbo can not produce boost so the engine will not run properly.

I would first check the Solenoid to see if it is defective or is receiving power to engage when it should not.
It has been my experience that the solenoid willl fail to operate on occasion and cause this problem as Dave has described above. The failure of the solenoid to function was traced back to a defect relay. This can be easily checked out by switching out the exhaust brake relay with a known good one. I used one next to the failed relay.
__________________
Beagle RC Air is offline   Reply With Quote
Old 04-06-2010, 01:56 PM   #6
Member
 
Dave & Colleen's Avatar
 
Join Date: Aug 2007
Location: Seattle, Washington
Posts: 64
Where is the solenoid located? Sounds like its a good spare item to carry, with that said. Do you still have the replacement part number for the solenoid?
__________________
Dave & Colleen is offline   Reply With Quote
Old 04-06-2010, 02:08 PM   #7
Moderator Emeritus
 
RustyJC's Avatar


 
Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,854
It sounds to me like the solenoid is working if the exhaust brake activates when you turn on the switch and deactivates when you turn off the switch. If I were troubleshooting it, I'd first look upstream in the accelerator pedal position actuation trigger circuit, whether it's coming from the ECM or a separate accelerator position switch.

If the contacts are welded in the relay mentioned above so that it's always engaged, it would cause the symptoms you seem to describe.

Rusty
__________________
RustyJC is offline   Reply With Quote
Old 04-07-2010, 05:47 AM   #8
Member
 
Alpine Owners Club
Join Date: Dec 2008
Posts: 65
Thank you for all the help, I will take a look at the solenoid as this seems to be the easiest and it would also help make sense of why I've never thought the exhaust brake was working. Where is this solenoid anyway?
__________________
Greg Michel
2001 Alpine 36MDS
Greg from Pittsburgh is offline   Reply With Quote
Old 04-07-2010, 10:52 AM   #9
Senior Member
 
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,217
Greg- you'll find four PacBrake docs on the Alpine Coach Tech Library page under Chassis. One is exploded parts, one is maintenance tips. These should help you locate the PB and deal w/the parts.
__________________
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
EngineerMike is offline   Reply With Quote
Old 04-07-2010, 05:27 PM   #10
Member
 
Alpine Owners Club
Join Date: Dec 2008
Posts: 65
Are we talking about a relay or a solenoid? The solenoid could most likely be found by tracing the air line coming off the Pac brake lever on the exhaust, but where in the world is the relay?
__________________
Greg Michel
2001 Alpine 36MDS
Greg from Pittsburgh is offline   Reply With Quote
Old 04-07-2010, 09:54 PM   #11
Senior Member
 
Beagle RC Air's Avatar
 
Join Date: Nov 2001
Location: Raymond, Washington
Posts: 414
The relay is in the electrical panel directly ahead of the passengers feet. It will be within one of the four 4X4 enclosed fuse covers. It is clearly marked, just carefully pull out the relay and switch with one of the other relays nearby. My problem was having the brake not to go off after use. When it stays on the exhaust smoke and lack of power will let you know it is hung up. I made sure it was free at the exhaust manifold and all the other things recommended. The problem was the relay which failed on occasion.
__________________

__________________
Beagle RC Air is offline   Reply With Quote
Reply



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
Turbo Exhaust Brake Maintenance Question shelland Alpine Coach Owner's Forum 8 03-11-2010 10:26 AM
ISM/K2 Turbo output exhaust pipe cracking RVDude Newmar Owner's Forum 34 10-30-2009 09:29 PM
Cummins ISB Exhaust Brake for 2003 Engine UFO Pilot Freightliner Motorhome Chassis Forum 8 07-15-2009 08:11 AM
Brake problem caused by Florida atmosphere Stockwill Workhorse and Chevrolet Chassis Motorhome Forum 13 09-17-2006 07:07 AM
Intermitant brake problem MaxAZ 5th Wheel Discussion 17 06-03-2005 06:05 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:54 AM.


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