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 01-30-2015, 10:52 AM   #1
Junior Member
 
Join Date: Jan 2015
Posts: 3
2007 Monaco Diplomat Cruise Control Vibration

I just recently purchased a 2007 Monaco Diplomat with the Cummins ISL 400HP motor. When I activate the Cruise Control it seems to vibrate the rearend so bad I have to turn it off. After more trial and error. This is what I have discovered.

When I start out, if I activate the cruise control at 50 mph and work my way up to 70MPH it works fine. When I stop for a break, and turn off the engine. Get back on the interstate and try to reset it at 70 MPH the vibration starts immediately.

NOTE: When it was working fine, I was hitting the side of my steering wheel to try and simulate rough rode conditions and it did not create this issue. Loose wires in the steering control unit is not the issue.

With the cruise control on, if the vibration starts I can give it more pedal and pass my pre set speed of 70 ( or any pre-set speed) it stops. The minute I lift my foot off the pedal and the speed drops below the pre-set speed and cruise engages by adding throttle and when it seems to get close to the pre-set speed to back off the throttle is when the vibrations starts back.

There is a few times I can set the speed and drive for 1/4 mile with no problems, what I noticed is my PCI ( percentage of Load ) numbers seem to bounce all over the place just before my Cruise starts to act up. This is looking at the Aladdin system information screen.

This is more prevalent on rough interstates. I have only taken 2 trips and talked to a couple of shops that have never heard of this before.

Auto Mechanic by trade (not diesel or Motorhome). It seems like to me, is the system is trying to control the speed to rapidly by engaging the throttle to quickly and releasing to quickly which is causing the vibration. I can come close to simulating this with my foot hitting the pedal rapidly manually with cruise off.


Anybody else heard of this or run across it. Would like to fix it before next trip.
__________________

__________________
ssalsman 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 01-30-2015, 12:22 PM   #2
Senior Member
 
2 Stroker's Avatar
 
Join Date: Nov 2009
Location: Warren, Oregon
Posts: 1,721
Quote:
Originally Posted by ssalsman View Post
I just recently purchased a 2007 Monaco Diplomat with the Cummins ISL 400HP motor. When I activate the Cruise Control it seems to vibrate the rearend so bad I have to turn it off. After more trial and error. This is what I have discovered.

When I start out, if I activate the cruise control at 50 mph and work my way up to 70MPH it works fine. When I stop for a break, and turn off the engine. Get back on the interstate and try to reset it at 70 MPH the vibration starts immediately.

NOTE: When it was working fine, I was hitting the side of my steering wheel to try and simulate rough rode conditions and it did not create this issue. Loose wires in the steering control unit is not the issue.

With the cruise control on, if the vibration starts I can give it more pedal and pass my pre set speed of 70 ( or any pre-set speed) it stops. The minute I lift my foot off the pedal and the speed drops below the pre-set speed and cruise engages by adding throttle and when it seems to get close to the pre-set speed to back off the throttle is when the vibrations starts back.

There is a few times I can set the speed and drive for 1/4 mile with no problems, what I noticed is my PCI ( percentage of Load ) numbers seem to bounce all over the place just before my Cruise starts to act up. This is looking at the Aladdin system information screen.

This is more prevalent on rough interstates. I have only taken 2 trips and talked to a couple of shops that have never heard of this before.

Auto Mechanic by trade (not diesel or Motorhome). It seems like to me, is the system is trying to control the speed to rapidly by engaging the throttle to quickly and releasing to quickly which is causing the vibration. I can come close to simulating this with my foot hitting the pedal rapidly manually with cruise off.


Anybody else heard of this or run across it. Would like to fix it before next trip.

From doing some reading your PCI ( percentage of Load ) on the Aladdin must be boost. I have the Silverleaf and mine shows boost and max on mine is around 32lbs.
Here is some stuff to read, may help.
RV.Net Open Roads Forum: Class A Motorhomes: Aladdin "pct load" info
more to read
Woodalls Open Roads Forum: Class A Motorhomes: Aladdin "pct load" info
2 stroker
__________________

__________________
2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mounting
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One
2 Stroker is offline   Reply With Quote
Old 01-30-2015, 12:26 PM   #3
YC1
Senior Member
 
YC1's Avatar


 
Holiday Rambler Owners Club
Join Date: Jun 2011
Posts: 5,575
As goofy as this sounds I would change both fuel filters. There are a lot of strange things that can happen with clogged filters.
__________________
Myron & Deborah
08 HR Endeavor 40 SKQ
2012 Ford Edge Limited FWD 3.5L
Aluminator tow bar, Demco base plate
YC1 is offline   Reply With Quote
Old 01-30-2015, 12:27 PM   #4
Senior Member
 
Pigman1's Avatar
 
Join Date: Sep 2011
Posts: 1,939
Before I got too far into the cruise control and perhaps turbo boost, I'd check the universals and drive line spline closely. I'd doubt this was the problem, but it'd be easier for me to check than getting into the engine/cruise computer. Just eliminating easy possibilities first.
__________________
Pigman
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad
Pigman1 is offline   Reply With Quote
Old 02-05-2015, 12:23 PM   #5
Junior Member
 
Join Date: Jan 2015
Posts: 3
Thanks for your response. Worked with Monaco Help line today, We pulled the transmission codes and found code U0115. Indicating a possible short or bad ground in the system. Just recently bought this RV and like an Idiot I did not look under this one and apparently this one came from somewhere in the northeast due to all the heavy Rust on the rails and a lot of clamps rusted out or replaced already. 7 years old and it looks like a rusted out truck on the underside. Not worried to much considering I will clean that up and I live in the southeast now. But working on cleaning up all the connectors and grounds to see if this fixes it.
__________________
ssalsman is offline   Reply With Quote
Reply

Tags
cruise control, monaco, vibration



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
2007 Monaco Diplomat Hydraulic Leveler Tank markmcc1776 Monaco Owner's Forum 3 12-02-2014 07:45 PM
2002 Diplomat cruise control not working? Krash Monaco Owner's Forum 9 11-22-2014 02:06 PM
2007 Monaco Diplomat 2 switches in cabinet above driver markmcc1776 Monaco Owner's Forum 9 11-11-2014 12:04 AM
2014 Cruise Control Garyp47 Ford Motorhome Chassis Forum 16 07-05-2014 09:30 AM
Cruise Control Failure '98 Tradewinds tradewinds98 National RV Owner's Forum 6 12-14-2013 04:47 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:14 AM.


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