Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Workhorse and Chevrolet Chassis Motorhome Forum
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 02-19-2008, 06:10 PM   #29
Senior Member
 
dnebout's Avatar
 
Join Date: Jan 2007
Posts: 140
Dropped my motorhome at R Mechanic in Livermore, Ca this morning. They're going to take a look at it.
__________________
2004 Allegro 32BA
dnebout 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 02-23-2008, 05:52 AM   #30
Senior Member
 
dnebout's Avatar
 
Join Date: Jan 2007
Posts: 140
Ok, here's the latest. R Mecahnic and Workhorse are saying that the Catalytic comverters are too far back from the engine therefore not hot enough and not burning off the Hydrocarbons. I was told that Tiffin may have moved the Catalytic converters back 36" or so when they built the coach.
This makes sense because the engine passes at high RPMs while the Cat is hot, but then at low RPMs the Cats are so far back that they cool down and are no longer useful.
I called Tiffin and they will look into any modifications that may have been made at the factory on Monday.
__________________
2004 Allegro 32BA
dnebout is offline   Reply With Quote
Old 02-23-2008, 06:30 AM   #31
Senior Member
 
Steady Eddie's Avatar
 
Join Date: Apr 2006
Location: The Great Pacific Northwet
Posts: 382


I'd bet that WCC and R Mechanic's Tech are right on. After crawling under your Coach, can you see where an extra section of exhaust pipe tubing has been "scabbed" in there to move the cats back?? This probably means that every Coach built by Tiffen, on the same WB WCC has the same smog issues...who'd have thunk it??
__________________
Steady Eddie/1999 KSCA 3357/P12 Chassis/454 Vortec L-21

Allison transmisson
Steady Eddie is offline   Reply With Quote
Old 02-23-2008, 09:16 AM   #32
Senior Member
 
dnebout's Avatar
 
Join Date: Jan 2007
Posts: 140
The guy at R Mechanic did see a piece of pipe put in between the Cat and the exhaust manifold that didn't look like it came from the Workhorse factory. I don't have the coach here at my house to see it myself.

The whole thing makes complete sense, doesn't it?
__________________
2004 Allegro 32BA
dnebout is offline   Reply With Quote
Old 02-23-2008, 01:29 PM   #33
Senior Member
 
Fred and Bonnie's Avatar
 
Workhorse Chassis Owner
Join Date: Jan 2002
Location: Pacific Northwest or SoCal
Posts: 3,035
Send a message via ICQ to Fred and Bonnie
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by dnebout:
The guy at R Mechanic did see a piece of pipe put in between the Cat and the exhaust manifold that didn't look like it came from the Workhorse factory. I don't have the coach here at my house to see it myself.

The whole thing makes complete sense, doesn't it? </div></BLOCKQUOTE>

I don't want to start a big legal issue here, but it is illegal to alter the exhaust system in Calif.

Fred
__________________
Fred and Bonnie
2005 Dolphin LX 6375
Abby, Ruffles & Scarlett, "The Cats"
Fred and Bonnie is offline   Reply With Quote
Old 02-24-2008, 04:20 AM   #34
Senior Member
 
Horsepowerfan's Avatar
 
Workhorse Chassis Owner
Join Date: Sep 2003
Location: Webster, FL, USA
Posts: 240
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by dnebout:
The guy at R Mechanic did see a piece of pipe put in between the Cat and the exhaust manifold that didn't look like it came from the Workhorse factory. I don't have the coach here at my house to see it myself.

The whole thing makes complete sense, doesn't it? </div></BLOCKQUOTE>

Yes, it does. The catalytic converters have to be HOT to do their job properly which is to reduce hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) pollutants from the exhaust gas.

If they are too far back, they'll cool down at idle which could definitely cause your problem.

To answer one of your earlier questions, the difference in an ECM and a PCM is more than just nomenclature.

The Engine Control Module does just that. In a nutshell, it receives inputs from the engine sensors and controls the engine operation.

A PCM is a Powertrain Control Module and not only controls the engine, but the rest of the powertrain (namely the transmission) as well.

An ECM is usually accompanied by a TCM (Transmission Control Module), like on our motorhomes with the Allison trans., whereas a PCM is an all-in-one unit which is more commonly found in an automobile or light truck.
__________________
Jim & Linda
'03 Winnebago Adventurer 35U (W22)
'06 Saturn Vue Toad
Horsepowerfan is offline   Reply With Quote
Old 02-24-2008, 07:10 AM   #35
Senior Member
 
dnebout's Avatar
 
Join Date: Jan 2007
Posts: 140
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Fred and Bonnie:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by dnebout:
The guy at R Mechanic did see a piece of pipe put in between the Cat and the exhaust manifold that didn't look like it came from the Workhorse factory. I don't have the coach here at my house to see it myself.

The whole thing makes complete sense, doesn't it? </div></BLOCKQUOTE>

I don't want to start a big legal issue here, but it is illegal to alter the exhaust system in Calif.

Fred </div></BLOCKQUOTE>


The coach is from Iowa
__________________
2004 Allegro 32BA
dnebout is offline   Reply With Quote
Old 02-24-2008, 07:12 AM   #36
Senior Member
 
dnebout's Avatar
 
Join Date: Jan 2007
Posts: 140
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Horsepowerfan:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by dnebout:
The guy at R Mechanic did see a piece of pipe put in between the Cat and the exhaust manifold that didn't look like it came from the Workhorse factory. I don't have the coach here at my house to see it myself.

The whole thing makes complete sense, doesn't it? </div></BLOCKQUOTE>

Yes, it does. The catalytic converters have to be HOT to do their job properly which is to reduce hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) pollutants from the exhaust gas.

If they are too far back, they'll cool down at idle which could definitely cause your problem.

To answer one of your earlier questions, the difference in an ECM and a PCM is more than just nomenclature.

The Engine Control Module does just that. In a nutshell, it receives inputs from the engine sensors and controls the engine operation.

A PCM is a Powertrain Control Module and not only controls the engine, but the rest of the powertrain (namely the transmission) as well.

An ECM is usually accompanied by a TCM (Transmission Control Module), like on our motorhomes with the Allison trans., whereas a PCM is an all-in-one unit which is more commonly found in an automobile or light truck. </div></BLOCKQUOTE>

Hats off to the mechanic on this one. That's some tough troubleshooting.
Thanks for the explanation on the different meanings of computers. That was one of my original questions in this post.
__________________
2004 Allegro 32BA
dnebout is offline   Reply With Quote
Old 02-24-2008, 08:21 AM   #37
Senior Member
Official iRV2 Sponsor
 
Join Date: Jul 2005
Location: CENTRALIA, WA
Posts: 1,526
Can somebody measure thier manifold to Converter difference and let us know,so DNEbout can do the same??
__________________
Jon Brazel
Ultra RV Products / Brazel's RV Performance
Ultra RV Products is offline   Reply With Quote
Old 02-24-2008, 08:47 AM   #38
Senior Member
 
dnebout's Avatar
 
Join Date: Jan 2007
Posts: 140
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Brazels RV Performance:
Can somebody measure thier manifold to Converter difference and let us know,so DNEbout can do the same?? </div></BLOCKQUOTE>

Great idea Mike! I will call R Mechanic tomorrow and get a measurement from them before they move the cat closer to the motor.
__________________
2004 Allegro 32BA
dnebout is offline   Reply With Quote
Old 02-24-2008, 08:59 AM   #39
Senior Member
 
Oemtech's Avatar
 
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 4,501
Send a message via AIM to Oemtech
A photo would even be better.
__________________
Dale
AKA - Oemy
Oemtech is offline   Reply With Quote
Old 02-24-2008, 09:02 AM   #40
Senior Member
 
Jayco Owners Club
Join Date: Jul 2004
Posts: 2,198
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Brazels RV Performance:
Can somebody measure thier manifold to Converter difference and let us know,so DNEbout can do the same?? </div></BLOCKQUOTE>

Mine is about 9 feet back from the exhaust manifold.

If he needs just a little more heat, would an insulating cuff on the existing pipe work?
__________________
DonavonP
2016 Jayco White Hawk 27dsrl
US Army 1968-70 SETAF 559th Vicenza Italy
DonavonP is offline   Reply With Quote
Old 02-24-2008, 09:57 AM   #41
Senior Member
 
dnebout's Avatar
 
Join Date: Jan 2007
Posts: 140
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by DonavonP:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Brazels RV Performance:
Can somebody measure thier manifold to Converter difference and let us know,so DNEbout can do the same?? </div></BLOCKQUOTE>

Mine is about 9 feet back from the exhaust manifold.

9 feet from the header flange to the beginning of the cat?

If he needs just a little more heat, would an insulating cuff on the existing pipe work? </div></BLOCKQUOTE>
__________________
2004 Allegro 32BA
dnebout is offline   Reply With Quote
Old 02-24-2008, 10:27 AM   #42
Senior Member
 
Jayco Owners Club
Join Date: Jul 2004
Posts: 2,198
I crawled under the MH with a tape measure this time. It's 55 inches from the exhaust manifold flange to the first connector and 40 inches from the connector to the beginning of the cat. So that's 95 inches.

Update: I took some pictures and emailed them to Dale Olson "OMEY". Hope thats ok with Omey
__________________
DonavonP
2016 Jayco White Hawk 27dsrl
US Army 1968-70 SETAF 559th Vicenza Italy
DonavonP 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
smog info root National RV Owner's Forum 4 03-28-2008 05:11 PM
ABS by pass ron55 Workhorse and Chevrolet Chassis Motorhome Forum 12 03-24-2008 10:26 AM
If you pass me ... skigramp Winnebago Industries Owner's Forum 6 12-30-2007 07:10 AM
Calif to Smog Diesels Tcloud7 Winnebago Industries Owner's Forum 3 03-18-2007 11:26 AM
EZ Pass in MA, NH, ME, NY, CT & NJ Ken Hatch Northeast Region 23 06-07-2005 07:41 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 03:50 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.