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12-26-2019, 05:44 PM
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#1
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Junior Member
Join Date: Mar 2015
Posts: 3
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ISX Cummins Failure
2006 ISX 15 liter Cummins
We had a number 6 intake valve failure at 32000 miles.
Has anyone with this failure removed the egr valve to prevent this from happening again?
Thanks in advance for your advice. This is my first posting here. I’ve enjoyed reading the forum for quite some time now.
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12-26-2019, 06:11 PM
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#2
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Senior Member
Join Date: Aug 2015
Location: Oregon
Posts: 642
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Mr. D has some insight on this. He's had troubles with his, but I believe it is fixed now.
Search the Cummins engine area, there are other posts talking about the ISX
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12-26-2019, 06:53 PM
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#3
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Senior Member
Newmar Owners Club Winnebago Owners Club Ford Super Duty Owner Freightliner Owners Club
Join Date: Feb 2014
Posts: 5,292
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__________________
BILL {aka-"Admiral"-"Deuce"-"W.D."}
2014 Itasca Ellipse 42QD, Freightliner Maxum, 450HP Cummins ISL, 3000 Allison, Roadmaster Nighthawk II, 2011 Lincoln MKX.
2012 Newmar Canyon Star (first coach) FMCA F428511.
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12-26-2019, 07:58 PM
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#4
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Junior Member
Join Date: Mar 2015
Posts: 3
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Thank you both for your replies. I’ll go look at the Cummins section.
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12-26-2019, 08:35 PM
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#5
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Senior Member
Join Date: Dec 2015
Location: Canton, mi
Posts: 131
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Quote:
Originally Posted by Joe e
2006 ISX 15 liter Cummins
We had a number 6 intake valve failure at 32000 miles.
Has anyone with this failure removed the egr valve to prevent this from happening again?
Thanks in advance for your advice. This is my first posting here. I’ve enjoyed reading the forum for quite some time now.
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How long have you owned it? Were you far from home when it happened?
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12-27-2019, 07:26 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: Sep 2013
Posts: 2,507
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The 2006 EGR engine is a different animal than the 2007 DPF engine in many ways. A lot of the 2007 & later information will not apply to your 2006 engine.
The information I have recommends putting a blocking plate on the EGR valve instead of removing it. It has to be a stainless plate of substantial construction to avoid failure. I think you can get one at Price's Diesel. They know a LOT about that subject. Home - pricesdieselrepair
__________________
2014 Newell 2020P 45'8" ISX 600 HP
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12-27-2019, 02:56 PM
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#7
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Registered User
Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,993
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You are only the second 2006 ISX #6 failure I've read about. What HP was it?
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12-30-2019, 03:16 PM
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#8
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Junior Member
Join Date: Mar 2015
Posts: 3
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Thanks for your replies.
I'm thinking that I probably have an '05 engine in an '06 coach. It is just an egr engine. It's rated at 525 hp.
My suspicion is that the exhaust gasses are corroding the valve stem and causing it to stick and I'm concerned that it could happen again.
I'm going to call Price's to get their feelings on what the benefit might be of blocking the egr.
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12-31-2019, 05:26 AM
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#9
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Registered User
Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,993
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OP, I would post your failure here: http://www.irv2.com/forums/f123/cumm...401436-32.html Not the HP I was hoping for...525 the same as mine. The more info you post the better. Sounds like you may have already had it fixed? If not you need to read about the “new and improved” parts.
I was able to get a camera to the #6 intake on my 06 525 ISX. It didn’t look any different than 4 or 5. I installed the “Ugly Fix” at 43K shortly after buying it in early 2018. At 48K I put a metal freeze plug in the EGR tube where it bolts to the intake manifold. The tube gets smaller as it turns into the intake so it cannot move from this location. I now have 56K and cannot tell any difference in engine operation, but I cannot monitor the exhaust gas temperature.
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01-05-2020, 05:33 PM
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#10
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Senior Member
Monaco Owners Club
Join Date: Sep 2013
Posts: 2,507
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Quote:
Originally Posted by Ivylog
I installed the “Ugly Fix” at 43K shortly after buying it in early 2018. At 48K I put a metal freeze plug in the EGR tube where it bolts to the intake manifold. The tube gets smaller as it turns into the intake so it cannot move from this location. I now have 56K and cannot tell any difference in engine operation, but I cannot monitor the exhaust gas temperature.
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I assume you did not put the plug in the EGR bellows because the EGR valve stays closed with the Ugly Fix? The reason I ask is I use Insite and can see the position of the EGR valve. When I installed the Ugly Fix, I could see it was still opening. I called the Ugly Fix folks. They had me test the module which tested fine. They told me that when the engine is started, the EGR valve cycles open and closed. If the EGR valve does not complete the cycle 100% each way the ugly fix does not do anything, the engine acts as if it was not in place. In my case I can see in normal operation the EGR valve cycles each way 100% open and closed, yet the Ugly Fix is not doing anything. If I did not have Insite there is no way I would know what is happening and I would be whistling down the highway happily and ignorant!
__________________
2014 Newell 2020P 45'8" ISX 600 HP
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01-05-2020, 07:12 PM
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#11
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,961
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An aside to this topic is; Cummins discontinued the ISX 650 HP, RV version, due to unreliability. paragraph 3 of https://www.capitalremanexchange.com...s-isx-history/
A man posting on the FMCA forums is attempting to compile a list of people with ISX failures, I suspect with a class-action suit in mind.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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01-05-2020, 07:24 PM
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#12
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by Ray,IN
An aside to this topic is; Cummins discontinued the ISX 650 HP, RV version, due to unreliability. paragraph 3 of https://www.capitalremanexchange.com...s-isx-history/
A man posting on the FMCA forums is attempting to compile a list of people with ISX failures, I suspect with a class-action suit in mind.
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Interesting article but I see several wrong items.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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01-06-2020, 07:46 AM
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#13
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Registered User
Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,993
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Quote:
Originally Posted by hypoxia
I assume you did not put the plug in the EGR bellows because the EGR valve stays closed with the Ugly Fix? The reason I ask is I use Insite and can see the position of the EGR valve. When I installed the Ugly Fix, I could see it wasby closing. I would be whistling down the highway happily and ignorant!
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In trying to get a camera to the #6 intake valve the EGR elbow in the intake tube, was making it harder to snake the camera in. The elbow also appeared to restrict the airflow into the engine so I cut it off after trying to just remove it...couldn’t just remove it. At that point it was easy to put the metal freeze plug in were the EGR tube bolts to the intake tube. I suspect the Ugly Fix is nothing but a $150 resistor.
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