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06-04-2016, 06:27 AM
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#1
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Member
Entegra Owners Club
Join Date: Apr 2014
Posts: 89
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Air noise when turbo is spooled up?
Hello all!
I have a 2012 Cummins 450 isl on a spartan mountain master chassis. Today I noticed that I cannot climb a grade and maintain speed on our trip yesterday. The turbo is showing boost on the dash but I can hear forced air when the turbo is boosting. I checked all the clamps around the inlet and outlet and they are all intact. It's still making power but not like it used to. Could the waste gate be stuck 'open'? I also looking for any linkages near the turbo and don't see anything. No check engine lights or any other measurements out of normal (temp, oil pressure, etc.). Anyone seen something like this? I'm going to call next week to try and get it into the shop but I still need to get back home in the condition it's in. Thank you in advanced for any assistance!
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Jeff & Jenn Breault
2012 Entegra Anthem 44SL, 2020 Jeep Gladiator Rubicon Launch Edition
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06-04-2016, 07:00 AM
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#2
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Senior Member
Newmar Owners Club
Join Date: Sep 2005
Location: Orange Park, FL
Posts: 813
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We had thi s\happen to our Cummins 450 ISM and it was a cracked turbo pipe. It sont hurt to drive the coach like this, but as you say, power will be limited - especially going uphill.
Mark
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Mark & Sheila Heilman & The 3 Fur-Ball Princesses - Nikko, Mai-Thai & Andy
'07 MADP 4523, 2012 GMC Terrain SLT 2 wd
Blue Ox Alladin Tow Bar, M&G Engineering Dinghy Braking System
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06-04-2016, 03:48 PM
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#3
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Senior Member
Join Date: Sep 2006
Location: Fulltime/ SE Minnesota
Posts: 3,120
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Like Mark, I had a badly cracked turbo pipe also and just drove it that way until I could get it to a shop.
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08 Foretravel Nimbus 40 ft tag axle / 1000 watts of solar
2019 Ram 1500 Big Horn Hemi 4x4
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06-04-2016, 03:57 PM
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#4
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Registered User
Join Date: Feb 2012
Location: Troy Mo
Posts: 1,951
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What boost pressure are you showing on a hard pull?
I agree though probably a cracked pipe or charge air cooler, possibly a blown connector going into the CAC. Noel
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06-04-2016, 11:57 PM
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#5
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Jun 2013
Location: Apple Valley CA
Posts: 1,069
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There is no waste gate. It's a variable vein turbo VVT.
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[SIGPIC][/SIGPIC]
Craig & Carolyn Roberts Apple Valley, CA
Toad: 2017 GMC Canyon 4X4 Crewcab
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06-06-2016, 09:19 AM
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#6
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Member
Entegra Owners Club
Join Date: Apr 2014
Posts: 89
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Quote:
Originally Posted by loisjop
What boost pressure are you showing on a hard pull?
I agree though probably a cracked pipe or charge air cooler, possibly a blown connector going into the CAC. Noel
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Its showing 30.9 - 33.6 on the info panel. The loud hissing sound became a high pitched squeal during the ride home. The squeal seems to be gone, and the hissing isn't as loud as it was. Its home now, with an appointment for the shop next week. Hope its something simple and cost effective to repair...
Thank you all for the information. I will post another update once I have the diagnosis.
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Jeff & Jenn Breault
2012 Entegra Anthem 44SL, 2020 Jeep Gladiator Rubicon Launch Edition
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06-06-2016, 09:30 AM
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#7
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Senior Member
Join Date: Aug 2013
Location: Cincinnati, OH
Posts: 849
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Sounds like charge air cooler (aka intercooler) leaking. The turbo is building boost, but the cooler is letting pressurized air escape.
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2017 Renegade Verona 36 VSB
2005 Kenworth Showhauler truck conversion. sold .
I used to have a handle on life, but it broke 
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06-07-2016, 08:19 AM
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#8
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Senior Member
Join Date: Sep 2006
Location: Fulltime/ SE Minnesota
Posts: 3,120
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A blown exhaust manifold gasket can sound pretty weird from the drivers seat also.
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08 Foretravel Nimbus 40 ft tag axle / 1000 watts of solar
2019 Ram 1500 Big Horn Hemi 4x4
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06-16-2016, 01:06 PM
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#9
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Member
Entegra Owners Club
Join Date: Apr 2014
Posts: 89
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It turns out one of the boots was leaking. They replaced it along with adding a second clamp. Seems to have solved the problem. Thank you all for the input!!
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Jeff & Jenn Breault
2012 Entegra Anthem 44SL, 2020 Jeep Gladiator Rubicon Launch Edition
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