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12-07-2011, 11:47 AM
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#1
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Senior Member
Monaco Owners Club
Join Date: Aug 2007
Location: Gardnerville, Nevada
Posts: 1,336
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High Idle Switch
When I start my coach and let it warm up a bit before driving off or when bringing in the slides I just let it idle. Should I be hitting the high idle switch and kicking up the RPMs? When should I use the high idle switch?
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Ken, Chris and Maverick (Golden Retriever)
2009 Beaver Contessa
1984 LS1 CJ7 & 2017 Yamaha YXZ SS SE 
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12-07-2011, 11:52 AM
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#2
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Senior Member
National RV Owners Club Solo Rvers Club Freightliner Owners Club
Join Date: Mar 2011
Location: FT for 6 years, NW in the summer, S in winter.
Posts: 1,173
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If you are plugged into external power, regular idle is ok. If not, then any time you are going to put a heavy load on the batteries, then fast idle will help some. Rook
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When you get a chance to dance, or sit this one out......I hope you DANCE!
98 National Tradewinds 7370, powered by a 3126B 300HP CAT Turbo, Freightliner XC chassis
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12-07-2011, 06:16 PM
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#3
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Aug 2006
Posts: 1,500
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Shouldn't be a prob. if you continue to leave. Do you shut down and restart before pulling out again?
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12-07-2011, 07:04 PM
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#4
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Senior Member
Join Date: Oct 2008
Location: Marshfield, WI
Posts: 719
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We don't have a high idle switch so I use cruise control to kick the idle up to 1000 rpm. My biggest concern is sustained low oil pressure and that's easily cured with a few rpms.
Almost as soon as the engine starts and the Protect Engine light goes off, I set the high idle until we're ready to leave.
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Denny, Connie & Shadow (former barn cat made good)
2006 Tiffin Phaeton, Cat C7, Freightliner Chassis
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12-07-2011, 07:16 PM
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#5
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Registered User
Join Date: Mar 2011
Posts: 1,943
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Anytime you sit a Cummins on idle it should be on high idle. unless it is in gear.
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12-07-2011, 07:46 PM
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#6
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Senior Member
Join Date: Oct 2006
Location: Rochester NY
Posts: 2,706
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Quote:
Originally Posted by kketterling
When I start my coach and let it warm up a bit before driving off or when bringing in the slides I just let it idle. Should I be hitting the high idle switch and kicking up the RPMs? When should I use the high idle switch?
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Most always. Diesels shouldn't idle at low rpm's as excess unburnt diesel fuel may wash down the cylinder walls and dilute/contaminate the oil.
High idle is always a good idea, unless you're just idling for a minute or so.
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Don
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX
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12-07-2011, 07:52 PM
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#7
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Senior Member
Monaco Owners Club
Join Date: Aug 2007
Location: Gardnerville, Nevada
Posts: 1,336
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When I get ready to leave a site I need to run the engine to air up air bags and put in travel mode when air pressure is up turn off the engine pull in slides then start engine and motor out. By the time I hit the highway engine up to temp.
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Ken, Chris and Maverick (Golden Retriever)
2009 Beaver Contessa
1984 LS1 CJ7 & 2017 Yamaha YXZ SS SE
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12-17-2011, 05:13 PM
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#8
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Nov 2001
Location: East Texas
Posts: 2,269
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Quote:
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Originally Posted by Perry White
Anytime you sit a Cummins on idle it should be on high idle. unless it is in gear.
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What RPM do you set your high idle at?
Craig
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2005 Fleetwood Providence 39J CAT C7 350, MP-8 Power Module
My wife does all the driving - I just hold the wheel...
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12-17-2011, 06:32 PM
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#9
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Registered User
Join Date: Mar 2011
Posts: 1,943
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High Idle on my ISM is 1000RPM.
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12-17-2011, 06:38 PM
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#10
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Senior Member
Country Coach Owners Club
Join Date: Jul 2009
Location: Sequim, WA
Posts: 1,421
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1,000 rpm
Quote:
Originally Posted by Craig P.
What RPM do you set your high idle at?
Craig
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Craig,
When I turn on the cruise control and then hit "Set" it goes to 1,000 RPM automatically. This is after starting the engine, the transmission in neutral, and the parking brake set. It may be different for different chassis makers, though I've heard others report the same behavior.
Mine's a Roadmaster with a Cummins ISL 370.
FWIW
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Dave & Cathy, 2002 Country Coach Affinity, 42', #6103, CAT C12, Sold - Retired From RV'ing, Linux Mint
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12-17-2011, 09:06 PM
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#11
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Nov 2001
Location: East Texas
Posts: 2,269
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Quote:
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Originally Posted by WindsorDave
When I turn on the cruise control and then hit "Set" it goes to 1,000 RPM automatically. This is after starting the engine, the transmission in neutral, and the parking brake set.
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Same thing happens with my Cat C7. I wasn't sure if it was necessary to increase it or not.
Thanks!
Craig
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2005 Fleetwood Providence 39J CAT C7 350, MP-8 Power Module
My wife does all the driving - I just hold the wheel...
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12-17-2011, 09:13 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 Rook
If you are plugged into external power, regular idle is ok. If not, then any time you are going to put a heavy load on the batteries, then fast idle will help some. Rook
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I see you have a CAT, but Cummins says to use high idle if you're going to idle for more than 5 min.
__________________
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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12-17-2011, 09:28 PM
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#13
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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 Martind4
We don't have a high idle switch so I use cruise control to kick the idle up to 1000 rpm. My biggest concern is sustained low oil pressure and that's easily cured with a few rpms.
Almost as soon as the engine starts and the Protect Engine light goes off, I set the high idle until we're ready to leave.
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That is the high idle switch on all the rigs I've seen, whether CAT or Cummins engines and Freightliner or Spartan chassis
__________________
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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01-30-2012, 03:24 PM
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#14
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Senior Member
Join Date: Jul 2006
Location: Bellingham,WA
Posts: 973
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Idle up on my C-7 350hp is controlled by the Freightliner cruise controls on the steering wheel rim.
The only harm you are going to do letting your engine idle is possibly ticking off some tree hugger that believes you are going to kill us all with your nasty air pollution. That "Don't idle your engine" nonsense came from them (-:
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