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03-02-2018, 04:57 PM
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#1
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Junior Member
Join Date: Oct 2016
Posts: 20
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Cummins ISL 360 loses power
i have a 08 knight, the engine bucks slightly on take off and climbing hills, also looses power can barley get over 35 mph,
runs fine on flat road. any suggestions?
Johnny1
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03-02-2018, 05:02 PM
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#2
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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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When were the fuel filter(s) last changed? Relatively cheap to try.
__________________
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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03-02-2018, 05:03 PM
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#3
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Senior Member
Monaco Owners Club
Join Date: Jan 2013
Location: Buckeye AZ
Posts: 326
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Quote:
Originally Posted by johnny1
i have a 08 knight, the engine bucks slightly on take off and climbing hills, also looses power can barley get over 35 mph,
runs fine on flat road. any suggestions?
Johnny1
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Hi Johnny. I think your Knight is an ISC. Check to see if there is black smoke from your exhaust. If so, check your charge air cooler and the 3-4" connections to see if they are clean and tight. You will access these through the bedroom floor.
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03-02-2018, 05:32 PM
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#4
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Senior Member
Join Date: Feb 2016
Posts: 143
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Quote:
Originally Posted by johnny1
i have a 08 knight, the engine bucks slightly on take off and climbing hills, also looses power can barley get over 35 mph,
runs fine on flat road. any suggestions?
Johnny1
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Is your boost PSI within its normal range?
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03-02-2018, 05:50 PM
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#5
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Senior Member
Join Date: Jul 2014
Posts: 35,444
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Fuel filters
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03-02-2018, 06:16 PM
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#6
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Senior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Jan 2012
Location: Virginia Beach,Virginia
Posts: 263
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Another vote for Fuel filters
__________________
2002 Holiday Rambler Imperial
38 PWD 370 ISL
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03-02-2018, 06:33 PM
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#7
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Senior Member
Join Date: Jul 2012
Posts: 887
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Another more vote for filters
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Mark
2002 40 PWD Monaco Windsor
Flat Towing Honda CR-V
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03-02-2018, 06:45 PM
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#8
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Junior Member
Join Date: Oct 2016
Posts: 20
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cummins isl 360 loses power
thanks guys for the reply filters are brand new, no black smoke, and yes it is a isc 360, don't know about the boost psi, i will have to check that, what should the psi be?, i read somewhere that the accelarator pedal might be bad, anyone have knowledge of this?
johnny1
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03-02-2018, 06:50 PM
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#9
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Moderator Emeritus
Monaco Owners Club Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 13,426
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Quote:
Originally Posted by johnny1
thanks guys for the reply filters are brand new, no black smoke, and yes it is a isc 360, don't know about the boost psi, i will have to check that, what should the psi be?, i read somewhere that the accelarator pedal might be bad, anyone have knowledge of this?
johnny1
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I get about 25 PSI boost on my ISC. I had a throttle position sensor (it's attached to you throttle pedal) go bad and the symptom is no acceleration with the pedal (only idles), but the cruise will control acceleration and deceleration. It would just randomly happen while driving down the road. The first time I just coasted to the side of the road, but I found out I could still control the throttle with cruise. In my case, I could turn off the engine and it would go back to normal for awhile. You need to pull codes to see if you have an issue that the ECM identified.
__________________
Dennis and Katherine
2000 Monaco Dynasty
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03-02-2018, 06:56 PM
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#10
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Senior Member
Join Date: Sep 2010
Posts: 427
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If the problem is associated with the accelerator pedal, it wouldn't be with the pedal itself, but would be the accelerator pedal position sensor. Possible, but unlikely. You say you have replaced the filters. Does that include the 104 micron in-line fuel filter you might have? Look on the inside of the passenger frame rail, just above the right rear air bag. The filter is about 2" in diameter and about 4" long and is attached to the frame. This fuel filter is often overlooked and can severely restrict fuel flow to the point of stalling the engine.
Dan
__________________
2006 Winnebago Journey 36GSE; 2014 CRV; Blue Ox; SMI AF-1
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03-02-2018, 07:01 PM
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#11
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Junior Member
Join Date: Oct 2016
Posts: 20
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i don't have any ECM codes, i will check the 104 micron filter, but i don't seem to have a fuel flow problem, runs ok on flat road, only when i first start off.
johnny1
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03-02-2018, 07:08 PM
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#12
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Senior Member
Join Date: Feb 2016
Posts: 143
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Quote:
Originally Posted by johnny1
thanks guys for the reply filters are brand new, no black smoke, and yes it is a isc 360, don't know about the boost psi, i will have to check that, what should the psi be?, i read somewhere that the accelarator pedal might be bad, anyone have knowledge of this?
johnny1
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Me 8.3C will get up around 30-40 PSI under full throttle. Your symptoms sound like a lack of boost. I had a boot blow off the other day that did the same thing. I've also had the linkage for the wastegate fall off and stick it wide open, and another time my boost line that tells the fuel pump when to add fuel had came unhooked. All of these issues caused the same symptoms.
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03-02-2018, 10:33 PM
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#13
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Senior Member
Join Date: Jun 2012
Location: NorCal
Posts: 3,000
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Are you sure your fuel gauge is correct, or could be picking up particles from fuel tank when going up hill??
__________________
Outbound
2002 Monaco Executive 500 ISM
2004 GMC 2500HD 4X4
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03-03-2018, 11:43 AM
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#14
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Moderator Emeritus
Monaco Owners Club Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 13,426
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Quote:
Originally Posted by Hartman2112
Me 8.3C will get up around 30-40 PSI under full throttle. Your symptoms sound like a lack of boost. I had a boot blow off the other day that did the same thing. I've also had the linkage for the wastegate fall off and stick it wide open, and another time my boost line that tells the fuel pump when to add fuel had came unhooked. All of these issues caused the same symptoms.
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What does your boost gauge look like? Mine maxes out at what is proably 35 PSI, the last number is 30 on mine.
__________________
Dennis and Katherine
2000 Monaco Dynasty
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