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05-05-2022, 05:21 PM
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#1
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Aug 2006
Location: On the open road
Posts: 719
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2014 450HP ISL-13 Low power on hills
I took my coach into Cummins service center for its annual service. I stayed in near by RV park for a couple days after service. When I left the RV park I headed south on I5 going from Coburg heading to Medford Oregon. Climbing the hills going south I was only able to keep my speed at 35 MPH. I normally can go 45 MPH or higher. I am going back to Cummins on Wednesday. My online research says it could be a fuel delivery issue. Does anyone have any ideas?
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2014 Winnebago Tour 42QD
2014 Honda CRV Toad W7REP
WiFiRanger Elite AC Pack
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05-06-2022, 07:08 AM
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#2
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Senior Member
Forest River Owners Club
Join Date: Aug 2002
Location: ...East Texas
Posts: 5,325
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It does sound like clogged fuel filter(s).
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Paul (KE5LXU) ...was fulltimin', now parttimin'
2022 Coachmen Leprechaun 319MB
towing 2017 Jeep Grand Cherokee Limited
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05-07-2022, 08:18 AM
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#3
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Senior Member
Join Date: Feb 2020
Location: NY State
Posts: 3,088
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On our '06 the yellow Check Engine light will be lit if the engine is fuel starved. It will go out by itself when there is enough fuel. For example, it will come on climbing steep grades if the filters are at end of life but go out on level ground. The ECM will also set a fault code, but you have to read between the lines of its description to know that it could be the filters. There is also a separate code for loss of power.
Do you have something you can used to read any codes that might be set?
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John
1976 Southwind 28', '96 Winnie 34WK,
2006 Tiffin Allegro Bus 40QDP
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05-12-2022, 06:46 PM
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#4
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,971
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Don't rule out the air intake system, how long since the air filter was replaced? What does the filter minder indicate? Your engine requires 14.5 gallons of turbo(compressed) air per gallon of fuel. The compression ratio/size of your turbo determines how many gallons of normal air is compressed into one.
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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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05-12-2022, 07:34 PM
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#5
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,751
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Quote:
Originally Posted by AFChap
It does sound like clogged fuel filter(s).
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Wouldn't Cummins change both fuel filters on an annual maintenance  .
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Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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05-12-2022, 07:36 PM
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#6
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jun 2014
Location: Somewhere On the Road
Posts: 1,217
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Interesting - right after engine service ...
Guess I'd look for an air leak in the fuel system from a loose filter - a mechanic's clamp left on the fuel filter line - water/fuel separator bowl full of water, etc.
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Steve
2015 Itasca Ellipse QD | 2014 Jeep Grand Cherokee
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05-13-2022, 07:22 PM
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#7
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,971
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BTW you do not have a Cummins ISL 13, you have an ISL 9 / I9. The ISL 9 has a displacement of 8.9L, thus the I9 designation.
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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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05-13-2022, 07:26 PM
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#8
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Senior Member
Join Date: Jul 2008
Location: Pennsylvania
Posts: 2,799
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Check for any codes.
Also, the throttle position sensor can go bad, and cause loss of power. It can even shut you down. Believe me, I have been thru it.
It shut me down in South Carolina. It’s a $45 part and it will require a tow if you can’t rectify it on the road.
__________________
2020 Winnebago Horizon 42Q (XCL chassis)
2022 Jeep Wrangler Sahara Unlimited
99 Storm 30H, 04 Southwind 32 VS, 07 Ellipse 40FD
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Linear Mode
