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07-31-2021, 08:53 PM
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#1
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Junior Member
Winnebago Owners Club
Join Date: Jan 2017
Posts: 12
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Full throttle testing
Have 40' 1999 Winnebago Ultimate Freedom with CAT 330H/P engine and Freightliner chassis and looking for info on the throttle pedal.
Is there a DIY way to test if throttle is working properly. It feels like I am driving at just over 1/2 to 3/4 throttle. If I get to a hill and floor it the engine rpm barely changes and trans does not down shift until I loose 10-15 mph. Yes loss of power can be other things but throttle is best place to start looking. Then keep loosing speed. If I down shift manually, engine rpm rarely gets to 2500 rpm.
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07-31-2021, 10:30 PM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 35,441
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Seems like fuel filters or leaking CAC hoses
Have you replaced the filters ?
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07-31-2021, 10:44 PM
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#3
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Senior Member
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 9,941
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Quote:
Originally Posted by MontaguePEI
Have 40' 1999 Winnebago Ultimate Freedom with CAT 330H/P engine and Freightliner chassis and looking for info on the throttle pedal.
Is there a DIY way to test if throttle is working properly. It feels like I am driving at just over 1/2 to 3/4 throttle. If I get to a hill and floor it the engine rpm barely changes and trans does not down shift until I loose 10-15 mph. Yes loss of power can be other things but throttle is best place to start looking. Then keep loosing speed. If I down shift manually, engine rpm rarely gets to 2500 rpm.
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Well,
As Skip states, if you haven't already, I'd look into any replacement of one or both of your fuel filters, if you have two. Some did, some don't. Second, maybe your air filter has some clogging. Do you you have a filter minder on it? What does it show? And depending on specific operating conditions, 2,500's a bit high for basic diesel engine rpm ops. For that 330HP 3126 you have, at 2,500 you're way out of your torque range and a bit out of your HP range. Do you have a boost gauge? If so, what does it state for max boost?
Scott
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07-31-2021, 10:48 PM
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#4
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Senior Member
Join Date: Jan 2005
Posts: 1,447
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No way unless you have the software to see the electronic position. But generally if you push the pedal to the floor and you are at high idle rpm in neutral
, you are getting full throttle. Many things can cause sluggish acceleration/low power. Check easy stuff first- fuel and air filters- exhaust brake stuck partially on turbo air line. Safe Travels
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08-01-2021, 04:56 PM
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#5
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Senior Member
Join Date: Sep 2016
Location: Sarasota, FL
Posts: 5,228
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Sounds like the tranny is in Econ mode
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1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
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'08 Jeep GC Overland.
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08-01-2021, 06:42 PM
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#6
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,971
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Keep in mind the CAT engine does not have the RPM range of a gas engine, 2,500 is about max under power.
When was the last time you replaced the air filter, and fuel filters.
If you have an electronic throttle, yes it may be tested using your VOM meter set to ohms. You aren't looking for exact readings, you're looking for smooth continual readings from closed to WOT, then back to closed. These tests must be repeatable.
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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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08-01-2021, 06:57 PM
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#7
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Senior Member
National RV Owners Club Freightliner Owners Club
Join Date: Sep 2017
Location: Rice Lake, Wisconsin
Posts: 790
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Scan Gauge D shows TPS on my Cummins not sure about Cat!
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2003 National Tradewinds LTC 7374 FL XC-Chassis IFS, Steer Safe, 8.3 ISC 350 Cummins, 3000MH Allison, 2023 Equinox, Blue Ox Tow-Bar, Brake Master Air Over Hyd
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08-02-2021, 05:53 AM
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#8
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Junior Member
Winnebago Owners Club
Join Date: Jan 2017
Posts: 12
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Yup
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08-02-2021, 05:59 AM
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#9
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Junior Member
Winnebago Owners Club
Join Date: Jan 2017
Posts: 12
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Quote:
Originally Posted by Ray,IN
Keep in mind the CAT engine does not have the RPM range of a gas engine, 2,500 is about max under power.
When was the last time you replaced the air filter, and fuel filters.
If you have an electronic throttle, yes it may be tested using your VOM meter set to ohms. You aren't looking for exact readings, you're looking for smooth continual readings from closed to WOT, then back to closed. These tests must be repeatable.
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This sounds great to test with VM. Have done all the other suggestions from members etc. Will test and after that it’s going to the CAT doctor
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