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Old 07-31-2021, 08:53 PM   #1
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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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Old 07-31-2021, 10:30 PM   #2
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Seems like fuel filters or leaking CAC hoses

Have you replaced the filters ?
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Old 07-31-2021, 10:44 PM   #3
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Quote:
Originally Posted by MontaguePEI View Post
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.
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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Old 07-31-2021, 10:48 PM   #4
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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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Old 08-01-2021, 04:56 PM   #5
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Sounds like the tranny is in Econ mode
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Old 08-01-2021, 06:42 PM   #6
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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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Old 08-01-2021, 06:57 PM   #7
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Scan Gauge D shows TPS on my Cummins not sure about Cat!
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Old 08-02-2021, 05:53 AM   #8
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Yup
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Old 08-02-2021, 05:59 AM   #9
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Quote:
Originally Posted by Ray,IN View Post
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.
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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