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Old 03-04-2021, 02:54 PM   #1
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No throttle until coach is moving??

Starts and idles great. Put it in gear.. No throttle response till it is moving over 5 miles an hour.. Takes off after 5mph.. What could possible cause this??
98 Fleetwood
Frieghtliner XL
Cummins ISB275
Allison 6 speed auto
Any help would be much appreciated
Thx
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Old 03-05-2021, 08:33 AM   #2
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My suggestion is call the 24/7 help line at 800-385-4357. They should be able to help you. Have your VIN number handy.

Don
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Old 03-05-2021, 10:04 AM   #3
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I replaced a MAP sensor on the intake manifold (near transmission side of engine) for sluggish response from startup. IIRC I purchased on the road from an O'Reilly and had to also get a large socket for it.

How are your boost levels? If there is a boost leak somewhere, it can cause sluggish turbo response also.

Best of luck.
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Old 03-05-2021, 10:41 AM   #4
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Hmmmmm,
This is an odd one. I'm wondering, how does one get about 15 tons of coach moving, if it's slightly uphill on a take off, if you have no throttle 'till after 5+ mph? Not all driving or take-offs are level or downhill. Other than those questions I'm sorry I don't have a suggestion to try. Kind-a interested in the actual answer though, just in case it happens to me on our '04 Itasca Horizon 36GD with the CAT C-7 330HP.
Scott
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Old 03-05-2021, 01:00 PM   #5
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Thx
Quote:
Originally Posted by mevman View Post
I replaced a MAP sensor on the intake manifold (near transmission side of engine) for sluggish response from startup. IIRC I purchased on the road from an O'Reilly and had to also get a large socket for it.

How are your boost levels? If there is a boost leak somewhere, it can cause sluggish turbo response also.

Best of luck.
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Old 03-05-2021, 01:08 PM   #6
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It barely moves idling, even on a slight up hill. Throttle gives 50 to 150 rpms. Changes from time to time... It feels like I just barely crack the throttle... Till it reaches 1500 rpms. Then it takes off..
Like normal... Under 1500 it just creeps..
Takes over a minute or two to get to the slight hill. Then over 1500 it runs great... Shifts great.. Pulls hard...

Quote:
Originally Posted by FIRE UP View Post
Hmmmmm,
This is an odd one. I'm wondering, how does one get about 15 tons of coach moving, if it's slightly uphill on a take off, if you have no throttle 'till after 5+ mph? Not all driving or take-offs are level or downhill. Other than those questions I'm sorry I don't have a suggestion to try. Kind-a interested in the actual answer though, just in case it happens to me on our '04 Itasca Horizon 36GD with the CAT C-7 330HP.
Scott
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Old 03-05-2021, 01:58 PM   #7
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I have experienced the same thing 3 different times. When this has happened I replaced both fuel filters and always ran fine afterword. The fuel filters were never old prior to sluggish acceleration problem.
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Old 03-05-2021, 02:39 PM   #8
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Quote:
Originally Posted by 98fleetwood View Post
Starts and idles great. Put it in gear.. No throttle response till it is moving over 5 miles an hour.. Takes off after 5mph.. What could possible cause this??
98 Fleetwood
Frieghtliner XL
Cummins ISB275
Allison 6 speed auto
Any help would be much appreciated
Thx
I also have the ISB RV275 motor in my Ford F800. There's a parameter in the programming that limits the engine RPM until it sees enough mph. When you weigh 30,000lb and are trying to get moving on grade you're effectively stuck. Had a shop change the parameter from 1500 RPM to 3000, problem solved.
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Old 03-05-2021, 03:59 PM   #9
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Interesting
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Originally Posted by rollinbrian View Post
I also have the ISB RV275 motor in my Ford F800. There's a parameter in the programming that limits the engine RPM until it sees enough mph. When you weigh 30,000lb and are trying to get moving on grade you're effectively stuck. Had a shop change the parameter from 1500 RPM to 3000, problem solved.
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Old 03-06-2021, 07:39 AM   #10
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Please keep us up dated?
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Old 03-06-2021, 09:58 AM   #11
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Quote:
Originally Posted by rollinbrian View Post
I also have the ISB RV275 motor in my Ford F800. There's a parameter in the programming that limits the engine RPM until it sees enough mph. When you weigh 30,000lb and are trying to get moving on grade you're effectively stuck. Had a shop change the parameter from 1500 RPM to 3000, problem solved.
It's called *Torque rise*. The diesels put out so much torque in such low rpms that, if not limited, some of them can tear up a drive train somewhat easily. We had the same things in all our FD trucks. The OP's rig may have slipped out of adjustment or, has developed other issues related to the throttle.

Scott
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Old 03-06-2021, 10:35 AM   #12
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If you ever watched truck or tractor pulls, you would see what happen when you add full fuel to a low RPM diesel engine. Black smoke !

Before pollution regulations or controls, diesels had stacks to blow the smoke up away from the cars.

Our old, 1985, Mack trucks had " Puff limiters ". They restricted the fuel flow until the manifold pressure ( boost ) was high enough to burn cleaner. When they failed, the engine smoked black on take off or was lame, lacking power.

All of that fuel control is done electronically now.

Your slow takeoff may be a sensor out of range.
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Old 03-07-2021, 06:31 AM   #13
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I am having the VP44 rebuilt...
Just hope I am not pissing in the wind..
More to come.....
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Please keep us up dated?
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Old 03-10-2021, 06:17 PM   #14
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It was the VP44.
Thanx for anyone's input!!
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