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Throttle shaft assembly

980 Views 8 Replies 2 Participants Last post by  bigfish95971, 
Mrich0908
Im having a hard time locating a kit or ....
My throttle shaft / bell crank has play in it enough to drop a half of volt sending my apps in low signal CEL.
If can rock the throttle up and down and physical see the voltage drop.
Is there a kit that replaces the bearing or. Any one else ever deal with this?
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B
Is the is at idle? What is it normally and when it drops, measured on what plug terminal?
The electrical should not change idle voltage becasue of a loose bushing in the Bellcrank assembly.
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B
Complete bellcrank and electrical apps are available for around $500 or maybe less.
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B
When the senor on back of the bell crank is properly adjusted to around .5v it should not be able to drop below that. It is not to be adjusted with the set screw on the throttle crank. That is just a throttle cable stop to eliminate slack in the cable.
You adjust the sensor by loosening the two screws slightly and rotating the sensor to get between .500 and .529v on pin #3. It is quite sensitive when adjusting. That is the same as your idle validation voltage. That tells several systems the truck is at idle. Then when it starts to move up in voltage with pedal input it accelerates the truck and tells the trani and other things it is doing so.
So adjust the sensor properly and then see what it does.


Don't believe what you read about it not being adjustable on the back. That is from Chrysler trying to get you to buy the whole assembly from them.


PS this as you describe has not been a problem for anyone else I know of.
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B
P Pump? I thought we were talking about a standard 01 VP truck. You have not said otherwise. But if it still has the same APPS bell crank and sensor on the block for a 98.5 to 02 what I said still applies. The sensor output ill not drop below idle of .5 volts if is properly adjusted on back with the loosened screws. That is the built in electronically stop point for voltage regardless of what the crank is doing. Idle and idle validation signals can't drop below that .5XX setting. Now above that when throttle is applied, slop at that point could very well jump around.
If it is the standard crank and apps it sounds like someone has installed a sensor at the bottom of its rotation and then tried to adjust the idle voltage with the stop screw on the bell crank. This is not the correct way to adjust the apps idle voltage. The screw is just to adjust cable slack before taking up acceleration.


So what exactly is your setup. Pump? APPS year, brand APPS.
Pictures? Is the culprit bearing a ball bearing or bushing?
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Ok. The bearing is not available as separate part unless you can buy it by size or number or make one if it is a bushing.
Here is one at $150
https://www.rockauto.com/en/catalog...uel+&+air,throttle+position+sensor+(tps),5136
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