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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 94-98 12V Forums > 94-98 Powertrain
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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Old 06-09-2012, 07:40 PM   #1 (permalink)
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more responsive after disconnecting TPS???

I have had this scenario occur a few times now, and I'm scratching my head as to why/how it's happening....

So I disconnect the TPS (throttle position sensor) and remove the 2 bolts holding it on, put it back on and reconnect the plug, fire the truck up and the throttle response is much better. Feels like I'm driving a different truck, has a lot more pep and doesn't feel so sluggish.

After I shut the truck off and start it again it's back to its sluggish self. Any ideas?
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Old 06-10-2012, 12:45 PM   #2 (permalink)
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Fill out your signature so we know what truck your workin on. I'm not sure what your actually unplugging?


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Old 06-10-2012, 10:36 PM   #3 (permalink)
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Quote:
Originally Posted by a2rags View Post
I have had this scenario occur a few times now, and I'm scratching my head as to why/how it's happening....

So I disconnect the TPS (throttle position sensor) and remove the 2 bolts holding it on, put it back on and reconnect the plug, fire the truck up and the throttle response is much better. Feels like I'm driving a different truck, has a lot more pep and doesn't feel so sluggish.

After I shut the truck off and start it again it's back to its sluggish self. Any ideas?
I would trash the TPS (unplug and forget about it) and hook up a POTS...
You are probably experiencing a phantom type surge when the TPS is disconnected / reconnected. After shut down the TPS resumes normal malfunction.
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Old 06-10-2012, 11:20 PM   #4 (permalink)
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Most car computers lose everything in memory when the battery is disconnected for a few minutes. It takes them awhile to relearn how to give the best mpg for a given drivers driving pattern. Maybe this is what is happening with the tps input?
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Old 06-10-2012, 11:49 PM   #5 (permalink)
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TP sensor is only used on auto trans trucks and/or trucks equipped with EGR. For auto trans trucks it only provides input for the torque convertor clutch and 4th gear shifting. EGR trucks its used to help regulate EGR flow along with ECT and IAT. I dont see how it could affect throttle response at all, unless maybe you have an EGR truck.
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Old 06-11-2012, 10:37 AM   #6 (permalink)
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Considering what the TPS controls on a 12 valve the only thing that makes sense is you are temporarily "fixing" a bad connection by unplugging the sensor or just moving the wires around.
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Old 06-13-2012, 12:57 AM   #7 (permalink)
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yea, I thought it might be plug/wiring related, but the wiring seems to be in great shape along with the plug, i've also tried messing with the plug after the truck goes back to being sluggish and it hasn't made a difference. only seems to get peppy if I actually remove the TPS altogether. I don't get it.
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Old 06-13-2012, 09:09 AM   #8 (permalink)
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Quote:
Originally Posted by a2rags View Post
yea, I thought it might be plug/wiring related, but the wiring seems to be in great shape along with the plug, i've also tried messing with the plug after the truck goes back to being sluggish and it hasn't made a difference. only seems to get peppy if I actually remove the TPS altogether. I don't get it.
Then you have an issue related to the transmission as that is the only thing the TPS controls. No other electronic controls on the engine.
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