more responsive after disconnecting TPS??? - Dodge Cummins Diesel Forum

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post #1 of 8 (permalink) Old 06-09-2012, 07:40 PM Thread Starter
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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?


'97 12v 4x4
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post #2 of 8 (permalink) Old 06-10-2012, 12:45 PM
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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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post #3 of 8 (permalink) Old 06-10-2012, 10:36 PM
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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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post #4 of 8 (permalink) Old 06-10-2012, 11:20 PM
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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?

1997 3500 club cab 3.54 gears towing & camper pkg. Still stock with a built transmission at 120k. 4" exhaust, 4kgsk, and exhaust brake waiting for installation. 37337 upgrade. Still need ideas for improvements for hauling 15k fifth wheel.
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post #5 of 8 (permalink) Old 06-10-2012, 11:49 PM
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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.

98 12v, 48RE, Revmax kit, V/B, triple disc stage 5, ultra low stall with a few other billet pieces. AFC modded, 100ish plate, 16.5ish*, KDP gone, 60lb springs, 4K-GSK, BHAF, pyro, trans, boost guage. , 72 AM general M35A2 LDT465
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post #6 of 8 (permalink) Old 06-11-2012, 10:37 AM
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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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'95 2500 4wd auto
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post #7 of 8 (permalink) Old 06-13-2012, 12:57 AM Thread Starter
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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.

'97 12v 4x4
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post #8 of 8 (permalink) Old 06-13-2012, 09:09 AM
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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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