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1 Posts
I keep hearing of this mod. What does it do and what am I to gain by doing it?
Thanks,
Brian
2002 Durango 4.7L
Thanks,
Brian
2002 Durango 4.7L
TPS Mod
1 - 19 of 19 Posts
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6,587 Posts
id chime in, but you have a 4.7, so i cant really say for those engines...cant be no different that it is for the older magnums though.
take the tps sensor off, and get a drill bit slightly bigger than the brass insert where the screw goes though. you will be drilling these brass inserts out. then when placing it back into the tb, you are going to need a pair of washers to hold the tps against the tb. get a volt meeter, and place it into the harness for the tb, where the middle wire goes into it. and then turn the key to the on position (not start), and see what the reading is. slightly turn it so the voltage goes up. on the older magnums, i know anything higher than a .80 will trip a code. unsure what it is for the newer motors. but try to get it higher than stock, and to not have it trip a code.
what this does is actually tells the computer the tb is being opened and as to what rate. turn the voltage up, and it tells the computer the throttle is being opened just a little bit sooner. this voltage has a range, and i not sure what it is on the wide open side though, so i think there is a bit of room for this mod to be done. i have it done on mine, and i dont get a code at all.
hope this helped.
btw, welcome to the site
take the tps sensor off, and get a drill bit slightly bigger than the brass insert where the screw goes though. you will be drilling these brass inserts out. then when placing it back into the tb, you are going to need a pair of washers to hold the tps against the tb. get a volt meeter, and place it into the harness for the tb, where the middle wire goes into it. and then turn the key to the on position (not start), and see what the reading is. slightly turn it so the voltage goes up. on the older magnums, i know anything higher than a .80 will trip a code. unsure what it is for the newer motors. but try to get it higher than stock, and to not have it trip a code.
what this does is actually tells the computer the tb is being opened and as to what rate. turn the voltage up, and it tells the computer the throttle is being opened just a little bit sooner. this voltage has a range, and i not sure what it is on the wide open side though, so i think there is a bit of room for this mod to be done. i have it done on mine, and i dont get a code at all.
hope this helped.
btw, welcome to the site
Joined
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238 Posts
I saved this from somewhere.... so here you go 
TPS Modification:
(Applies to '92 -Current models)
Have you ever noticed that slight stumble right off idle when you mash the pedal to the floor? Here's an easy fix for the sluggish response of the throttle (which is related to the TPS Sensor).
Here's a chart that shows the change in the Absolute TPS% that the PCM sees
TPS Voltage Absolute TPS%
------------ --------------
.44v ............. 7.9%
.53v .............10.1%
.685v.............12.5%
.75v .............13.7%
.82v .............15.3%
Check your TPS voltage before doing this modification as none of the factory sensors are calibrated the same. We've seen ranges from .3v-.7v...from the factory. Connect a Digital Volt Meter to the middle terminal on the TPS sensor (with the harness connected and the Key-ON/Engine-OFF). If it's close to .7v...leave it alone.
(1) Remove your TPS Sensor from the vehicle (Located on the drivers side of the throttle body - 3-Wire Connector)
(2) Put the TPS into a vice and drill the two brass inserts out of the casing with a 1/4" or 7/32" drill bit (drill from the back of the sensor...not the front). You'll need to push on the drill as it will only spin the inserts...once they're heated up enough, they'll pop right out.
(3) Clean up the holes with either the drill or (preferred) a small round file.
(4) Reinstall the TPS Sensor on the throttle body. You'll need two small washers on the screws as the holes are now bigger than the screw head. Leave it slightly loose as you're going to have to set the initial Key ON/Engine OFF Voltage before starting the engine.
(5) Reconnect the TPS sensor harness and connect a Digital Volt Meter to the middle terminal on the TPS Sensor (you can poke through the weather-proof connector).
(6) Turn the ignition key ON but do NOT start the engine.
(7) Set the initial voltage (by turning it with your fingers) on the TPS at about .7 volts. (Optimum range is from .7 - .75 volts)
(8) Tighten down the TPS screws and check the voltage one more time (yes...it can move slightly when tightening it down)
(9) Start the engine but do NOT step on the accelerator pedal...let the computer learn the new initial voltage setting.
(10) Turn the engine off and close the hood...drive away of you want...your throttle response should be much more precise now.
Here are some pictures for the various steps:
![]()
Factory TPS Sensor w/Brass Inserts
![]()
TPS Sensor in the vice (ready to drill)
![]()
Modified TPS Sensor Holes
![]()
Modified TPS Sensor reinstalled
TPS Sensor reinstalled with washers
Some have claimed that the TPS Sensor is adjustable on the actual throttle body without any modifications...this is completely false. There is no room for adjustment unless you drill the inserts out.
TPS Modification:
(Applies to '92 -Current models)
Have you ever noticed that slight stumble right off idle when you mash the pedal to the floor? Here's an easy fix for the sluggish response of the throttle (which is related to the TPS Sensor).
Here's a chart that shows the change in the Absolute TPS% that the PCM sees
TPS Voltage Absolute TPS%
------------ --------------
.44v ............. 7.9%
.53v .............10.1%
.685v.............12.5%
.75v .............13.7%
.82v .............15.3%
Check your TPS voltage before doing this modification as none of the factory sensors are calibrated the same. We've seen ranges from .3v-.7v...from the factory. Connect a Digital Volt Meter to the middle terminal on the TPS sensor (with the harness connected and the Key-ON/Engine-OFF). If it's close to .7v...leave it alone.
(1) Remove your TPS Sensor from the vehicle (Located on the drivers side of the throttle body - 3-Wire Connector)
(2) Put the TPS into a vice and drill the two brass inserts out of the casing with a 1/4" or 7/32" drill bit (drill from the back of the sensor...not the front). You'll need to push on the drill as it will only spin the inserts...once they're heated up enough, they'll pop right out.
(3) Clean up the holes with either the drill or (preferred) a small round file.
(4) Reinstall the TPS Sensor on the throttle body. You'll need two small washers on the screws as the holes are now bigger than the screw head. Leave it slightly loose as you're going to have to set the initial Key ON/Engine OFF Voltage before starting the engine.
(5) Reconnect the TPS sensor harness and connect a Digital Volt Meter to the middle terminal on the TPS Sensor (you can poke through the weather-proof connector).
(6) Turn the ignition key ON but do NOT start the engine.
(7) Set the initial voltage (by turning it with your fingers) on the TPS at about .7 volts. (Optimum range is from .7 - .75 volts)
(8) Tighten down the TPS screws and check the voltage one more time (yes...it can move slightly when tightening it down)
(9) Start the engine but do NOT step on the accelerator pedal...let the computer learn the new initial voltage setting.
(10) Turn the engine off and close the hood...drive away of you want...your throttle response should be much more precise now.
Here are some pictures for the various steps:
Factory TPS Sensor w/Brass Inserts
TPS Sensor in the vice (ready to drill)
Modified TPS Sensor Holes
Modified TPS Sensor reinstalled
TPS Sensor reinstalled with washers
Some have claimed that the TPS Sensor is adjustable on the actual throttle body without any modifications...this is completely false. There is no room for adjustment unless you drill the inserts out.
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92 Posts
anyone with a 4.7 actually do this mod?
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77 Posts
ON the volt meter which setting do you set the dial on? Sorry for the dumb question but i haven't worked with one much. Thanks
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405 Posts
I didn't get much of an improvement on mine. The theory is that the QC on these parts is lacking and that they are different. The PCM compensates for this to a point. If I hadn't done it already then I wouldn't do it. But it's no big deal and it doesn't screw up anything. You don't get worse gas mileage. So....your call.
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1,143 Posts
I'll submit a differing opinion. After installing a Fastman TB on my QC the engine performed like a slug - no acceleration and very a noticeable loss of power. I don't know what my TPS reading on the stock TB was, or what it was when I buttoned the Fastman TB onto it. I adjusted the TPS to .604v at idle and it woke the truck up. It is way more drivable now than before this adjustment.
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125 Posts
Hmmm, I wonder if this will work on my Japanese TPS. When I bought it, it wouldn't allow the truck to run at all. This happened with 2 separate cheapy aftermarket TPS's. I ended up buying a Mopar part which had no problems. I sent one of the cheap ones back and I still have the other. Maybe I should give this a shot. Especially if I can perfect the voltage, maybe it'll actual work and give me better throttle response.
I am also wondering about this. I would think that using a scanner reading live data would be easier. Except my scanner reads percentage, not voltage. Would need to know the percentage or find a way to get the scanner to give me the voltage.
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