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Reapist
Gen I
 
8/28/2007
17:08:03
|
 Subject: TPS Modification
IP: Logged
Message:
(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.
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Kowalski
GenIII
8/28/2007
18:52:44
|  RE: TPS Modification
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Message:
Great write up !
Luckily, response on mine was crisp from the factory; never had to screw with it.
Lead, follow, or get out of the way
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OldGuy
Dodge Dakota
JOIN HERE
8/28/2007
18:59:59
|  RE: TPS Modification
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Message:
Thats old news, first discovered in 2001
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jjj
Dodge Dakota
JOIN HERE
8/28/2007
19:39:21
| RE: TPS Modification
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Message:
IMO the mod does nothing unless you do not ever reset your pcm. Why - because it read min. throttle upon start up, so once it learns your min. throttle position is now 0.7v, it restarts the plotting from that point.
A far better move is to properly calibrate your min. air flow setting.
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Reapist
Gen I
8/28/2007
20:23:40
| RE: TPS Modification
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Message:
Would any PCM need to be reset? Mine's a 94.
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Kowalski
GenIII
8/29/2007
16:07:05
| RE: TPS Modification
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Message:
Those whose trucks didn't originally have crisp throttle response have reported an improvement after doing this mod.
Lead, follow, or get out of the way
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jjj
Dodge Dakota
JOIN HERE
8/29/2007
19:13:57
| RE: TPS Modification
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Message:
Yea for a couple of days or so, check it out on the DRBIII and you'll see what I mean.
The PCM calculates throttle position from current position - minimum throttle position = calc. angle of throttle open
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DSW
Dodge Dakota
JOIN HERE
8/29/2007
20:03:45
| RE: TPS Modification
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Message:
Kowalski is right, if the truck stumbles off idle the TPS mod works. I had off idle stumble on 1 of my Daks and the mod permanently cured the hesitation.
If you don't have off idle stumble I wouldn't worry about the mod.
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