The Garage - Repairs
Throttle Position Sensor Replacement!

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Last Updated: 12/3/2013
TPS Replacement

RockAuto, LLC
6680 Odana Road
Madison, WI 53719
Phone: 608-661-1376
Fax: 608-836-5694
Toll-Free: 866-762-5288

Click here to visit their website.

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12-28-2011 - When I was cruising in my Durango I started noticing that the engine began revving randomly while driving between 50 to 60 mph at a steady speed. This was especially noticable while I had the cruise control activated. The revving and assoiated sound did go away when I reached a driving speed below or above. The tranny did always shift on time, but the noise was somewhat similar to a transmission which was low on fluid.

The good thing is that I had some experience with such an issue in the past. I knew that the best approach would be to check and replace the TPS (throttle position sensor) before proceeding any further with any type of investigation.

What is a TPS?: A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle.The sensor is located on the butterfly spindle so that it can directly monitor the position of the throttle valve butterfly. It is a potentiometer, and therefore provides a variable resistance dependent upon the position of the valve. The sensor signal is used by the engine control unit (ECU) as an input to its control system. The ignition timing and fuel injection timing and other parameters are altered as a result.
The location of the TPS on the Durango with the Magnum 5.9l engine is viewed from the driver side pretty much in the center of the throttle body .

I went online and ordered from RockAuto which is one of my favorite replacement part supplier a new TPS which cost me about 36 bucks plus shipping. I opted for the STANDARD MOTOR PRODUCTS version as it does offer brass liners instead of the more simple metal type which are more prone to rust.

The part arrived quickly and I knew the install takes about 20 minutes total. Removing the air filter assembly, disconnecting the bad sensor and installing the new one in it's place. Two Torx screws is all what holds the TPS in place. Putting the air filter assembly back in place, closing the hood and I went out for a test drive. Smooth as butter and no more revving. All in all it was a super easy fix!

As I already said, it's an easy fix and the anoying revving is gone for good. The dealer would have charged somewhat around 250 bucks for such a replacement (incl. parts and service).

The TPS going out after several years of service is not an uncommon problem on many vehicles. I am very happy with my result and for the savings, well, I will probably spend it at Summit Racing Equipment and get myself something cool like some new tools for the garage to tackle the next repair or project!

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