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TPS keeps going Bad?

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Old Jan 25, 2015 | 02:07 PM
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TPS keeps going Bad?

I have a 94 F150 with a 5.0 4wd extended cab? Can anyone tell me why the tps sensor keeps going bad? I have put 3 in in a year so far? Only codes are EGR valve and excessive torque converter slip. Tranny does slam intermittently? Any help greatly appreciated!!!! Thanks in advance!!
 
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Old Jan 25, 2015 | 02:38 PM
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What brand of TPS? What leads you to change it?
 
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Old Jan 25, 2015 | 02:41 PM
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I put one in from Oreiley's and one from NAPA, Service center tested and said bad an replaced? Brand I don"t know.
 
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Old Jan 25, 2015 | 03:06 PM
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I would be inclined to test the TPS. I would ohm it out first. Then check voltage for closed and then watch for voltage spikes or dips from closed/stopped voltage to full WOT.

And because the TPS is so very important to electronic transmission, I only use OEM, Motorcraft. Same would hold true for Dodge, GM and so forth. Its usually not worth my time to justify a few dollars saved if I cant rule out that being part of the problem.
 
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Old Jan 25, 2015 | 03:13 PM
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I am going to take to shop this week. Have test tps and replace mlps. Son said killing when put in reverse now! Thanks for help!
 
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Old Jan 25, 2015 | 03:35 PM
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Aftermarket TPS sensors tend to have very poor quality control. But before throwing in the towel it would be advisable to check it yourself with a meter.
 
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Old Jan 25, 2015 | 06:26 PM
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There is a good reason that the Motorcraft one costs 4 times as much. You do get what you pay for.
 
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Old Jan 25, 2015 | 07:13 PM
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Sounds like time for a TPS how to.

Part 1 -How to Test: Throttle Position Sensor (1988-1995 Ford 4.9L)
 
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Old Jan 25, 2015 | 07:59 PM
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Excessive torque converter slip will cause the Tranny to slam.
 
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