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Discussion Starter · #1 ·
Hi,

I own a 2000 quadcab 3.9L auto 2wd.

I had a bad TPS and when diagnosing I noticed it only showed 3.75V at WOT instead of 4.5V like that haynes book said. I bought a new TPS and get the same readings. Is the book wrong? Am I losing power or snappy downshifts because of the low reading? Anyone know how to adjust this?

Thanks
Ed
 

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The factory TPS is non-adjustable. The PCM adjusts based on differences in the voltages...not the actual voltages, as long as they are in range.

You can 'mod' the TPS, but in my research, in the OBD-II trucks it does nothing.

To 'mod' it take it off, drill the brass inserted out of the TPS, then use the same screws with some washers to attach the TPS back on. This will allow you to adjust the TPS by using a voltmeter.

HTH
 

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Discussion Starter · #3 ·
Thanks for the reply. At this point the dak runs better with the new TPS and passed emissions so I have to assume that the Haynes book quoteing 4.5v at WOT is wrong. As far as moding the tps it is better to file the screw holes up and down into slots than it is to drill them out.

Thanks again
Ed
 
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