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Old 12-02-2013, 09:54 PM
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Forddiesel17 Forddiesel17 is offline
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TPS troubles

I just replaced the ip in my dads 94 and started to adjust the tps and I can't get the voltages anywhere near close enough. It is a brand new tps. I have 4.99 volts to the constant wire but the center I can only get .44 volts at idle and the most I ever got was .70 at WOT. I'm starting to wonder if I have the adapter that you put on the throttle shaft is in the wrong position. Does it go on a certain way? Thanks in advance guys!
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Old 12-03-2013, 11:25 AM
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Anyone? Gotta get this truck running as it's my dads snow plow truck.
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Old 12-03-2013, 12:03 PM
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Did you buy the Sensor from autozone/duralast? If so, return it! I'm replacing a TPS sensor today. I've read that the connector terminals has a tendency to spread out and stop making a good contact against the TPS. The connector can be taken apart and the terminals squeezed back together with some pliers. Napa sells just the TPS pig-tail if it needs to be replaced. The only other thing is to make sure your Multimeter has a good ground and that youre back-probing is successful.
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Old 12-03-2013, 12:08 PM
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And make sure your IP has the adapter on the throttle shaft. Without that you won't get any change in voltage readings...as I found out and posted about yesterday.

Good luck.

P.S. O'Reilly's sells the TPS connector for eight bucks if'n your pig tail is bad.
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Old 12-03-2013, 12:56 PM
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Does that adapter go in a certain way? I didn't pay attention when I took it off. And I got the tps from napa but maybe it is bad out of the box. I might try the old one and see what it does.
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Old 12-03-2013, 02:07 PM
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I didnt take off the adapter, I simply removed the 2 t-15 torq screws. I do have some specs for you based on my new NAPA sensor. Between terminal A and B, there should be 380 ohms when the sensor is relaxed. When you twist the potentiometer, the resistance should rise to 3.5K ohms. I think your sensor is fine and you just have it clocked wrong. Heres how I clocked mine; Install the sensor into the bracket/adapter with the connector at the 12 oclock position. Then rotate the sensor counter-clockwise til you feel the potentiometer begin to wind up. The TPS connector was at the 9 o'clock position on my engine. The screw holes should be pretty close. Install the screws and check the voltage with your multimeter. If its not close, loosen up the t-27 torq screws on the pump and adjust the bracket.
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Old 12-03-2013, 05:07 PM
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Well the pump shop took off the adapter with the flat spot on it off the shaft when they rebuilt it but didn't mark where it was and I didn't think to mark it. What position is that adapter on your truck?
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Old 12-03-2013, 06:14 PM
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The set screws are at the 9 o'clock and 12 o'clock position at idle.
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Old 12-03-2013, 06:16 PM
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Ok thanks! That should help me out a lot. I don't have a chance to work on it tonight but should by the weekend. If I got more trouble I will be sure to post. Thanks for your help so far!
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Old 12-03-2013, 06:59 PM
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A picture is worth a thousand words...

IPtoTPSAdapter.jpg Photo by fhafer1964 | Photobucket


Hope this helps!

Cheers
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Old 12-04-2013, 04:27 PM
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I'm not sure if my memory is working. bit iirc there is a little pinkish plastic piece under that adapter and if that is positioned wrong you will never get the right settings. anybody else remember this? if I can I will look on my truck later and try to post pics
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things replaced or rebuilt-injection pump, injectors return lines glo plugs,lift pump,alternator,starter, battery cables,batteries, belts,oil cooler, transmission-all lines, and sensors, bed, radio/cd, yada yada yada

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Old 12-04-2013, 04:27 PM
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