TPS troubles
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Tuned
Joined: Jan 2011
Posts: 271
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From: Bluffton, IN
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!
Logistics Pro
Joined: Nov 2013
Posts: 3,922
Likes: 1,192
From: Mojave, Ca
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.
Mountain Pass
Joined: Dec 2010
Posts: 148
Likes: 0
From: Holland, VA
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.
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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Tuned
Joined: Jan 2011
Posts: 271
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From: Bluffton, IN
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.
Logistics Pro
Joined: Nov 2013
Posts: 3,922
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From: Mojave, Ca
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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Tuned
Joined: Jan 2011
Posts: 271
Likes: 0
From: Bluffton, IN
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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Logistics Pro
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Tuned
Joined: Jan 2011
Posts: 271
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From: Bluffton, IN
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!
Mountain Pass
Joined: Dec 2010
Posts: 148
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From: Holland, VA
A picture is worth a thousand words...
IPtoTPSAdapter.jpg Photo by fhafer1964 | Photobucket
Hope this helps!
Cheers
IPtoTPSAdapter.jpg Photo by fhafer1964 | Photobucket
Hope this helps!
Cheers
Senior User
Joined: Jan 2009
Posts: 426
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From: Southwest Florida Coast
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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