TPS Help

[RageRover]

Okay, today, the day before Thanksgiving, my truck, on the way back to the family in MI from OH, started doin' its hesitation, and cut outs.

I noticed that when I bank right into a right turn on the freeway doin' 70 mph, she gets weird, not to mention when the throttle is pressed. Now, when the truck is cruising at 2500 RPM and this speed of 70 mph, the throttle is I wanna say a third to half, depending on wind, the way I am turning, and going up hill. She does it bad in these conditions, and today was the worst.

I couldn't stand the jerking, and so I pulled over. I also had to pee real bad too....so as i let the truck idle while I did my business, the truck died down...and I watched the tach drop to like 400 RPM, then the IAC tried to compensate, then she just stalled.

I pop the hood, do a visual, and I check out the coil and wire, I had a DMM with me so I ohmed the primary and secondary windings on the coil...all is good. I ohmed the plug wires and coil wire, all is good. No check engine light is on.

I tested the TPS, and found this....at idle position, 8.5 K Ohms shows, I move it to a slight throttle, and it increased to 10 K Ohms.

I continue to move the throttle, and the readings go back to what they oughta be, then at about half throttle the readings go from 2.9 K Ohms, to 8K-9K Ohms. Then at wide open throttle, the reading is 0.9 K Ohms. This obviously ain't normal....can someone post a comparison of a good TPS Ohm reading threw the ranges from idle to Wide Open Throttle?

Also, would this erratic fluctuation in resistance from the TPS cause a driveability issue with my truck, like hesitation, cut outs and such?

I would imagine it would, and the better for me to replace the sensor, and hopefully get rid of the issue.

Also this issue is not just a freeway driven issue, it happens during accelration sometimes, especially after making any kind of turn through an intersection.

I hope to solve this soon!!

Thanks guys!!

[bernardmann]

Originally Posted by RageRover

Okay, today, the day before Thanksgiving, my truck, on the way back to the family in MI from OH, started doin' its hesitation, and cut outs.

I noticed that when I bank right into a right turn on the freeway doin' 70 mph, she gets weird, not to mention when the throttle is pressed. Now, when the truck is cruising at 2500 RPM and this speed of 70 mph, the throttle is I wanna say a third to half, depending on wind, the way I am turning, and going up hill. She does it bad in these conditions, and today was the worst.

I couldn't stand the jerking, and so I pulled over. I also had to pee real bad too....so as i let the truck idle while I did my business, the truck died down...and I watched the tach drop to like 400 RPM, then the IAC tried to compensate, then she just stalled.

I pop the hood, do a visual, and I check out the coil and wire, I had a DMM with me so I ohmed the primary and secondary windings on the coil...all is good. I ohmed the plug wires and coil wire, all is good. No check engine light is on.

I tested the TPS, and found this....at idle position, 8.5 K Ohms shows, I move it to a slight throttle, and it increased to 10 K Ohms.

I continue to move the throttle, and the readings go back to what they oughta be, then at about half throttle the readings go from 2.9 K Ohms, to 8K-9K Ohms. Then at wide open throttle, the reading is 0.9 K Ohms. This obviously ain't normal....can someone post a comparison of a good TPS Ohm reading threw the ranges from idle to Wide Open Throttle?

Also, would this erratic fluctuation in resistance from the TPS cause a driveability issue with my truck, like hesitation, cut outs and such?

I would imagine it would, and the better for me to replace the sensor, and hopefully get rid of the issue.

Also this issue is not just a freeway driven issue, it happens during accelration sometimes, especially after making any kind of turn through an intersection.

I hope to solve this soon!!

Thanks guys!!

Uhh, yeah...did you get the memo on the TPS reports?

to the first one who can tell me what movie that's from...

[RageRover]

LMAO...that's good.

But I did see something earlier.....I think OkieRover posted, or Yeildsign posted about replacing a TPS and had better results.

Although I wanna know what the correct readings are for the TPS. And if at a possible where I can get ahold of a cheap replacement....cause I see that these suckers can be expensive!

[Kevin88RRC]

Originally Posted by bernardmann

Uhh, yeah...did you get the memo on the TPS reports?

to the first one who can tell me what movie that's from...

"Office Space"

Rage... I think you should be checking volts not the Ohms. With the ignition ON not started, it should swing from about 0.35 at closed to about 4.9 at full.

The Ohms should be between 4-6k with ignition off.

Check your shop manual in case it is different for your 95. If it has a dead spot it could cause hesitation.

[RageRover]

Kevin, you're right I will try the test with the ignition ON and see what I get...although I won't be at all surprised to see any kind of problem with the readings.

Now you mentioned that the sensor at rest in the idle position, with ignition OFF should read 4-6K Ohms right? Cause at rest, my TPS reads 8K Ohms.

[Greg M]

Pat, to my knowledge using the ohm meter is okay. What you want is a "clean, steady sweep" on the scale. If you getting a bounce on the needle or it fluctuates then yes, your TPS is bad. For example, mine was bad at the wide open throttle position - it was smooth right up until wide open and then it would bounce and drop off, which is exactly what my truck would do at WOT. Replaced it with another and all is good.

[RageRover]

Thanks Greg, sounds good.

Well, I had to take the truck to Monroe, MI this past Saturday to show the past owners what I have done to the truck so far. They were amazed of course. But I had to put the original TPS back on there. When I did, and started the drive on the freeway, nothing out of the ordinary happened, just the fact that it was smooth sailing down there. Since then nothin' has happened.

This still doesn't mean I won't get another TPS, I know that thing is bad for a fact, it has like 3-4 bad spots on the whole sensor.