bad TPS?
#1
bad TPS?
Im trying to run down an electrical issue in my fuel system (L99)
Every so often when I go to take off, my pedal will just dye. No response for about a half inch. If I mash it then it will pick back up. Its not every time, and I cant figure out a common denominator when it does happen other then using the pedal. . . Itll dive from 2k on the tach to 1500 and just keep bouncing between there. First gear is the worst, it hasnt really done it in fourth yet. I think Ive checked all mechanical stuff, wiring harnesses, oil lines. Im not leaking any oil from anywhere, I forgot to mention my fuel pressure doesnt move at all when it happens.
Ive got a TPS on the way just in case thats what it is figured Id check in and make sure im not missing anything.
I guess its technically a pedal position sensor? Trying to get torque logs figured out
Every so often when I go to take off, my pedal will just dye. No response for about a half inch. If I mash it then it will pick back up. Its not every time, and I cant figure out a common denominator when it does happen other then using the pedal. . . Itll dive from 2k on the tach to 1500 and just keep bouncing between there. First gear is the worst, it hasnt really done it in fourth yet. I think Ive checked all mechanical stuff, wiring harnesses, oil lines. Im not leaking any oil from anywhere, I forgot to mention my fuel pressure doesnt move at all when it happens.
Ive got a TPS on the way just in case thats what it is figured Id check in and make sure im not missing anything.
I guess its technically a pedal position sensor? Trying to get torque logs figured out
#3
#4
#5
These are basic Potentiometers that inhibit voltage to the PCM by way of resistance (5 vRef pull-down circuits). Scantools often miss the event all together. A better tool is a Lab-Scope or Graphing Meter if you have access to one.
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DanielT28
1994.5 - 1997 7.3L Power Stroke Diesel
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06-17-2015 11:02 PM