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  1. Throttle Position Sensor Management

    The TPS is a three wire sensor that measures the throttle plate opening and its rate of change. This sensor is a variable resistor, also called a potentiometer, that is directly linked to the throttle plate shaft. The TPS outputs a voltage directly proportional to the throttle opening. As the...
  2. "primo" a newbie

    this is my first forum. My full size bronco is a 1991 5.0 liter. automatic. I rebuilt the engine about 20,000 mile ago. I am currently trying to diagnose a problem that someone may be able to help me with. When I am pulling a trailer or a hill, going at a slow speed, 1-5 miles an hour...
  3. Idle / TPS / Upper intake questions

    1980-'96 Bronco Tech
    Couple of questions for you guys on an 86 EFI 5.0. I've been dealing with an erratic idle (revs up high for seemingly no reason, then down, then up, then decides it wants to stumble and or die) problem for quite a while now, and I'm finally fed up with it. I checked and cleaned the IAC, it...
  4. Fluctuating RPM's While Driving? TPS? Vacuum?

    Noobie Bronco Tech Questions. Flame free zone!
    Hi Folks, So Chancho has been running top-notch for the past few weeks and I couldn't be happier! I took him on his first real back country adventure since I did a ton of work to him and he crushed it. This was a relief, considering I'm a beginner mechanic and have very little faith in my...