I was getting intermittent throttle position codes, and while playing with actuator in the garage, I was able to get it to do this:
I thought surely it was an actuator issue, so I got a used actuator, and had the same issue.
After doodling around with it, I realized it would stop if I unplugged the TPS up near the oil filter. I had replaced this TPS a couple years back, and made sure not to over tighten the screws, since they're so easy to strip. I wouldn't say the sensor was flopping around or anything, but tightening the screws down stopped this vibration. I was able to loosen them, reproduce the issue, tighten them, and watch it stop, so I'm reasonably confident this was the issue.
If you command the throttle to a specific angle in DIS, and move the TPS back and forth on its screw holes, you can actually watch the plates move as it attempts to follow the set point. My guess is that a loose sensor moves slightly when the throttle is actuated, it tries to move back, the sensor moves again, and it gets caught in a cycle.
Hope this is helpful for someone some day!
I thought surely it was an actuator issue, so I got a used actuator, and had the same issue.
After doodling around with it, I realized it would stop if I unplugged the TPS up near the oil filter. I had replaced this TPS a couple years back, and made sure not to over tighten the screws, since they're so easy to strip. I wouldn't say the sensor was flopping around or anything, but tightening the screws down stopped this vibration. I was able to loosen them, reproduce the issue, tighten them, and watch it stop, so I'm reasonably confident this was the issue.
If you command the throttle to a specific angle in DIS, and move the TPS back and forth on its screw holes, you can actually watch the plates move as it attempts to follow the set point. My guess is that a loose sensor moves slightly when the throttle is actuated, it tries to move back, the sensor moves again, and it gets caught in a cycle.
Hope this is helpful for someone some day!
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