Here is my experience:
1. Do you hear the servo clicking when you turn the key? It could be that the cable/linkage isn't tight. Another possibility might be that there is a kink or issue with the cable where it isn't able to move smoothly. You can test this by running a servo test- look it up online or youtube. This would require a new linkage cable.
2. Another thing the servo test can help identify is if the servo motor is getting locked up. Mine rusted, which locked up the system. PerfectPass would say it is engaged, but it wasn't. I would break it free from the bind by using a wrench, but that only lasted a few weeks before it was locked completely. I ended up just purchasing a new servo motor. To prevent future rusting, I angled the servo motor down, so water could not run/splash into the motor.
3. Where the throttle body connects to the linkage is important. Placement is key, but tough to perfect. You want it tight enough that the PerfectPass engages effectively without slack, but loose enough that your engine doesn't increase RPMs at idle. There is an L-bracket that you might want to test flipping around.
4. Lastly, there is a way to adjust the amount the servo responds and how quickly it reacts. Search PerfectPass KDW and play around with that.
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