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With engine running but in ‘P’ I slowly press the accelerator pedal to increase the engine Revolutions Per Minute(RPM), the engine will all off a sudden spike in RPM. Going from idle RPM to 3000RPM.
While trying to drive the car at a constant speed, like 40kph, this spike in RPM won’t let you maintain a constant speed because the throttle in the engine is open too wide. It will either be accelerating or decelerating (on/off) causing jerk/surging when trying to maintain this speed.
I have attached a scanner and can confirm the Throttle Position Sensor(TPS) is not in sync with the Accelerator Pedal(AP).
With the engine running and in ‘P’ I press the AP to about 1%, this will cause the TPS to go to 10%.
With the engine OFF but ignition ON and I press the AP, the TPS is closely in sync. 4%AP = 5%TPS. 10%AP = 10%TPS
It seems like the ECM is trying to start accelerator movement from the TSP resting position of 8.6% and not ~3.5% that it uses to control idle.
This problem is affecting older Accent models and it seems similar to issues described with other Hyundai/Kia models.
Melbourne, vic, Australia