Friday 3 March 2023

Idle RPM not going up when A/C turned on and it cause the car to vibrate (shaking)

This is quite an intriguing problem that I've not yet do some experiment. The idle is running at 750 RPM without accessories on especially the air conditioning system. Now the interesting part is when the A/C is on the idle RPM refuse to increase and stays at 750 RPM that result in the car to shake (vibrate) feeling like almost stalling. 

The problem is becoming moe intense when braking on traffic light while on gear D and when the A/C compressor kicks in the vibration becoming even more because the idle speed stays around 750 RPM. Why won't the RPM also increase dynamically based on the engine load? 

Suggested solutions:

1. Idle Speed Control Solenoid - dirty / malfunction

2. Adjust the throttle body cable to get more air?

3. Air conditioning gas is over charged thus the compressor magnetic coil consume more power to engage

Will need to experiment this one by one and see the outcome.

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