Why Is My Car Not Idling Properly?

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Is your car idling when it should be idling calmly? It’s a common concern for car owners, and understanding the reasons behind this problem can be crucial for maintaining your vehicle’s performance. In this article, we’ll delve into the possible causes of erratic idle speeds and provide insights into how Moreleta Service Centre, with over 25 years of experience, can help you get your car back to smooth idling.

Common Culprits for High Idle

1. Air Intake Issues

If your car’s air intake system is compromised, it can lead to an imbalance in the air-fuel mixture, causing the engine to idle at erratically.

2. Idle Air Control Valve

The Idle Air Control valve sends a signal to the engine control module to adjust the idle speed on most fuel injected vehicles. The most common problems affecting an Idle Air

Control valve are:

  • Motor circuit failure
  • Carbon build up

Carbon buildup in the bypass port and internal motor circuitry faults that may hinder its operation or render the IAC motor inoperative.

2. Throttle Position Sensor (TPS)

The TPS plays a crucial role in regulating the throttle opening. The TPS measures throttle opening rate and sends the corresponding voltage signal to the computer. If the TPS sends an incorrect signal to the engine control module at idle, the computer will command the Idle Air Control valve to respond accordingly. A malfunctioning TPS can result in erratic idling.

3. Vacuum Leaks

Leaks in the vacuum system can disrupt the engine’s idle stability. Vacuum leaks cause different symptoms, including low idle problems from the unmetered air entering the engine. Trying to establish the source of the leak can be challenging. Our skilled technicians make use of our in house strategies, common tools, and a vacuum pump to help locate leaks faster.

4. Ignition System

A correct spark is essential to ignite the air fuel mixture in the combustion chamber. A weak spark in one cylinder can cause a low or rough idle. If your vehicle experiences intermittent misfires, we highly recommend rectifying the problem to avoid damage to other related components.

5. Throttle Body

After extended millage, carbon builds up in the throttle around the shafter, housing and throttle plate. This restricts the ability of the throttle body to open and closes properly. On modern vehicles, the TPS is integrated into the throttle body is also responsible for controlling the idle speed. If the throttle body is cleaned and the problem still persists, it could be that the entire unit will need replacement and calibration thereafter.

6. Engine Coolant Temperature Sensor

The engine coolant temperature sensor sends a signal to the engine control module to indicate operating temperature. The sensor aids the engine control module when to enrich or lean the air-fuel mixture, depending on engine temperature.

A defective coolant temperature sensor sending an incorrect signal can thereby drastically affecting the idle speed.

Frequently Asked Questions

Q1: What are the symptoms of a faulty throttle position sensor?

A: A malfunctioning TPS can cause issues such as erratic idling, stalling, and poor acceleration. If you notice these symptoms, it’s advisable to have your TPS inspected by our expert technicians.

Q2: Can vacuum leaks be fixed without professional assistance?

A: While some vacuum leaks may have DIY solutions, it’s often challenging to locate them without proper tools. Our technicians have the expertise and equipment to identify and fix vacuum leaks efficiently.

Q3: Is a high idle speed harmful to my engine?

A: Yes, prolonged high idle speeds can lead to increased wear on engine components and negatively impact fuel efficiency. Seeking prompt assistance from Moreleta Service Centre can prevent further damage.

Conclusion: Trust Moreleta Service Centre for Reliable Solutions

Erratic idle speeds can be a sign of underlying issues in your vehicle, and addressing them promptly is crucial for optimal performance. Trust us to diagnose and resolve your car’s idling issues effectively.

Let’s get your car back to idling smoothly!

Moreleta Service Centre is RMI accredited with MIWA 5-star grading.

Allow Moreleta Service Centre to take care of your vehicle the best way we know how.

Contact Moreleta Service Centre:

Address: 1279 De Villebois Mareuil Dr, Moreleta Park, Pretoria, 0181

Phone: 012 111 9383

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