What are the Main Causes a Car Would Start but Not Idle
When a car starts but won't idle, it can be a frustrating and potentially dangerous situation. There are several common reasons why this can happen:
- Vacuum leak: A leak in the vacuum system can cause the engine to run lean, making it difficult for the car to idle.
- Faulty idle air control valve (IACV): The IACV is responsible for controlling the amount of air that flows into the engine when it is idling. A faulty IACV can cause the engine to idle too high or too low.
- Dirty throttle body: A dirty throttle body can prevent the engine from getting the correct amount of air, which can lead to idling problems.
- Faulty fuel injector: A faulty fuel injector can cause the engine to run lean or rich, which can make it difficult to idle.
- Weak battery: A weak battery can cause the engine to run erratically, which can make it difficult to idle.
Related Questions
What are the symptoms of a vacuum leak?
- Whistling or hissing sounds coming from the engine, rough idling, and reduced power.
How can I check if my IACV is faulty?
- Use a multimeter to test the voltage and resistance of the valve.
What are the signs of a dirty throttle body?
- Rough idling, poor acceleration, and a decrease in fuel efficiency.
What causes a fuel injector to become faulty?
- Clogging, wear and tear, or electrical problems.
Can a weak battery prevent a car from idling?
- Yes, a weak battery can cause the engine to run erratically, making it difficult to idle.
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