If your car’s engine is running rough, lacking power, or stalling frequently, it could be a sign of a vacuum leak. Vacuum leaks are a common problem that can cause all sorts of engine issues. In this post, I’ll explain what vacuum leaks are, the symptoms to watch out for, and what’s involved in getting them fixed.
What is a vacuum leak?
Your car’s engine is essentially a big air pump. It uses vacuum pressure to suck in air, which it mixes with fuel to create combustion. Sensors monitor the amount of air entering the engine so the computer can add the right amount of fuel for optimal performance.
A vacuum leak happens when there’s an unwanted hole or crack somewhere in this system, allowing unmetered air to enter the engine. This throws off the air-fuel mixture and can cause all sorts of drivability problems.
Symptoms of a vacuum leak
Some of the most common signs of a vacuum leak include:
- Check engine light is on
- Rough, uneven, or high idle
- Engine stalling or misfiring
- Hissing or sucking sound from the engine bay
- Reduced fuel economy and engine performance
If you notice any of these symptoms, it’s a good idea to have your car inspected by a mechanic as soon as possible. Vacuum leaks can be tricky to diagnose, but the longer you wait, the worse the problem can get.
Common causes of vacuum leaks
Vacuum leaks can develop from a number of causes, such as:
- Cracked or loose hoses and tubes
- Faulty gaskets and seals
- Damaged intake manifold
- Malfunctioning EGR valve, PCV valve, or brake booster
Over time, rubber hoses and seals can dry out and crack from the heat of the engine. Improper installation or engine work can also compromise the vacuum system.
Vacuum leak repair
To fix a vacuum leak, the faulty component needs to be replaced. This could be as simple as swapping out a cracked hose or as involved as replacing the intake manifold gaskets.
Diagnosing a vacuum leak typically starts with a visual inspection to check for obvious cracks or disconnected hoses. A smoke test may be performed, which involves pumping smoke into the intake system to reveal leaks. Your mechanic may also use a scan tool to check for trouble codes.
Vacuum leak repair cost
The cost to fix a vacuum leak can vary depending on the cause and your vehicle make and model. On average, you can expect to pay anywhere from $150 to $1,000 in New Zealand.
Something simple like replacing a vacuum hose might only cost $150-$300, while major repairs like replacing the intake manifold could run upwards of $1,000. It’s best to have the problem diagnosed first to get an accurate estimate for your specific situation.
Get your vacuum leak fixed with My Auto Shop
If you suspect your car has a vacuum leak, My Auto Shop is here to help. Our mobile mechanics can come to you to diagnose and repair vacuum leaks and other engine problems. We offer upfront, transparent pricing and prioritize customer service.
With hundreds of locations across New Zealand, expert mechanics, and a strong track record, you can trust My Auto Shop for all your car repair needs. Book online now and let us get your car running smoothly again.