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A vacuum leak can cause many different problems with your car engine and even more if you do not fix it as soon as possible.But how can you locate the vacuum leak, and are there any methods you can use without buying all fancy tools?There are actually several methods you can use to find a vacuum leak. Some more reliable than others, so lets begin!How to find a Vacuum LeakThe easiest way to find a vacuum leak at home without using any tools is to carefully spray a flammable liquid around the areas where you suspect the leak may be coming from when the engine is idling. If the engine RPMs increase, its a vacuum leak there.This method can be dangerous if you are not careful, as you can cause your car to catch fire! We always recommend using the right tools to find vacuum leaks! Do it at your own risk, and always do it outdoors. Keep a fire extinguisher nearby. (Note: Never spray near hot parts or ignition parts.) These steps should only be done by professionals!Go further down in the article to find more safe methods.Total Time: 5 minutes The first step you should take before you go further into this guide is to check all the vacuum hoses for cracks or completely broken hoses. Vacuum hoses are made of rubber material, which will become hard and start to crack after some years in the engines heat. Replace any faulty vacuum hoses you can find. If you couldnt find any cracked or leaky vacuum hoses or other parts in the engine bay, it is now time to fire up the engine. Apply the parking brake, put the gearbox in Neutral or Park, and fire up the engine. Be careful not to touch any moving or hot parts during this guide! To continue this guide, you need a flammable fluid in spray or gas form. You can use starter spray, brake cleaner, carburetor cleaner, or propane gas from a propane torch, for example. We do strongly recommend using a carburetor cleaner or propane torch for these steps. Take the spray and try to locate where the intake manifold is connected to the cylinder head, and carefully spray around the connection here on each cylinder. If the cars RPM changes or starts to sound weird, your car most likely has a bad intake manifold gasket. You can also try to spray around other suspected areas on the intake manifold if its divided into several parts. Locate where all the vacuum hoses are connected on the intake manifold and spray around the connections of them. Even if they look good, there can be small cracks in them that are leaking. You can also follow the hoses and spray the other end of them. If the engine RPM gets higher or lower, you have definitely found a vacuum leak. The brake booster builds a vacuum with a one-way valve to make sure you do not have to press super hard on the brake pedal to brake. Spray around the connection to it and other areas around the brake booster to try locating any leaks. You have to be very carefully listening to the engines RPM here, though, because t is so far away from the engine, so it is not sure that it will be noticeable. Look around the intake manifold and follow the vacuum hoses to find solenoids and actuators connected to the vacuum system. These solenoids and actuators are often made of plastic, which can crack with time. Spray around these, especially if they have axles attached to the intake manifold like in the picture above. Replace faulty actuators or solenoids if you find a leaky one. Now we have one last step to check, and it is the gasket between the throttle body and the intake manifold. Your throttle body is bolted with 3 or 4 screws into the intake manifold, or there is often a rubber or paper gasket between these two parts. It happens that this gasket goes bad and starts to leak. Spray around other areas around the throttle body also to check for leaks.Estimated Cost: 5 USDOther Methods to find Vacuum LeaksSo if you think the guide above is a little bit too risky with flammable fluids, you can also use other methods. Here are three different ways you can use to find vacuum leaks!RELATED: 6 Symptoms of a Vacuum Leak & Causes1. Visual and Listening ChecksIn some cases, it is straightforward to locate vacuum leaks just by looking at the components in the engine bay. Check for any cracked or broken vacuum hoses or other signs that there is a leak. Often around a leak, it can be a little bit of oil also, so look for signs of oils around the intake.Vacuum leaks often cause high pitch sound on idle also, and you can usually locate the leak by just listening with your ears. Be careful not to touch any moving or hot parts while listening, though.2. Soap & WaterYou can also use soap and water to find leaks around the intake. However, this method is more effective when the air is pushed out – and not sucked in like a vacuum leak. With the soaps help, you should be able to see where the leak is coming from. To be honest, I havent tried this method very much, and it is up to you if you want to do it.3. Use an EVAP smoke machineThis is the method for professionals that want to find vacuum leaks super fast in a very safe way. The downside is that you need an EVAP smoke machine, which can often cost over 1000$, and it is probably nothing you have in your garage.However, if you have the luck to borrow one from a repair workshop, you should definitely do it. If you own a workshop and do not have a smoke machine, it is strongly recommended. You will save a lot of time in troubleshooting.Find a Vacuum Leak FAQYou can spray anything flammable fluids, but be careful with any materials that can damage the engine. We recommend only use carb cleaner, brake cleaner, propane gas, or starter spray.Yes, carburetor cleaner works really well for this job, and it is actually one of our recommended fluids to use to find vacuum leaks. Yes, you can use starter fluid to find a vacuum leak. However, in our opinion, it is a little bit too flammable for this job and is a little bit dangerous. Brake cleaner or carb cleaner works better.Yes, using a brake cleaner works very well for the job of finding a vacuum leak. It depends slightly on different brake cleaner brands, but make sure that the brake cleaner is not too much or too little flammable. Was this article helpful?
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