Nissens talks through the symptoms of air leaks in a turbo and turbocharged system and presents an example problem and solution to solving this issue.

1. Significant decrease of engine power.
2. Lack of momentary engine response – longer turbo lag than usually.
3. Black smoke from exhaust.

What happens when turbo leaks air?

Air leaks in the system cause an increased load on the turbo, provoking over-speeding and premature, catastrophic failure. Check if the system delivers proper boost pressure and see if any system underboost is related to leak problems. If you suspect a leak, inspect the entire air duct circuit within the turbo system.

How do you know if your turbo is leaking?

Boost Leak Symptoms

1. Slow Turbo Spool. The turbo works by increasing the amount of air and fuel that can be fit into a cylinder; thus, increasing horsepower and performance. ...
2. Loss of Power. ...
3. Check Engine Light. ...
4. Black Smoke from the Exhaust. ...
5. Poor Fuel Economy. ...
6. Poor Idling.

What does a turbo leak sound like?

As the name suggests, a turbo whistle sounds like a high pitched whistle or whining sound, heard when the turbocharger kicks in as you accelerate and the revs go up. For some people, a turbo whistle can be annoying, but to others, it's actually desirable!

What boost leak feels like?

Listen for any hissing noise—this will indicate a boost leak. If the air pressure gauge indicates no buildup of pressure or does not hold for less than a second, that's a sure sign that a major leak exists within the engine.

How to Find Turbo and Vacuum Leaks with the Easy Intake

Should a turbo whistle?

A "turbo whistle" usually indicates a worn and failing turbo bearing, which is pretty much all there is to go wrong with a turbo.

What are symptoms of a vacuum leak?

Here are four signs that your vehicle has a vacuum leak.

• Sporadic Idling. A vacuum leak introduces excess air into the engine, and this directly affects how your engine runs. ...
• Engine Hesitation. Your engine trouble will not be limited to your idling if you have a leak. ...
• Vacuum Sounds. ...
• 4 Check Engine Warning.

Can a turbo leak air?

The air leaks can occur both on the vacuum side, i.e. from the air intake to the turbo inlet, or on the system pressure side, i.e. from the turbo outlet to the engine intake manifold. In any case, leaks lead to air supply shortages in the charge system and will generate various problems.

How do I know if my intercooler is leaking?

The biggest sign that your intercooler is damaged or leaking is that your engine will start to overheat. Since the intercooler is leaking, hot air continues to enter the engine. Your dashboard will signify a noticeable increase in temperature.

What a vacuum leak sounds like?

Hissing or Sucking Noises

Usually, when the leak isn't too bad, you will hear hissing noises coming from the engine. This may also sound like whining sounds or whimpering sounds. For more severe vacuum leaks, the noise is sucking or suction, much like a vacuum cleaner.

How do I know if my engine has a vacuum leak?

Scope out all the vacuum lines under the hood. Then start the engine and spray each connection with a light stream of water. If a connection sucks in the water, you've found your leak. A vacuum leak can cause a rough idle, high rpm, poor gas mileage and even trigger a check-engine light.

Can a vacuum leak cause poor acceleration?

When you have a vacuum leak, the engine will get the wrong air/fuel ratio, which can result in rough or slow acceleration. A vacuum leak can cause a lean mixture and slow acceleration.

At what RPM is turbo activated?

From 1-2,400 rpm, the primary turbocharger is activated; at 2,400-2,800 rpm, the second turbocharger is activated; and beyond 2,800 rpm, both turbochargers function. This system is recommended for diesel engines with displacements of 2.0 liters and above, and V engines.

Why is my turbo fluttering?

That fluttering noise is the sound of a turbo operating in compressor surge, as the compressor 'chops' through the air rather than pushing the air into the engine. Love it or hate it, it's doing nothing good for your turbocharger performance or reliability. This is where a blow-off valve comes into its own.

Why do I hear air when I accelerate?

Rushing air noises during acceleration could be considered a normal part of operation. Even more so with high displacement engines, that rapidly ingest and move a lot of air and gases both through the intake and exhaust systems.

What does a vacuum leak sound like when accelerating?

Hissing Sound

This is a common symptom of a vacuum leak in a car. If caused by a vacuum leak, the hissing sound should come from the engine area when the engine is running. It's like a quiet purr and difficult to hear normally, but experienced mechanics will have no problem detecting it.

Why does my car make a hissing noise when I accelerate?

If the hissing happens when you accelerate, it could instead be a vacuum leak from one of the small hoses around the engine's air intake.

How much play is allowed in a turbo?

While there is always going to be shaft play in a journal bearing turbo, the allowable tolerances we're talking about is 0.003"-0.010" which isn't much to really notice. If you have 0.020" of shaft play, the bearings are worn and it's going to wear at a much faster rate as opposed to bearings that are within tolerance.

How often do Turbos need to be replaced?

However, turbochargers are wearable parts and they will wear down over time. Most turbochargers need to be replaced between 100,000 and 150,000 miles. If you are good at maintaining your car and get timely oil changes your turbocharger may last even longer than that.

How do you check for boost leaks?

Smoke Testing for Boost Leaks: When chasing boost leaks, the humble and effective intake pressure test or smoke test is often used. Pressuring the intake, then spraying soapy water to look for bubbles, or using a workshop smoke tester will give a visual indication of boost leaks.

Can you drive with a blown turbo?

Can I drive my car with a damaged or blown turbo? The short answer is that you can still drive your car with a blown or damaged turbo. However, the longer you drive it in this state, the more damage the engine will have and the more expensive repair bill you will get.