Engine Vacuum Leak Tester

Today we will show you how to find a vacuum leak under the hood of your car.

Engine vacuum leak tester.

Pump the tester and observe the vacuum it should hold vacuum if the system is working properly. This reading indicates late valve timing. The engine should snap right back to a steady 17 21 hg vacuum. Even a tiny leak as small as 0 020 of an inch can degrade engine performance compromise driveability and turn on your check engine light.

Using the manifold absolute pressure map sensor or mass air flow maf sensor among others the ecm modulates fuel injector pulse spark timing and valve timing. Important start with the engine cold and avoid. 4 6 out of 5 stars 252. Check engine light.

This leak should be easy to find because it will be making a loud hissing noise. To begin start the engine and let it run until it has reached normal operating temperature. Stinger brand smoke machine leak detector evap smoke tester finds leaks in evap intake exhaust vacuum lines manifolds stinger brand is the best choice in smoke testing. If there is a vacuum leak the ecm may be unable to compensate.

This is done by disconnecting the vacuum tube from the vacuum source engine and attaching it to the tester. By stinger smoke products. This indicates that the engine s intake manifold or the intake gasket is leaking. A vacuum leak is downstream of the device.

Steady low between 5 10 hg vacuum. The simplest to perform is the running vacuum test. Steady low between 10 15 hg vacuum. Ideally it should be on the manifold or below the base of the carburetor.

Find a vacuum port to connect the gauge to. Step 11 a vacuum gauge or tester can be used to check an external system for additional leakage.