Engine Vacuum Leak Tester

Steady low between 10 15 hg vacuum.

Engine vacuum leak tester.

A vacuum leak is downstream of the device. If there is a vacuum leak the ecm may be unable to compensate. Important start with the engine cold and avoid. The simplest to perform is the running vacuum test.

To begin start the engine and let it run until it has reached normal operating temperature. The engine control module ecm continuously monitors the environment in the engine. This leak should be easy to find because it will be making a loud hissing noise. This indicates that the engine s intake manifold or the intake gasket is leaking.

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. This reading indicates late valve timing. Ideally it should be on the manifold or below the base of the carburetor. Today we will show you how to find a vacuum leak under the hood of your car.

Pump the tester and observe the vacuum it should hold vacuum if the system is working properly. 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. Find a vacuum port to connect the gauge to.

Steady low between 5 10 hg vacuum. Check engine light. By stinger smoke products. Step 11 a vacuum gauge or tester can be used to check an external system for additional leakage.

This is done by disconnecting the vacuum tube from the vacuum source engine and attaching it to the tester. 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.