Intake Manifold Vacuum Check

Vacuum measurement is a reliable and relatively cheap way to diagnose an engine. According to the readings of the vacuum gauge, you can get an idea of the state of the cylinder-piston group, the tightness of the cylinder head gasket, intake and exhaust manifolds, the correct adjustment of the power supply and exhaust systems, the flow capacity of the exhaust gases, the condition of the valves (their sticking or burning) and valve springs, as well as check the correct adjustment of the ignition timing and valve timing when the engine is running.

1. Prepare the vehicle for inspection (warm up the engine to operating temperature)

2. Disconnect the ventilation hose from the crankcase ventilation valve (PCV) and connecting a vacuum gauge to the ventilation hose (pic. 2.10). Start the engine, check the idle speed of the crankshaft and the reading of the vacuum gauge.



Minimum value on the vacuum gauge: 34 kPa