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 printable version
Checking the engine by means of the vacuum gauge
Fundamentals and arrows gauge fluctuations in the diagnosis of malfunctions of the engine
Using the gauge, you can get information about the state of the engine and determine that the broken cylinder head gasket, damaged ring properly regulated power system, damaged valves and so on.. Unfortunately, the testimony of the gauge can be misinterpreted, so these measurements should be used only in combined with other methods of checking the engine. For the correct definition is important as the absolute value of the vacuum reading, and their rate of change.
| PERFORMANCE ORDER | | 1. Connect the vacuum gauge to the intake manifold. Start and warm up the engine to normal operating temperature. | 2. Read the gauge readings. If the engine is in normal condition, the gauge readings should be 430-560 mm. Hg. Art., and the arrow vakuummet RA should stand still.
Low constant gauge readings indicate that the damaged gasket between the intake manifold and the throttle body, vacuum hose is damaged, improperly installed ignition timing or incorrect timing.
If the reading on the gauge below norm 80-200 mm. Hg. Art. and fluctuate, it may be damaged gasket intake manifold near the inlet or faulty injector.
If the readings are constantly falling to 50-100 mm. Hg. Art. of relatively stable values, it may be damaged valves. In this case, you need to measure the engine compression.
If the readings are falling, but not regularly, then maybe it jammed valve or a malfunction occurs in the ignition.
Small fluctuations around 25 mm. Hg. Art. usually associated with failures in the ignition system.
If the readings vary greatly, it may be damaged cylinder head gasket or cylinder.
If the needle is slowly moving in a wide range of values, it may be clogged PCV damaged intake manifold gasket or seal between the throttle body and the manifold. | | 3. Check how fast the gauge readings are restored after a sharp and full throttle and return it to its original position. If the engine is in a normal state, indications fall almost to zero, and then increases by about 130 mm. Hg. Art. above the norm and again decrease to former values at constant idle. If the readings are restored slowly and pass through a maximum after the closing of the throttle, then maybe damaged piston rings. If there is a long delay, it is possible that the exhaust system is clogged. |
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