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Check with a vacuum gauge
Vacuum meter Typical indications of the vacuum gauge 1. Low constant pressure
2. Low pressure changes
3. Regular pressure surges
4. Erratic pressure surges | 5. Fast vibration arrow
6. Strong pressure fluctuations
7. The constant pressure drop |
Connect the meter to the intake manifold. Warm up the engine and let it run at idle. If the motor is defective, the meter should show 17-22 inches, and the arrow should be uniformly twitch. If the meter below the required, the likelihood of the following reasons: proceeds gasket between the intake manifold and carburetor or throttle proceeds vacuum hose, not adjusted ignition angle or the angle of rotation of the camshaft. If the meter below normal by 8 inches - flowing intake manifold gasket or defective injector. If the needle falls at regular intervals to 2 inches below the normal level of - flow valves. If the arrow is highly uneven jerks down - jammed valve or spark plugs. Vibration arrows on the four-inch exhaust gases - worn valve guides. Fast vibration with increasing engine speed - flowing intake manifold gasket or head, the valve springs are worn out, burned valves or faulty spark. Weak twitching arrows around a normal level of 1 inch - the problem with the ignition. Strong twitching hands - spoiled cylinder head gasket. If the arrow slowly deviates over long stretches - incorrectly mixed fuel flowing intake manifold gasket or choke. Increase the engine speed to 2500 and stop the engine, the arrow should fall almost to zero, and then climb to 5 inches above the normal mark and return to the normal mark. If it does not, then the worn piston rings. If there is a long delay - clogged exhaust system.
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