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Home >> Mazda >> 1997 >> MX-5 Miata L4-1.8L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Engine Mechanical Component Tests
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Engine Mechanical Component Tests

Intake Manifold Vacuum Inspection
1. Verify that the intake-air hoses are installed properly.
2. Stan the engine and let it idle.




3. Measure the intake manifold vacuum by using a vacuum gauge.

Specification: More than 60 kPa (18 in.Hg) @ Idle

4. If not as specified, check following.
- Accelerator cable free play
- Engine compression
- Vacuum leak at:
Fuel injector insulator
Throttle body installation point
Intake manifold installation point
PCV valve installation point

NOTE: Vacuum leaks can be located by engine speed change when lubricant is sprayed on the area where leakage is occuring.
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