7. Intake Restriction: Purpose:
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This purpose of this test is verify an air intake or exhaust restriction is not contributing to a low power condition. If the engine does have a high air intake restriction, a considerable amount of black or blue smoke may be produced.
Intake Restriction
- Check air filter restriction gauge/indicator.
- Measure the vacuum on clean side of air inlet system at wide open throttle (WOT) with a Magnehelic® gauge.
| Instrument | Specification | Measurement |
|---|---|---|
| Magnehelic/Filter Restriction Gauge | 3.7-46.7 mm-Hg (2-25 H2 O) |