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Home >> Jeep >> 2008 >> Commander Base, 3.7 K, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (5.7L Engine (Service Information)) >> Manifolds >> Manifold - Intake >> Diagnosis And Testing >> Intake Manifold Leakage

Intake Manifold Leakage

WARNING: This page is about a different variant/trim than selected.

An intake manifold air leak is characterized by lower than normal manifold vacuum. Also, one or more cylinders may not be functioning.

WARNING: USE EXTREME CAUTION WHEN THE ENGINE IS OPERATING. DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR THE FAN. DO NOT WEAR LOOSE CLOTHING.
  1. Start the engine.
  2. Spray a small stream of water at the suspected leak area.
  3. If a change in RPM is observed the area of the suspected leak has been found.
  4. Repair as required.
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