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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (3.7L Engine (Service Information)) >> Manifolds >> Manifold-Intake >> Diagnosis And Testing >> Intake Manifold Leaks

Intake Manifold Leaks

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 (spray bottle) at the suspected leak area.
  3. If engine RPM'S change, the area of the suspected leak has been found.
  4. Repair as required.
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