Jeep Cherokee

 Service Manual

Engine » 2.5L engine » Diagnosis and testing
Intake manifold leakage diagnosis

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.

Engine diagnosis-introduction

Service diagnosis-performance

Service diagnosis-mechanical

Intake manifold leakage diagnosis

Cylinder compression pressure test

Engine cylinder head gasket failure diagnosis

Cylinder combustion pressure leakage test

Engine oil leak inspection

Engine oil pressure