RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN C (2002)
Fuel Injector: Testing and Inspection
Fig.14 Fuel Injector Connections
The fuel injectors are located in the top of the cylinder head between the intake/exhaust valves (Fig. 14).
A leaking fuel injector can cause fuel knock, poor performance, black smoke, poor fuel economy and rough engine idle. If fuel injector needle valve does
not operate properly, engine may misfire and produce low power.
A leak in injection pump-to-injector high-pressure fuel line can cause many of same symptoms as malfunctioning injector. Inspect for leaks in
high-pressure lines before checking for malfunctioning fuel injector.
WARNING:
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THE INJECTION PUMP SUPPLIES HIGH-PRESSURE FUEL OF UP TO APPROXIMATELY 120,000 kPa (17,400 psi) TO EACH
INDIVIDUAL INJECTOR THROUGH HIGH-PRESSURE LINES. FUEL UNDER THIS AMOUNT OF PRESSURE CAN
PENETRATE SKIN AND CAUSE PERSONAL INJURY. WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING.
AVOID CONTACT WITH FUEL SPRAY WHEN BLEEDING HIGH-PRESSURE FUEL LINES.
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DO NOT BLEED AIR FROM FUEL SYSTEM OF A HOT ENGINE. DO NOT ALLOW FUEL TO SPRAY ONTO EXHAUST
MANIFOLD WHEN BLEEDING AIR FROM FUEL SYSTEM.
1. To determine which fuel injector is malfunctioning, run engine and isolate each cylinder using DRB scan tool. The DRB scan tool lists the injector
firing order in both cylinder numerical order (1-2-3-4-5-6), and actual firing order (1-5-3-6-2-4).
