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Home >> Jeep >> 1985 >> Wagoneer Base, 2.5 U, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Fuel Injection System - Diesel >> Operation >> Glow Plug System
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Glow Plug System

Engine starting is aided by an electric glow plug system. Glow plugs are small heaters that assist in cold starting. A glow plug is threaded into each cylinder combustion chamber. This system pre-heats each combustion chamber to aid ignition of fuel.

System consists of 4 glow plugs, control switch, timer and a wiring harness which incorporates 4 fused wires (one for each glow plug) located between wiring harness and glow plug terminal.

The glow plug controller and relay cycle 12 volts to these 6 volt heaters, which causes them to heat rapidly. After engine starts, glow plugs remain on between 4 and 10 seconds during initial starting cycle.