Removal
Warning. If the glow plug system has just been energized or the engine has recently been running, the glow plugs may be very hot.
1. Disconnect the ground cable from the battery (see "Disconnecting the battery").
2. On models with a 1.9L D9B engine, remove the air distribution housing. If necessary, also remove the air intake duct and disconnect the vent hose from the oil filler pipe. For more information, please contact chapter 4B.
3. On 1.9L models with a top cover, release the clips on the right side and top of the engine cover, then carefully remove the cover so as not to lose the rubber mounts. On 2.0L models, release the tabs (turn them 90° to release) and remove the engine cover.
4. Loosen the nut on the terminal of the corresponding glow plug and remove the washer (figure 2.4). Note that the main power cable is connected to the glow plug of cylinder No. 1 and install a jumper wire between the four spark plugs.
Figure 2.4. Unscrew the nut (marked with an arrow) and disconnect the electrical connector at the glow plug terminal (the later 1.9L engine is shown)
5. If applicable, carefully move the lines or wires aside to allow access to the appropriate glow plug.
6. Unscrew the glow plug and remove it from the cylinder head (figure 2.6).
Figure 2.6. Unscrew the glow plug and remove it from the cylinder head (shown is a 2.0L engine with the fuel rail removed)
Inspection
7. Inspect each glow plug for mechanical damage. Burning or corrosion of the glow plug tip can be caused by poor nozzle spray pattern. If such damage is detected, check the injectors.
8. If the spark plugs are in good condition, perform an electrical test using a 12-volt test lamp or continuity tester as described in the previous paragraph.
9. To ensure that the glow plugs heat up evenly and in approximately the same time, apply 12V to them to activate them. Observe the following precautions:
- a) Clamp the glow plug being tested in a vice or a self-tightening wrench. Remember that it gets red hot when working.
- b) Make sure that the supply or test lead has a built-in fuse or circuit breaker (overload tripping), designed to prevent damage due to short circuits.
- c) After checking, allow the candle to cool for a few minutes before handling.
10. The tip of a functioning glow plug glows red-hot after applying current to the plug for approximately 5 seconds. A glow plug that begins glowing significantly later or that begins glowing in the middle rather than at the tip is considered faulty.
Installation
11. Installation is carried out in the reverse order of removal. Apply a small amount of copper-based grease to the spark plug threads and tighten the spark plugs to the specified torque. Do not exceed the specified tightening torque as this may damage the spark plug.