Removal
1. Disconnect the ground cable from the battery.
Warning: If the car radio in your car is coded, make sure you know the code before disconnecting the battery.
2. When working on the F9Q engine, remove the plastic cover from the right engine mount, then disconnect the high-pressure fuel lines from the fuel pump and injectors as described in Chapter Power and exhaust systems.
3. Unscrew the nuts from the glow plug terminals and remove the washers. Disconnect the wiring (refer to the accompanying illustration). Note that the main supply wire is connected to two spark plugs.
4. Carefully move the tubes or wires to the side to improve access to the glow plugs.
5a. Remove the glow plugs.
5b. Remove them from the cylinder head (refer to the illustrations).
Inspection
1. Inspect each glow plug for physical damage. A burnt or broken glow plug tip can be caused by poor fuel atomization by the injector. Check the injectors if you find this type of damage.
2. If the glow plugs are in good physical condition, check them as described in the previous Section.
3. Glow plugs can be powered by applying 12V to them. Observe the following precautions when working with glow plugs.
- a) Hold the glow plug in a vice or self-locking pliers. Remember that it gets very hot.
- b) The power supply or test lead shall contain a fuse or overload indicator to protect against short circuit.
- c) After checking the serviceability, allow time for the glow plug to cool down.
4. A glow plug tip in good condition will glow red hot within 5 seconds. If the plug glows more slowly or if the middle glows rather than the tip, it should be replaced.
Installation
1. Install in reverse order. Apply a small amount of copper anti-seize compound to the spark plug threads and tighten the glow plugs to the torque specified in the Specifications. Do not overtighten, this may damage the glow plug heating element.
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