If the ignition has just been turned on, or the engine has just been running, the spark plug may still be very hot!
Removal
Engines 1.7L SOHC
1. Disconnect the negative cable from the battery.
2. Loosen the nuts securing the spark plug wiring for cylinders 2 and 3 (1) and the contact buses for spark plugs for cylinders 1 and 4 (1). Remove the bus from the spark plugs.
3. Unscrew the spark plugs and remove them from the cylinder head.
Engines 1.7L DOHC
1. Remove the air cleaner and engine ECM with support bracket (see Chapter Power and exhaust systems).
2. Disconnect the electrical wiring from the spark plugs - use your thumb and index finger to squeeze the locking tabs and remove the tip from the spark plug tail.
3. Unscrew the spark plugs and remove them from the engine.
2.0L Engines
1. Disconnect the negative battery cable engines with high-pressure turbocharging (Y20DTH) loosen the fasteners and remove the boost tube from the turbocharger above the exhaust manifold.
2. On models of early years of production loosen the fastening nuts (1), remove the washers, disconnect the electrical wiring and remove the glow plug power supply contact bus. On models of recent years, simply disconnect the electrical wiring from the glow plugs.
3. Unscrew the spark plugs and remove them from the engine.
Examination
1. Check the spark plugs for mechanical damage. Burnout or erosion of the tips may be a consequence of malfunction of the injector sprayers. Check the condition of the injectors, replace defective components.
2. Make sure that the spark plug tips are not burnt out - replace them if necessary. If the spark plugs look OK, check them with an ohmmeter (see Removal and installation the oil pressure sensor).
3. The performance of the glow plug can be checked by applying 12 V to it - a working glow plug should glow in a timely manner (be careful not to burn yourself):
- The power supply must be equipped with a fuse to protect against short circuits.
- Clamp the spark plug in a vice with soft jaws - do not forget that its working element will heat up to red-hot.
- After checking, let the candle cool for a few minutes to avoid burning yourself.
The working element of a working spark plug should glow red hot within 5 seconds. If it takes significantly longer to heat up the spark plug, or the tip glows only in the middle, the spark plug must be replaced.
Installation
Engines 1.7L SOHC
1. Carefully screw in the spark plugs and tighten them to the required torque - remember that over-tightening the spark plugs may damage the threads.
2. Place the power bus onto the center terminals of the spark plugs and securely tighten the nuts on the spark plugs of cylinders 1 and 2.
3. Connect the electrical wiring to the spark plugs of the 2nd and 3rd cylinders, tighten the mounting nuts.
4. Connect the negative cable to the battery.
Engines 1.7L DOHC
1. Carefully screw in the spark plugs and tighten them to the required torque - remember that over-tightening the spark plugs may damage the threads.
2. Connect the power supply wiring to the spark plugs.
3. Install the ECM, with support bracket and air cleaner (see Chapter Power and exhaust systems).
2.0L Engines
1. Carefully screw in the spark plugs and tighten them to the required torque - remember that over-tightening the spark plugs may damage the threads.
2. On early models, slide the power strip over the spark plug terminals, attach the wiring, install the washers, then install and tighten the mounting nuts securely. On later models, simply connect the wiring to the spark plugs.
3. If removed, install the metal turbocharger tube, then connect the negative cable to the battery and check the glow plugs for proper operation.
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