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Engine does not start or starts poorly.

You only hear a tap when turning the ignition.

The bendix is ​​a small gear on the starter motor that, when energized, slides forward and engages the starter ring gear located on the flywheel. If you only hear a tap, the gear will not fall into the ring or come out. There can be various causes for this. Such as a low voltage of the battery, a dirty starter motor or wear on the starter motor. A temporary solution could be to tap the starter motor with a hammer while starting and, if you can reach it, spray the bendix with WD40.

When turning the ignition switch, the starter motor sometimes turns and sometimes doesn't.

The starter relay is defective. This can be caused by burnt-in switch contacts. In an emergency it is possible to short the two contacts on the relay with a thick screwdriver. With most starter motors it is possible to open the starter relay and clean the switch contacts with fine emery cloth. If this is not possible, the starter motor must be taken away for overhaul or exchanged for an exchange starter motor. It is also possible that the ignition switch is not completely in order. A good multimeter is a must for electrical faults.

Engine turns too slow to start.

The battery no longer has enough capacity to rotate the starter motor fast enough and / or the contacts of the starter cables are oxidized.