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Failure to start out falls into two categories: 1) The engine will not turn over – the starter motor will not run Or 2) The engine turns over but will not fire and run. This article will address the primary cause. If you engine turns over but will not fire see my other article. Start by checking the battery voltage. Most Jeeps have a voltage meter on the dash. If the voltage is low – beneath 10 volts, check the following: 1. Fist check to see if there is a cause for the battery to be discharged. Were the lights left on? Doors left open or other power draining accessory left on? If so, turn off the drain and use jumper cables to begin using a charged battery from a dissimilar vehicle. If the battery voltage is normal but the engine still will not turn over, the most mutual cause is one of the safety interlocks. On an automatic transmission there is a Neutral Safety Switch (NSS) that only allows the engine to commence in neutral or park. The contacts in the NSS may corrode and cause the switch to malfunction. Move the shifter back and forth while turning the key to start. Often the motion will cross a spot on the switch that still works. The NSS may be disassembled and cleaned or plainly substituted with a new unit. If the NSS is working the right way but the starter still will not turn, you may have a faulty starter or starter solenoid. The starter and solenoid are substituted as a unit on the XJ Cherokees. However before buying as alternate starter, check the wiring connection on the starter and the trigger wire to the solenoid. Often these connections may become loose or dirty due to the rigors of off road driving. Some persons have reported that starters may be disassembled and cleaned to rectify troubles but I have not tried this procedure. |
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