How to Troubleshoot the Ignition System in a Geo Trackerby Contributor; Updated November 07, 2017
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How to Troubleshoot the Ignition System in a Geo Tracker. Checking your Geo Tracker's ignition system for problems is relatively simple. It mainly involves testing each of the spark plugs and wires to make sure a good spark comes from them. The process differs, however, depending on whether the system has a distributor or not.
Label and disconnect the fuel injectors, Idle Air Control valve wiring harness and Throttle Position sensor from the connectors. This is especially true of a Tracker with a Tfi/MFI engine and prevents gas vapors from leaking out of the air intake.
Remove the number 1 cylinder's spark plug wire, but leave the spark plug in place. Install a spark tester into the wire and ground the tester against a metal part of the engine.
Have another person crank the engine for a couple of seconds while you watch the tester. Look for a visible blue-white spark.
Check for damage to the ignition coil, distributor spark plug wire or plug itself if no spark or one of a different color appeared.
Replace the spark plug wire in its cylinder. Repeat all of the above for each wire. Reattach all components you removed after all testing is finished.
Detach the fuel injector wiring harness connector to keep fuel out of the spark plug holes.
Remove the ignition coil and spark plug, then attach the ignition coil connector to the coil. Insert the end of the spark plug into ignition coil and ground its electrode to a metal part of the engine.
Watch over the spark plug electrodes while someone else cranks the engine for 3 to 5 seconds. Look for a strong blue-white spark. Check the spark plug, ignition coil and igniter for malfunctions if a yellow spark or no spark appears.
Reinstall the spark plug and ignition coil and repeat the process for each spark plug.
Wear rubber gloves and hold the wires with insulated pliers.