If your 1997 Toyota 4Runner is cranking but not starting, and you suspect a lack of spark, there are several potential causes to consider:
Ignition coil failure: While it is rare for all ignition coils to fail simultaneously, it's still possible for one or more of them to malfunction. A faulty ignition coil can result in no spark being delivered to the spark plugs. You can try testing the ignition coils using a multimeter or consult a mechanic for further diagnosis.
Ignition module failure: The ignition module controls the timing and firing of the ignition coils. If the ignition module is faulty, it can prevent spark generation. Testing the ignition module requires specialized equipment and is best done by a professional.
Crankshaft position sensor (CKP): The CKP sensor detects the rotation of the crankshaft and sends signals to the ignition system. A malfunctioning CKP sensor can lead to a lack of spark. A diagnostic scan tool can help determine if the CKP sensor is functioning correctly.
Distributor issues: If your 4Runner is equipped with a distributor, problems with the distributor cap, rotor, or internal components can cause a no-spark condition. Inspect these components for signs of damage or wear.
Faulty ignition switch: The ignition switch is responsible for supplying power to the ignition system. A faulty ignition switch can disrupt the electrical connection and result in a lack of spark. Check for any signs of a loose, damaged, or worn-out ignition switch.
Wiring and connections: Inspect the wiring harnesses and connections related to the ignition system for any damage, loose connections, or corrosion. Faulty wiring or connections can disrupt the flow of electricity and prevent spark generation.
It's worth mentioning that the presence of fuel on the spark plug may not necessarily indicate a lack of spark. It could be due to other issues, such as a fuel delivery problem.
Please check out this guide as well.
https://www.2carpros.com/articles/car-not-running-advanced
Please go over this guide and get back to us.
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Tuesday, February 19th, 2013 AT 11:00 PM