Check engine light illuminates due to misfireswhen one or more of the spark plugs start to fail or has failed in your wrangler, it will cause the engine to misfire and the check engine light may illuminate in the instrume…
If your jeep tj has a hard start issue (extended cranking) after changing the spark plugs, especially when the engine is cold, it might not be the plugs themselves
A likely cause is a faulty check.
One of the most common symptoms of bad spark plugs is a hard start
If your engine struggles to turn over or takes several attempts to start, especially when the engine is cold, it could be.
Testing for spark can very easily and safely be done with a dedicated spark tester
If the ignition system is the cause of the cranks but does not start condition, you're not gonna' see spark at.
Through our comprehensive examination of the common causes of engine idling issues, including vacuum leaks, dirty throttle bodies, faulty idle air control valves, spark plug problems, and damaged.
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This video will show you a step by step process on how to change spark plugs on a jeep wrangler (jk) 3.6l