DIY Guides › No Start
The CPS is a common cause of crank-no-start, especially intermittent failures.
When to use this guide: It cranks but you cannot confirm spark, or it dies randomly and restarts later.
The Crank Position Sensor is probably the single most common no-start cause on the 4.0L. It fails without warning, rarely sets a code, and is especially prone to dying when the engine is hot. If your XJ cranks fine but won't fire, and especially if it works again after sitting, check the CPS before anything else. Keep a spare in the glove box.
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