What should a 4.0 Jeep idle?

Jerricho said: Most cars should idle around 650. The allowable RPM range for emissions testing at idle here is 450-1100, so you are basically at the absolute bottom of that range. Bump it up a bit, mine really likes to idle at about 600. via

Would a vacuum leak cause high idle?

On a fuel injected motor, a vacuum leak can cause the engine's RPM at idle to increase. In fact, it's possible to double the idle speed if the leak is significant enough. When a vacuum leak is detected, the O2 sensors on the engine will detect extra oxygen is entering the intake manifold. via

What does idle air control system RPM lower than expected?

Diagnostic Trouble Code (DTC) P0506 stands for “Idle Air Control System RPM Lower than Expected.” It means that your powertrain control module (PCM) has detected an engine idle speed lower than the specified revolution per minute (RPM) for a specific amount of time. via

Can I drive with P0507?

Diagnosis: This trouble code will not prevent your vehicle from driving, but you may experience engine stalling, high idle rpm, harsh engagement of transmission, difficulty starting, and/or surging idle. via

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