2001 Jeep Cherokee Rough Run and EVAP Codes Fix

2001 JEEP CHEROKEE
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RSTEIN
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I keep getting the check engine light coming on after resetting and driving for about 2 or 3 days. Bought this jeep new, and wife drives it (not very far). The gas cap has been changed and I replaced the rear CCV hose to the manifold. I get codes P0442 and P0455. I do not smell gas under the hood? Wife says that jeep seems to burn more gas, and runs rough. Any thoughts?

Thanks for your assistance.
Dec 30, 2006 at 2:03 PM
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SERVICE WRITER
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It probably has a 4.0 motor?

The get a carbon build up that contibutes to your symptoms. HAve a professional fuel injection cleaning service done and also clean the thottle body and intake valves. The latter you can do, I'll explain if needed.

After these are done, periodically run the rpm up to 3500 in low gear to help break up the deposits for a mile or so.
Dec 30, 2006 at 2:14 PM
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Suggested Repair

Have a professional fuel-injection cleaning performed, and clean the throttle body and intake valves to remove carbon buildup. Afterward, periodically hold about 3500 rpm in low gear for a mile or so to help break up remaining deposits.

Conversation Summary

A 2001 Jeep Cherokee with about 37,000 miles repeatedly sets P0442 and P0455 after the check engine light is reset. The gas cap and rear CCV hose were already replaced; there is no fuel smell, but the Jeep uses more fuel and runs rough. The expert attributed the symptoms to carbon buildup on a likely 4.0 engine and recommended professional fuel-injection cleaning plus throttle body and intake valve cleaning, followed by occasional higher-rpm driving to break up deposits.

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