1999 WJ ECL/white smokes - JeepForum.com
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post #1 of 3 Old 08-15-2017, 11:42 AM Thread Starter
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Location: Washington, D.C
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1999 WJ ECL/white smokes

I own jeep for the first time. 1999 WJ limited with v8 4.7L engine. After a fun trip to beach (drove on the beach). The ECL came up on after 5 hours drive back to home. Rough idling and white smoke comes out of the exhaust. I tested the engine and got the code of P0303-misfire spark plug/ignition coil. I replaced all 8 spark plugs and ignition coil. The issues is still there. Is there any solution to have the engine back running smoothly. Advices would be helpful as I am highly motivated to fix my WJ as it is my first experience with jeep. Thanks!

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post #2 of 3 Old 08-20-2017, 09:15 PM
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2000 TJ Wrangler 
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In addition to ignition system issues, misfire codes can also be caused by faulty injectors -- you can try swapping the #3 injector with one from another cylinder to see if the problem follows the injector.

2000 TJ SE
2005 LJ Rubicon
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post #3 of 3 Old 08-21-2017, 04:38 PM
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1974 CJ6 
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White smoke is normally water intrusion into a cylinder. Have a compression leakdown test performed and see if there are bubbles in the radiator while pressure is on cyl #3. You can also have a test done on the radiator fluid to see if there are traces of combustion gas mixed in. Unfortunately white smoke normally points to head/head gasket issues.

80 CJ-5, 74 CJ-6, 56 CJ-5
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