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Old 03-28-2010, 12:48 PM
richarddhoward richarddhoward is offline
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Default Re: running much too rich.chasing problem all the way to the PCM

You need to diagnose the misfire on Cyl #5. That will clear up the rich code I almost guarantee. Probably a wire, bad coil or a plug that's screwed. If it's not firing on that cylinder it means you will be putting to much fuel through the engine, on top of that it will make your PCM try and adjust the fuel mixture in the other cylinders to keep idle stable.
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