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Code P0430

This is a discussion on Code P0430 within the Engine & Performance forums, part of the Ford Expedition Forum category!
I went to Autozone because my CEl came on and I got code P0430 this is a bad O2 or ...

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Old 04-17-2008, 06:24 PM   #1 (permalink)
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Default Code P0430

I went to Autozone because my CEl came on and I got code P0430 this is a bad O2 or CAT CAUSED by misfire or vacuum leak or exhaust leak. I have pretty much ruled out Vacuum and exhaust leak which leaves me with the misfire I have been having.Can anyone tell me how to determine which cylinder is misfiring??? I have pulled every single one of the boots to do a visual inspection looking for water or oil in the well but they were all clean and dry. I am only getting the misfire at about 2000 RPM's when I accelerate and sometimes on the highway at around 72 MPH consistantly. I replaced the TPS about a month ago because the truck was losing power and bogging down when I stepped on the gas this fixed that problem but now I have this problem.
I don't want to chase my tail on this and was wondering if anyone can give me some advice
This is'nt a bad misfire yet it is just a slight bucking when I accelerate but I am worried it will get worse.
I am moving next month and need to fix this before I have to drive 4000 miles across country.
thanks in advance for any help.

2003 Expedition 4.6L XLT
71,000 miles
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Old 04-18-2008, 06:54 AM   #2 (permalink)
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has it ever had plugs ??
2012 F150 Ecoboost crewcab
pearl white
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Old 04-19-2008, 11:19 AM   #3 (permalink)
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id put some plugs in her if the havent been done and that should take care of it unless u have a bad coil but start with the plugs
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