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If BOTH 02 sensors were bad for a long enough period of time, you could have carbon/soot build up everywhere. Valves, exhaust maifold, clogged cats...etc..etc..etc..

Start running "premium" gasoline for the next few fillups, and also try to bring the engine all the way up to redline. This will start to eat up/blow out the carbon build up.

Pull your spark plugs. Clean them off with a wire brush, or just replace them with new Copper plugs. The plugs are probably fouled with carbon.

That should help you. If the above does not, your cat/cats may be clogged and need to be replaced.


<hr width=60% noshade size=1 align=left>quote from 4DoorGL: "Told you. Random is cool as hell in person, even if he is a dick on the net <img src=/images/forums/snitz/wink.gif width=15 height=15 border=0> (j/k)"

Leave it to Random to Needlessly complicate things.
 

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If the cat(s) were just minorly clogged, it would create exessive backpressure. That would rob you of HP and mileage, but not throw a CEL, as it would still allow the cats to function.

There are several brands of "cataylitic converter cleaner" on the market. You MIGHT want to consider giving one a shot. That would be much cheaper than outright cat replacement.

Lastly...I can't see where you live, but if you live where they change the "winter gas" to an oxgenated gas, that can cause the decrease in mileage, and it can also cover up a failed cat. Once your gas pumps go back to "summer gas" your CEL might come back on, to indicate your cat(s) as bad.


<hr width=60% noshade size=1 align=left>quote from 4DoorGL: "Told you. Random is cool as hell in person, even if he is a dick on the net <img src=/images/forums/snitz/wink.gif width=15 height=15 border=0> (j/k)"

Leave it to Random to Needlessly complicate things.
 

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It would be in the "gas additives" aisle. (Octane boost, fuel injector cleaner...etc.etc.)

It should be labed as "Cat converter deoderizer" or "Cat converter cleaner".


<hr width=60% noshade size=1 align=left>quote from 4DoorGL: "Told you. Random is cool as hell in person, even if he is a dick on the net <img src=/images/forums/snitz/wink.gif width=15 height=15 border=0> (j/k)"

Leave it to Random to Needlessly complicate things.
 
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