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Re: I Flunked-MD Emissions
Posted by JohnK (more from JohnK) on Thu, 11 Oct 2001 16:34:12
In Reply to: I Flunked-MD Emissions, KevinD, Tue, 9 Oct 2001 20:34:51
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Most likely the cat...and you might be running a little lean. If your failure was borderline, I'd set your timing to 14 btdc or maybe even 13, throw in a bottle of techron injector cleaner, make sure cat is fully warmed up and you might sneak by. then reset to 16 and drive until next inspection. It could be your AMM but i would not replace it if you haven't experienced any of the stages of AMM aging: first, uneven acceleration and minor surging, second wide idle swings at start up, third backfires, major coughing, and clouds of smoke. A new O2 sensor might help, but yours is probably fine as others have noted. It is clearly bad if you don't get an ever so slight warm idle variation i.e. about the thickness of the tach needle.
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