Quote:
Originally Posted by J-Ri
Pull off the air intake and open the throttle valve by hand, take a look inside and if it's got lots of carbon buildup in there, start with an induction flush. At work I use a kit from BG products, works great. Unfortunately it requires a special tool, which means you need to take it to a shop for this. Carbon on the valves can cause both codes... it absorbs gas when you accelerate and makes it run lean (random misfire code), and then on decel it keeps releasing that gas making it run rich and plugging the cat (cat inefficiency code). It certainly isn't a guaranteed fix, but chances are it needs it anyway. Plus on a very dirty engine it can get you up to a 15% increase in gas mileage (or, rather, undo the 15% drop you got over time from the buildup). The good news is that there's about a 75% chance that the flush will burn off the carbon in the cat and get it at least to where it doesn't set the code anymore.
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I cleaned the throttle body with carb cleaner and sprayed the rest of the can in the throttle body while it ran....then I put 2 bottles of STP super concentrate with a tank of 92 octane gas and let it run out....still runs bad and gas milage sucks......