Quote:
Originally Posted by Colt Hero
BTW, I've never cleaned injectors in my life. I think that problem is as rare as a $2 bill...
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$2 bills are actually quite common, most banks have lots that you can get if you want them, it's just nobody wants them. And I have seen many fuel injectors that needed cleaning. Usually only if low quality fuels are used, but I wouldn't rule that out just because only high quality fuel has been used.
Find a shop that uses BG products and have them do an induction flush on your engine. I have seen on many of the newer 3.8l engines that carbon builds up all through the intake and on the valves and causes misfires. The biggest cause of the cat going bad in these is the engine not running at 14.7:1 AF due to the carbon buildup absorbing the fuel and releasing it at a steady rate (runs rich on decel and lean on accel). I have done an induction flush on two of these that had the P0420 code (cat inefficiency), it actually fixed them both. It's expensive, but it's good stuff. Certainly not a gauranteed fix, but given what you've repalced, that's what I'd try next if the fuel pressure checks out good.