Somebody put popcorn kernels in my new Cat...
Here'* the story....
(For reference my car'* a '96 Bonnie SSEi)
My Catalytic Converter had been on the fritz for a while, gradually getting louder and louder, and I just got it fixed three days ago. My car is running quieter than it did when I got it 2 years ago, and for an hour or two it even seemed a good deal faster 0-40MPH, but that night it started backfiring a little bit under heavy load, and since then its been backfiring like crazy under load (3K RPMs or higher in most gears). It loses a little power when it backfires but it doesn't really surge much, and it doesn't backfire as much at higher speeds. It also sporadically stops BF'ing at 70MPH with WOT.
I tried resetting the PCM today (disconnected both batt. terminals for 1/2 hour), and it didn't make a difference in the backfire, but i'm not sure if it even reset the computer 'cause it'* still running the same as before to a tee. I'm about to put in the new PCV that i've had sitting around for a month at least, but I doubt that'll do much.
My questions for you guys:
1. How do you properly reset the ECU? I saw something in a post somewhere in my extensive searching that said something about pulling two fuses, but i'm not even sure now if that was for an L67.
2. Any ideas on why it might be backfiring? The cat was split down the side and a good deal of the exhaust was coming out right there, so could the 02 sensor have been sending screwy signals? It smelled like it was running really rich all the time, and my mileage seemed to worsen when the cat was screwed up, but I could be mistaken.
3. How many 02 sensors does the L67 have? I can see the one on the exhaust manifold right before the DP, but is there another after the cat?
Any help/advice/etc... is greatly appreciated.