My car since I bought it has always run rich and I've changed both O2's, coil, plugs, wires..etc. I took the gutted cat off and put a ORP in its place a year ago and it just makes the bumper yellowish/brown and just smells like stinky exhaust. I didnt know if theres a way to lean it out, other than by putting my high flow cat back on, because I love the sound and feel, with the ORP, but I hate getting the smell of exhaust in my clothes and having to scrub the bumper every week. Anybody got tables to wear I could lean it out thru Tuner Cat?

 

I'm looking to do the same thing on my 1994 LT1 M6. Mine doesn't sound as rich as yours, but I have quite a bit of carbon inside my tailpipes and when I floor it in warm weather the car puffs black smoke sometimes under acceleration. O2's are reading around 930mv at WOT at almost all RPM ranges. I'm going to get dynoed this week and see what the 930mv ='s in AFR....then I can do more serious tuning from there.

I have started using tunercat to change idle, decrease fan turn on temp, disable CAGS, and fine tune my MAF readings to get the BLM's closer to 128 under normal closed loop operation. Now all that's left is figuring out which PE tables are the best to change for WOT tuning. I have been told there are two, one with ECT(Coolant temp) vs MAP and another is ECT vs RPM....the numbers in those tables are ratios (multipliers) so reducing the number should lean you out and vice versa.

Can anyone correct me on this assumption? I'm heading to the dyno this week and I'dl like to have a few different programs ready to fly for tuning rather than take time to tune at the shop on the clock.

 

I did a search for the rich problem and several posters said they raised the injectors size, therefore tricking the PCM into thinking the injectors are bigger and not dumping as much fuel. They said it worked great, but I didnt get a chance to try it yet. For your other question try posting in this forum, if you havent all ready http://www.mgfracing.com/tunercat/ .

 

its in the help menu under PE mode...it cosist of 2 tables