Thanks for that, you've been a great help!!
Checked under the bonnet on Monday night, and:
-cleaned the MAF Sensor with some contact cleaner as recommended in other posts (it wasn't actually that dirty, but got some soot off it and made it nice and shiny!)
-Checked the air filter wasn't clogged - looked fairly new. Couple of leaves in there so removed those!
- Had a look at the O2 sensors and checked that they were connected the right way round.... now this is the interesting part! As i pulled the wires out from hiding behind a pipe they weren't actaully connected to any connector (Black or grey)!!!!
Now I can only presume that the garage who fitted the new Cat didn't bother to put these back... which was nice of them!
I connected them up, as you suggested (Sensor 1&4 to black, 2&3 to grey), reset the ECU by leaving the battery disconnected for over 10 mins and put everything back to how it was before.
I took it for a quick spin, and at first I was a little dissapointed - still spluttering/misfiring in low gears and not how I would have hoped. Anyway, took the car to Shell the next day and filled up with Optimax and been driving it around for the past few days and WHAT A HUGE DIFFERENCE!!
Really nice to drive, especially when using the Tiptronic to keep the revs around the 4-5K mark! :winky:
Still not 100% happy...
- The car's hit a sort of "dead spot" when in first gear a couple of times. Foot flat down and revs don't want to pick up (engine still revving loudly) - I have to ease of the accellerator and force it to drop into 2nd gear to get moving. The engine was warm at the time.
I will see how this pans out over the next couple of weeks, keep using decent fuel and maybe change plugs/coils?? Any recommendations for what sort to get and where to get them from?
- Still not overly impressed with top end speed. Pulls nicely through the gears, upto 80-90mph and then seems to struggle to reach the rev limit in 4th gear. It does not want to rev out in 4th and drop into 5th for some reason. If the road is VERY long and empty I have managed to get it to drop into 5th and got to about 110-115mph (but that was down hill with a strong wind behind me!)
I'm not sure if this is common with RS200 Autos? Is there anything that can be done to improve this (with compromising the lower end performance)?
I'll get round to taking some pics sometime soon! But for now i'm a much happier tezza driver
Gavin