No Alfa Waves as
Join Date: Feb 2011
Location: United Kingdom
This post is of interest to me, I have a 2003 JTS and the MCSF light has been on twice with P0420 & P0430 error messages simultaneously - both within 1000 miles of each other, the first error messages were reset by Alfa, since then I've bought an ELM327 though I have failed to connect FiatECU to the car yet. I used the software supplied to read the codes.
I have pulled he plugs and they are very sooty. Which explains why the trip was reporting MPGs of between 36.5 and up to 41 regularly but a reality check showed it was never really did better than 32 MPG.
Where are these errors coming from, are they false due to the sooty plugs from running rich and what should I look for next? So far I've checked the coil packs' resistance and they all read similar values. How do I check the MAF - should I check that as it appears to be a fuel mixture issue?
The car misses a lot when cold and idling, the missing lessens when the car has warmed but not by much.
Any help appreciated!