How many miles should the three-way cats on an Alfa Quadrifoglio last? I'm at 29k and the startup and idle has gotten progressively rougher. I did a remote start today and saw a puff of sooty exhaust on the initial startup, and a gasoline smell. I know this car has a "feature" where, to warm up the cats at startup, it burns a very rich mixture for a few seconds, but I wonder if this could also be fouling the cats faster than we'd like if that extra gasoline isn't burning like it should.
I wonder how can you check whether the cats are clogged using OBD-II on one of these cars? I can see their temperature ranging from 870–1050° in some OBD-II logs, which seems like a normal range.
I read somewhere that the post-cat O2 sensor voltage should be flat, but I'm not sure if that only applies when idling or also when driving. (It's flat when idling, but pretty consistent with the pre-cat O2 sensor when driving).
Thanks for any input, I do plan to take it to the dealership for a look but like to get as much information as possible first.
Note: the car does use three-way cats, and as far as I'm aware the oil has always been OEM-spec ACEA C3 oil.
I wonder how can you check whether the cats are clogged using OBD-II on one of these cars? I can see their temperature ranging from 870–1050° in some OBD-II logs, which seems like a normal range.
I read somewhere that the post-cat O2 sensor voltage should be flat, but I'm not sure if that only applies when idling or also when driving. (It's flat when idling, but pretty consistent with the pre-cat O2 sensor when driving).
Thanks for any input, I do plan to take it to the dealership for a look but like to get as much information as possible first.
Note: the car does use three-way cats, and as far as I'm aware the oil has always been OEM-spec ACEA C3 oil.