I only seem to post here when I have a problem, but trust me, I read alfaowner quite often. People here helped me once before, when I still had my 146 Boxer, so I'm not afraid of asking for help again.
I bought my second Boxer Alfa, this time it's a 145 with a 1.4, with 119.000 km on the clock.
The fuel economy on this one is simply AWFUL. On a combined cycle, it uses up to 13 L for every 100 km, and urban consumption gets close to 20 L/100 km.
On ignition, a VERY rich petrol smell can be sensed in and around the car, especially on cold starts. Also, the cold starts bring another headache. After ignition, revs normally shoot up to 1500 rpm. They stay there for 10-15 seconds and then drop to 1000 rpm, where the real problems begin. It idles poorly, it drops to 500 rpm, then shoots up to 1500, then drops again, and so on until the temp. needle lifts of the 40 degrees mark.
I think I diagnosed the idling problem in a dirty throttle body which I plan to clean up during the weekend. As I'm listening, I can hear the engine struggles for air, so cleaning the TB may be the solution.
The car is de-catted if that helps.
I've read countless topics about lambda probes and fuel economy, and I've read that disconnecting the lambda itself can improve bad economy. Also, I've read that a de-cat can ruin the fuel economy, and that an ECU reset can cure that. What do you guys think?
I'm planning on changing the probe, but that'll take months until it arrives, as I plan to order it online.
Any help and tips would be greatly appreciated.
P.S. Excuse my bad and overly complicated English, I'm from Macedonia, if you ever heard of us