Hi all, I,ve got an 03 Punto 1.2 8v which keeps failing me. I had the head gasket done 6 months ago then the clutch went last month and also need a new gearbox and a front section of exhaust. After all this ran fine for 2 weeks then ecu light came on and the mpg took a dive from around 38 to 20mpg. The exhaust gas smell sooty and I get black marks on the floor where I've run it. It also misfires under load above 3000 rpm. It starts hot or cold no problem but when cold I can drive about 100m then when I try to pull away from junction it just bogs down. If I dip my clutch and rev it will pick up but it takes a minute or two of running to get over this.
The plug leads were replaced with head gasket, I've just done the plugs, cleaned the sensors and throttle body as detailed in a few posts here. I checked the coil by removing leads from each side in turn and engine still runs. I got a lead and it showed the ecu light was on for "P0170 an oxygen sensor signal was weak the fault cleared but was logged ".
I'm thinking its a sensor but which one, can anyone help please!
Just to update I cleared all the faults yesterday and I've just been back to the car with Fiatecuscan and the same code has come up again it also mentions "Bank 1" on the fault title incase this helps narrow things down and it is running lumpy all the time now not just cold or underload.
The plug leads were replaced with head gasket, I've just done the plugs, cleaned the sensors and throttle body as detailed in a few posts here. I checked the coil by removing leads from each side in turn and engine still runs. I got a lead and it showed the ecu light was on for "P0170 an oxygen sensor signal was weak the fault cleared but was logged ".
I'm thinking its a sensor but which one, can anyone help please!
Just to update I cleared all the faults yesterday and I've just been back to the car with Fiatecuscan and the same code has come up again it also mentions "Bank 1" on the fault title incase this helps narrow things down and it is running lumpy all the time now not just cold or underload.
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