2004 Toyota Corolla Q&A
2004 Toyota Corolla Question: WHERE S THE GAS
I have had nothing but poor consumption of gas ranging from 6K to 15K per Liter. So how would I now if this is the problem as the on board computer says everything is ok. I only have 73000 K on the car. As I stated my mileage from one tank to the next is like a roller coaster. I think that this is the problem as under the old systems if the choke was to rich there went the gas. I hope you can tell me what else I should check for. This has been a problem since day one they kept tell it would improve. I have even been using the additive Ethos. Gotten worse. Thank You and God Bless You Paul Chevalier - Paul1941
Paul you car has what is called On Board Diagnostics 2 (OBD2). There is a 16 pin diagnostic plug under the driver's side of the dash. The figures I would like to see will be retrieved (using a scan tool looking at data stream) are the Short Term Fuel Trim and Long Term Fuel Trim. reads + 10% the computer on your car is adding fuel, if it reads -20% it is taking away fuel. You want to see Long Term Trim to be near zero. The Oxygen sensor is key to determining the efficiency of combustion and the air flow meter is a critical input and the coolant temperature switch are the three most important inputs. The government have a website showing gas mileage but the figures seem optimistic http://www.fueleconomy.gov/feg/findacar.htm I would say you need to get a second opinion as to what scan tool information readings actually means. Are you driving mostly very short trips or driving the car at speeds of 100km an hour for sustained periods of time?. - patrick mannion
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