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 -
Answer 1
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?. -
Comment 1
I am sorry that it has taken me this long to reply but there has been a lot going on with my mother. I think it has slowed up a little. Question where do I get the scan tool?? We have air care up here would that?? I would take it to the dealer but they never find anything and if they have they are not saying anything to me. But tell me everything is ok. I do want to thank You for the information. Its an A+. Thank You and God Bless You Paul -
Comment 2
We have a really expensive lap top based scan tool but there are cheaper one I like made by Equuis http://www.iequus.com/news/news.php?id=22 http://www.auto-facts.org/automotivescantoolreviews.html Kragen sell them and loads of websites on line sell them. If you have a Check Engine light come on having a scan tool to diagnose the code yourself may save you money in repairs if you are handy at doing your own work. -
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