hello guys....
i really need help!!
i bought 200HONDAcivic CX 10 days ago..
and my honda goes 210-220 mile with per tank / full gas..
it s absolutly bad..

i asked to exOwner,

and he said

"" this car doesnt have .ecu..
you have to buy a .ecu. for his car..and it will go 300 miles at least..but now (without _ecu_) it spends more gas..""

and i went a serviceman..and he checked my car..

and he said,

"everything is normal..if your car doesnt have _ecu_ , transmisson doesnt work, check engine light gives signal etc..your car has _ecu_..your problem is not about _ecu_""

i really wonder..

DOES wrong_ecu_ cause to spend a lot of gas? or without _ecu_?

why my car spend more gas than normal cars??

if i bought a new or used .ecu. , will my honda be normal??

i cant ask question people who around me, that's why,
my english skills not good ..
and i am really confused..


PLEASE HELP ME
THANKSS

 

When you turn the key to ON (position II), does the check engine light on the dash turn ON for 2 seconds and then turn OFF or does it instead remain ON?

 

when i turn my key position 2, check engine lights on, and then turn off..just 2 second..
everything is normal about check engine signal..

 

What is your exact calculated gas mileage (i.e., miles driven/gallons used)?

I don't think you have an ECU incompatibility issue. Don't use that mechanic anymore. Start by replacing the spark plugs, spark plug wires, distributor cap, rotor, and air filter (=basic tune up). When was your last oil change?

 

ok..my exact calculated gas mileage is 90-100 mile per half tank ( it s about 5,5 galon)...

if i change air filter, fuel filter , how much percent do i see difference??
i went the other mechanic today,
to change air/fuel filter 's price is 58$..is it good or not?? can i make it myself?

and mechanic said me,"the spark plugs, spark plug wires are really good"

if i use different ecu, it doesnt cause to spend a lot of gas, right?

thank you very much...

 

Your numbers suggest 16-18mpg -- that sucks for your Civic! However, you need to precisely calculate the gas mileage. When you next fill the gas tank, reset the tripmeter to zero. When you again fill the tank, note the mileage and volume of gas needed to fill the tank. Divide the miles by the gallons of gas used.

I don't trust your mechanic based on his/her comments about the ECU. Go to a more reputable mechanic, and get a second opinion.

When the gas mileage is low, think basic tune up. The fuel and air filter can wait.

 

If you had no ECU the car wouldn't run... I think maybe the previous owner meant it doesn't have the correct ECU.

First we need to find out if the engine is original. Because if the car doesn't have the right ECU, that would point to a possible engine swap.

Look under the hood of your car at the area in the circle on this picture and see what your engine code is. Report back to us.

 

Trust, wouldn't an ECU mismatch with either the engine or transmission likely throw a CEL?

 

In most circumstances.
The only way it won't (which is a possibility) is if the previous owner swapped in a D16Y8 and left the stock ECU (D16Y7) in.

 

Really though, I think the previous owner probably has no idea what they're talking about and/or was lying to you to sell the car and make up a fake explanation for the bad gas mileage.