Question about 1993 Honda Accord
I recently replaced the Oxygen Sensor on my 1993 Honda Accord EX, and ever since doing so two funny things have happened. The first is that my check engine light is illuminated occasionally when I start the car from completely cold (i.e. starting after sitting 3+ hours). If I turn my engine off and then immediately start it back up the light does not come back on. Second, my gas mileage has gotten WORSE since the change. I've noticed a loss of 2-4 mpg over extended trips and that my RPMs are higher than they were before the switch. For example, I used to run about 2,600-2,800 RPMs going about 60 MPH depending on driving conditions and since the switch the RPMs are rarely lower than 2,900 at 60 MPH.
My obvious concern is that I've only ever heard of a new oxygen sensor fixing an illuminated check engine light, and that mileage always improves once the sensor is replaced. I'm seeing exactly the opposite.
Did you reset the ECU after changing the sensor? If not you need to (procedure in 2nd pic below), that way the fuel trims are reset and the ECU can re-learn the Short term and Long term fuel trims. this could be the cause of the difference in MPGs.
An O2 sensor will have no effect on RPMs/MPH. the only thing i can think of that would effect this besides changing gear ratios, would be changing the overall diameter of your tires or possibly a slipping clutch.
Check the codes on the ECU. here is the procedure:
(CLICK PICTURES FOR FULL SIZE)
Posted on Nov 15, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jun 04, 2010 | 1993 Honda Accord
May 20, 2010 | 1993 Honda Accord
May 06, 2010 | 1993 Honda Accord
Mar 16, 2010 | 1991 Honda Accord
Mar 06, 2010 | 1993 Honda Accord
Oct 01, 2009 | 1993 Honda Accord
Sep 24, 2009 | 1993 Honda Accord
Sep 03, 2009 | 1993 Honda Accord
Dec 16, 2008 | 1993 Honda Accord
755 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: