Question about 1993 Honda Accord

1 Answer

93 Accord Oxygen Sensor Confusion

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.

Thoughts?

Posted by on

  • stephen_krau Nov 18, 2008

    I did the ECU reset number and my highway RPMs went back to normal, which is strange according you what you said, because I did change the tires. The tires that came with it were 195/65/15 which apparently is the wrong size so when I got new ones I got the right size 195/60/15. Anyway, I haven't fueled up since so I have no idea if my MPG is back where is used to be.

    Problem is the "check engine" light still comes on after cold starts, and the same fix works to get the light to stay off (kill the engine start it back). I did notice however that when the light is on my idle speed is higher than normal, it basically hovers just above or just over 2k RPMs... any clue as to what's going on?


×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Honda Master
  • 331 Answers

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)
93 Accord Oxygen Sensor Confusion - 65a6b8a.jpg d43f356.jpg


Posted on Nov 15, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
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.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I want to replace the oxygen sensor in my 1993 honda accord ex, where is this located and does it need special tools


it is located at the exhaust pipe before the catalyt converter. No special tool required, normal spanner will do, make sure the exhaust pipe is not hot...disconnect the electrical cable connected to the sensor first. Spray WD 40 or lubrication to the thread before unscrew the sensor.

Jun 04, 2010 | 1993 Honda Accord

1 Answer

Recently my 93 accord ex cranks on and turns off right away after a while it will turn on just fine what can this be??


the car is not recognising the key and is actuating the ignition cutoff (it starts then stops running straight away)try the spare key,if thats okay then you need to get the car/keys recoded as sometimes they do lose the ability to be recognised.

May 06, 2010 | 1993 Honda Accord

2 Answers

Where is the oxygen sensor located in a 1991 honda accord


1991 Honda Accord 2.2L FI 4cyl
The Oxygen Sensor is located under hood, driver side, rear engine area, below exhaust manifold flange, mounted in exhaust pipe.
Application: EX model

Good luck.

Mar 16, 2010 | 1991 Honda Accord

1 Answer

Failed emission NOx on a 93 Honda accord ex its papes the 25/25 test but not the 50/50 test. what is wrong how do I fix this? check engine light stays on?


The only thing I can think of checking would be the EGR valve, a faulty cat converter or faulty o2 sensor. Converter shouldn't set off check engine light though unless it is clogged causing too much back pressure, most likely EGR Valve.

Oct 01, 2009 | 1993 Honda Accord

1 Answer

1993 honda accord ex won't pass smog check. what


bad o2 sensor or clogged catalytic converter, several items

Sep 24, 2009 | 1993 Honda Accord

1 Answer

Replaced speed sensor on 93 honda accord and speed odometer


it's only a couple of things that could be wrong. if you already replaced to speed sensor make sure you have power and the connector. but it's prob you gauge

Sep 03, 2009 | 1993 Honda Accord

1 Answer

Accord transmition


it is the speed sensor I have a 93 that does the same thing

Dec 29, 2008 | 1993 Honda Accord

4 Answers

Rear speaker size in my 1993 Honda Accord


I HAVE A 93 ACCORD LX AND ACCORDING TO HONDA MINDS COME WITH 6.5" SPEAKERS FOR THE BACK AND TO GET 6X9 IN YOUR GOING TO EITHER GET THE SPACER THE COME WITH THE EX OR YOU OR GOING TO HAVE TO CUT AND THEY DONT RECOMMAND IT CAUSE YOUR TRUNK WONT STAY OPEN AND YOUR GOING TO HAVE TO BEND THE BAR UNDER THE TRUNK. HOPE YHIS WAS HELPFUL.

Dec 16, 2008 | 1993 Honda Accord

Not finding what you are looking for?
1993 Honda Accord Logo

697 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

yadayada
yadayada

Level 3 Expert

68032 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22011 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6817 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...