Question about 1991 Honda Civic

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Engine Bogs with Service Engine Lights on

Can anyone tell me how to shut or turn service engine light off? I notice is making my car bogs everytime I accelerate the car at any speed, when it come to idle it want to stall and taking off from a dead stop it bogs and the car do not to accelerate because the service engine light is on. The only way I can get the light to turn off is turn the engine off completly and turn it back on; it seem to reset it self and it does not take long before the light come back on. the car run normal as long the service engine light stay off. I unplug the O2 sensor but it did nothing, any seggestion?

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  • Rob Sinbad
    Rob Sinbad Jun 16, 2009

    I have 1991 honda civic automatic..PGM FI 12 valves...One thing I also notice, The service engine light stay off as long the engine still running cold, as soon as it warm up or running at normal temperature the light come back on. so Im thinking it has to deal with temp. sensor to kick that light back on. I assumed there are more than one sensors hook up to that damn brain box. I don't think replacing the sensor will fix the problems even though when I unplug the O2 unit it should kick the light off, im going to replace it any how since it cheap to see if it work.

  • Rob Sinbad
    Rob Sinbad Jun 17, 2009

    Let just say is not an O2 sensor, but I will go ahead and replace it. This is what I don't understand, O2 sensor has one job, its tell the computer how lean the car is running but does not detect any temperature nor has any effects on how hot or cold the engine runs because is O2 sensor not a Temp. sensor; Of course if the O2 sensor is bad it will also trigger the light on any operating condition. The car run fine when is running Under Operating Temperature although when the car reach it Operating Temp. the light come back on, this issue has to deal with temperature in it self because is triggering the light when the engine reach normal operating temp; so what Im thinking is, there is a sensor has to deal with engine temperature in it self giving a fault reading due to a bad sensor. my question is, what others sensor might it be that would trigger this light beside O2 sensor if it not the problems. I know is not the timing, not the coil, no vacuum leaks, not a fuel pump nor is dirty fuel filter which all have been replace. sense the car has been sitting for 6 hours at work and the engine is cold, i can actually go out and start the car up run and drive it for awhile without a bit of problems until the engine temp get up operating temp than the light will kick on and than the problems begins.

  • Rob Sinbad
    Rob Sinbad Jun 18, 2009

    Im going to replace O2sensor today and hoping it work. I bought this cash car to run around in while rebuilding my 85' 911. The guy at used car lot told me its dependable until half way home; cant do much is an As Is car. I got to get this damn thing running soon, now i got my old lady on my *** complaining buying junk on top fiddling with this car which I shouldn't be doing but working on my 911. MAF is what i did thought and would be the next thing id would look into. I will keep you update after O2 sensor.

  • Rob Sinbad
    Rob Sinbad Jun 20, 2009

    after reading all the blogs from Honda tech forum its unbelievable now knowing it a common problems for 1998 to 2001 hondas; no one seem to know how to tackle the issue although so many have replace O2 sensors and some have spent 500 to 1000 buying and replacing parts and still not fixing the issue I had a feeling replacing O2 sensor will not work, its something else causing the the light to trigger when it reach operating temperature. I drove the car all day today trying to figure what causing the issue. Every time check engine light come on while Im driving car tend to blog down and run horrible. I notice every time light kick on while Im driving I would turn the ignition off completely & quickly and turn it back on which would fix and reset the ECU for a bit and the car will run fine for a few then the light would come back on. This car have got me puzzle.



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Your car needs O2 sensors and if one or any are unplugged your car will operate as you described(like ****). To get your check engine light off you need to find out what is triggering the check engine light sensor. It it most likely in need of an O2 sensor replacement. If you can tell me what kind of car you have I can give you more information.

Posted on Jun 16, 2009

  •  Ben S.
    Ben S. Jun 17, 2009

    Temperature is the #1 desstroyer of cars. You need to find out what is triggering your check engine light. Unplugging your O2sensor is a HORRIBLE IDEA. If your check engine light only goes on when the car is warmed up is even a bigger indicator that you have a failed O2 sensor. If you know how to short out your ecm and obtain engine code(s) you can find out what codes mean by looking them up in a repair manual(emissions section). I have dealt with many exaust problems involving O2 sensors. Replace your O2 sensor(s) and let me know how it goes. Will probably only cost you 20$ if you do it yourself.

  •  Ben S.
    Ben S. Jun 17, 2009

    O2 sensors or oxygen sensors detect the level of oxygen flowing into your intake. When they fail they tend to act normal at cold temperatures and act like their failing when warmed up. If not your O2 sensor it could be a MAP or MAFsensor. It seems to me like you would have a much easier time if you found out exactly what is triggering your check engine light. Some laces like AAMCO will read your check engine light for free. You should head my advise as this is what this website is for. I only want to help.



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