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#1
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91 accord code 43
I have a 91 accord with 205k miles on it. Recently, it has been running
kind rough during acceleration and after a little while, the check engine light will come on and then the car runs just fine. It is throwing a code 43. I have used some fuel injection system treatment in the gas, and had a tune up with new plugs, wires, pcv valve, air filter, and fuel filter (all honda parts). I have been searching old threads in this group, but haven't been able to find any where the car was running bad until the check engine light comes on, and then runs good. When I am accelerating, it just doesn't seem to want to go, and it also has a very rough idle (until the light comes on) and sometimes it is so bad that I have to keep my foot on the gas a little to keep the car from going dead. Anybody know, or have any idea, what could be wrong? I was thinking it might be an O2 sensor, but I would like to know more before I shell out $300+ for a new one. Thanks! |
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#2
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91 accord code 43
That the symptoms go away after the CEL and code come up is
a little odd. I wonder if the ECU cuts out the oxygen sensor signal at this point, so the car seems to run better after the code comes up. Otherwise, given the symptoms (including Code 43), I would strongly consider replacing the oxygen sensor, especially if it's the original. IIRC correctly, some folks have helped quickly confirm a failing O2 sensor (on older cars like yours without allegedly more sophisticated onboard diagnostics) by disconnecting its electrical lead and observing how the car runs. Which engine does your Accord have? At https://www.automedicsupply.com/ , for the F22A1 engine, you can get an OEM O2 sensor for about $90. For the other 91 Accord engines, about $130. I have used this online site and service is excellent. Haven't found better prices for OEM sensors. http://www.pelicanparts.com/BMW/tech...gen_sensor.htm has some good discussion. New OEM distributor cap and rotor, and timing check, are a good idea, too. > wrote >I have a 91 accord with 205k miles on it. Recently, it has >been running > kind rough during acceleration and after a little while, > the check > engine light will come on and then the car runs just fine. > It is > throwing a code 43. I have used some fuel injection system > treatment in > the gas, and had a tune up with new plugs, wires, pcv > valve, air > filter, and fuel filter (all honda parts). > > I have been searching old threads in this group, but > haven't been able > to find any where the car was running bad until the check > engine light > comes on, and then runs good. When I am accelerating, it > just doesn't > seem to want to go, and it also has a very rough idle > (until the light > comes on) and sometimes it is so bad that I have to keep > my foot on the > gas a little to keep the car from going dead. > > Anybody know, or have any idea, what could be wrong? I was > thinking it > might be an O2 sensor, but I would like to know more > before I shell out > $300+ for a new one. |
#3
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91 accord code 43
Elle wrote:
I would > strongly consider replacing the oxygen sensor, especially if > it's the original. IIRC correctly, some folks have helped > quickly confirm a failing O2 sensor (on older cars like > yours without allegedly more sophisticated onboard > diagnostics) by disconnecting its electrical lead and > observing how the car runs. ------------------------------ Crappy signal versus NO signal will make a big difference. It's not a very valid test because the computer KNOWS when it's sensor has been unplugged. I'm toying around with some of this stuff right now on a '00 CR-V right now.. 'Curly' |
#4
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91 accord code 43
"'Curly Q. Links'" > wrote
> Elle wrote: > > I would >> strongly consider replacing the oxygen sensor, especially >> if >> it's the original. IIRC correctly, some folks have helped >> quickly confirm a failing O2 sensor (on older cars like >> yours without allegedly more sophisticated onboard >> diagnostics) by disconnecting its electrical lead and >> observing how the car runs. > > ------------------------------ > > Crappy signal versus NO signal will make a big difference. > It's not a > very valid test because the computer KNOWS when it's > sensor has been > unplugged. I'm toying around with some of this stuff right > now on a '00 > CR-V right now.. I believe you. Just thought I'd seen someone say they had a rough running car and when they unplugged the oxygen sensor, things settled down, assisting with a decision to replace the sensor. Presumably this was at idle, 'cause for the reasons you gave, and knowing the function of the sensor, I'd expect the computer to be all messed up without the O2 sensor input signal. But I don't have any substantial documentation for this little test. The net on the other hand has plenty of resources that describe more sophisticated generic and specific (to one's particular car model) tests for an O2 sensor. |
#5
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91 accord code 43
"'Curly Q. Links'" > wrote in
: > Elle wrote: > > I would >> strongly consider replacing the oxygen sensor, especially if >> it's the original. IIRC correctly, some folks have helped >> quickly confirm a failing O2 sensor (on older cars like >> yours without allegedly more sophisticated onboard >> diagnostics) by disconnecting its electrical lead and >> observing how the car runs. > > ------------------------------ > > Crappy signal versus NO signal will make a big difference. It's not a > very valid test because the computer KNOWS when it's sensor has been > unplugged. If the sensor is unavailable for *any* reason, the system will go into open loop, so unplugging it will be a good initial test. As far as I know, the '91 system is in open loop under the following conditions: * Idle (at any time) * Below full operating temperature * Full throttle -- TeGGeR® The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
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