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fuel filter/code 43 relation?

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    #1

    fuel filter/code 43 relation?

    so.. i got a code 43 in my 93 ex after bogging down and cutting out on the interstate. whenever i rev over 4000rpm, it clears up and i regain power.

    i replaced my oxygen sensor with a NGK sensor... it ran fine for about 2 or 3 days and then it's doing the same thing. however, i'm not throwing any codes. she's got about 220,000 on the clock... i have no idea when the fuel filter was replaced considering i just bought it back in january. would a fuel filter be the culprit? sometimes it stutters and bogs, sometimes it doesn't. i'm confused.

    it's a 93 ex 5spd btw... all stock
    90 LX coupe 5spd
    135k, bone stock
    Tags: None
    #2
    id change the fuel filter out just because it is always neglected. the code isnt related to a fuel filter but since it doesnt come on any more it may not be devastating enough to set a CEL but still cause driveability. does it still run fine above 4k rpms? what you are doing is putting it into open loop and that does not see a O2 reading.

    brand new ngk unit? tried unplugging a battery cable or pulling the ecu fuse? erase adaptives.
    I <3 G60.

    0.5mm Oversized Stainless valves and bronze guides available. Pm me please.

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      #3
      yea i would change the fuel filter too before anything i replace mines not to long ago and it was nasty did justice tho after

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        #4
        Originally posted by wed3k View Post
        id change the fuel filter out just because it is always neglected. the code isnt related to a fuel filter but since it doesnt come on any more it may not be devastating enough to set a CEL but still cause driveability. does it still run fine above 4k rpms? what you are doing is putting it into open loop and that does not see a O2 reading.

        brand new ngk unit? tried unplugging a battery cable or pulling the ecu fuse? erase adaptives.
        yeah, when it starts cutting out, i can downshift and go over 4k and i regain all power. though yesterday, i drove up the interstate for 70 miles just to see if it would start the same crap again, but it drove like it was brand new. so i'm perplexed. i did reset the ECU (pulling the under hood hazards fuse, yes?) for about 10 min and plugging it back in. also unhooked the neg cable for the same time.
        90 LX coupe 5spd
        135k, bone stock

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          #5
          driving today, it started cutting out again... after about a minute of it, this time, since the new sensor, i finally threw a CEL code. i'm getting code 41 now.

          this is a brand new NGK sensor i've replaced it with. the bosch did the same thing, this is why i bought NGK. what should i do now?
          90 LX coupe 5spd
          135k, bone stock

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            #6
            The fuse you pull to reset the ecu should be the radio/backup fuse under the hood.
            PT3/6 Development Thread | My 1991 LX Coupe | DIY: 90-93 Tcu Fix

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              #7
              code 41 indicates a problem with the 02 heater circuit. I would start with a continuity check. Check continuity from body ground and each terminal of the sensor. If you have continuity on any terminal, then you have a bad 02. Then check the yellow/black for B+ voltage, and orange black for ground, and any shorts to B+ or ground. Could possibly be the main relay or the worst case, ECU.

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