b18a1 civic still running rich, code 43
#1
b18a1 civic still running rich, code 43
ok, so i bought a 88 civic with a b18a1 motor in it. its been running rich since day one and has also been showing code 43. ive replaced air filter, o2 sensor, spark plugs, fuel filter. and it runs a little better but still rich and showing code. i've recently found out from the previous owner(who also doesnt know much about cars) that he had a mugen chip in the ecu. could this be the thing that is causing the car to run rich? also i only get about 225 miles on a full tank of gas. i've done a lot of googling and probably read about 10 threads on this subject but dunno which direction to take. any help would be appreciated. thanks!
#3
Re: b18a1 civic still running rich, code 43
is it possible to just remove the mugen chip? and my car doest run right unless the dizzy is advanced all the way, is the chip also causing this?
#5
Honda-Tech Member
Re: b18a1 civic still running rich, code 43
Code 43 is only thrown by OBD1 ECUs, and is exclusive to the Civic/Del Sol/Accord/Prelude platforms, Integra ECU throwing code 43 even being OBD1 would theoretically be impossible.
you sure its not code #4 and code #3?
#3= Map sensor
#4=ckp
To me,it sounds like it is a possiblilty of it being the ecu.does it rev up slowly and run like Sh$t?
Id also try making sure your tps is adjusted correctly,and remove and clean the iacv.also,unplug 02 sensor and see if code(s) go away.
you sure its not code #4 and code #3?
#3= Map sensor
#4=ckp
To me,it sounds like it is a possiblilty of it being the ecu.does it rev up slowly and run like Sh$t?
Id also try making sure your tps is adjusted correctly,and remove and clean the iacv.also,unplug 02 sensor and see if code(s) go away.
#6
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Join Date: Sep 2007
Location: portland, Or, USA
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Re: b18a1 civic still running rich, code 43
I had a b18a running the 91 si ecu ran fine no codes, switched to a 91 integra ecu and
got code 43 obd0 ecu. Changed the o2 and the code went away.
got code 43 obd0 ecu. Changed the o2 and the code went away.
#7
Re: b18a1 civic still running rich, code 43
Code 43 is only thrown by OBD1 ECUs, and is exclusive to the Civic/Del Sol/Accord/Prelude platforms, Integra ECU throwing code 43 even being OBD1 would theoretically be impossible.
you sure its not code #4 and code #3?
#3= Map sensor
#4=ckp
To me,it sounds like it is a possiblilty of it being the ecu.does it rev up slowly and run like Sh$t?
Id also try making sure your tps is adjusted correctly,and remove and clean the iacv.also,unplug 02 sensor and see if code(s) go away.
you sure its not code #4 and code #3?
#3= Map sensor
#4=ckp
To me,it sounds like it is a possiblilty of it being the ecu.does it rev up slowly and run like Sh$t?
Id also try making sure your tps is adjusted correctly,and remove and clean the iacv.also,unplug 02 sensor and see if code(s) go away.
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#9
Re: b18a1 civic still running rich, code 43
ok so got a stock obd0 pr4 and its running a little better still showing code 43. maybe the"mugen" chip messed up the new o2? or maybe fuel injectors?
#11
Re: b18a1 civic still running rich, code 43
got new fuel pressurr regulator. checked vaccumm lines..running a little leaner. STILL have code 43. bout to give up. maybe fuel injectors or bad wiring? will spark plugs and/or spark plug wires cause code 43?
#13
Re: b18a1 civic still running rich, code 43
check all 4 injectors if there clicking
get a long screw driver or a long rachet extension put it in the injectot the other on your ears.
should be getting continous clicking
get a long screw driver or a long rachet extension put it in the injectot the other on your ears.
should be getting continous clicking