43 - Fuel Supply System defective or malfunctioning fuel supply system

does this mean the civic fuel pump is not enough for the GSR motor?

 

not sure but it could be your gas cap.. take it off and put it back on again making sure it makes 3 clicks.. this

 

your pump may be bad, code 43 has nothign to do with the gas cap. lol

 

Well, on my NSX (OBD-1), code 42 is rear fuel supply system, and code 43 is front fuel supply system. According to my mechanic, it's almost always an O2 sensor (on all Honda/Acura). When my NSX threw a code 42, replacing the rear O2 sensor fixed it right up. My NSX is now currently throwing code 43 and code 01 (front fuel supply, and front O2 sensor).

I'd go for the new O2 sensor. I'm pretty sure it'd fix your problem, and you'll probably get better mileage if it does. When I replaced the bad rear O2 sensor, my mileage improved from about 18mpg to about 22mpg.

If your car is OBD2, I'm not sure what to tell you, as I don't know which O2 sensor it would be.

Lastly, if you have a factory service manual, there SHOULD be debugging info for that code.

-Mike

 

thanks for the info.. my setup is ODB1, so maybe it is the o2 sensor.. the code usually pops up when i'm just cruising at constant rpm and partial throttle...

 

Exactly the same conditions under which my car throws the code. More prone to happening up hill, as well (doesn't often happen on flat ground, I think it's because my engine has enough torque that I can't keep a constant speed while still maintaining a medium throttle setting).

I'd definitely do the O2 sensor.

-Mike

 

Me too. I replaced all of the fuel system components (rail, injectors, filter, etc) and it didn't work. I decided to change the O2 in desperation and it worked. 2 weeks later I swapped out the motor for a B18C1 anyway. And I kept the O2 sensor when I gave the wrecking yard my core. heh.