just worndering could someone narrow down this code for me a lil bit is code 43 says fuel supply but thats kind of hit and miss the car is real sluggish on take off after it hit running temp. and does not ideal good after it warms up also it really bad on gas just did this swap ab 8 months ago and no proplem until now any help would be appreciated:

 

come on guy i know someone has had this problem before

 

Unfortunately code 43 is probably THE single hardest code to effectively diagnose quickly, and with 100% certainty in each step of diagnosis.

The problem is that it is a very vague code. It's actually easier to troubleshoot this code if the engine won't start. Possible causes include:

Primary o2 sensor*
Fuel injector(s)
Fuel pressure issue (pressure regulator, poor fuel pump performance
Contaminated fuel
Bad ECU

I put an asterisk by o2 sensor because MOST of the time replacing that fixes the code 43. In the event replacing the o2 sensor (with a quality unit from only Denso, NTK, or Honda dealership) doesn't clear the code and return normal driveability then you'll be running through the tedious process of checking the other stuff having to do with "fuel supply."

 

Oh and here are a few pertinent flow charts that might help you out.

First is a test for the oxygen sensor, although I'll be honest here - I've seen new o2 sensors fail these tests and I am 100% positive the sensors were good because they never triggered any CELs affected gas mileage, etc. in the newer OBD2 cars we installed them on at my shop.

 

just what i thought thanks for the info tho i'll try the o2 sensor first then ill go from there i have alot of spare parts for the d's just wanted a starting point . thanks tho

 

Most likely your fuel filter.

D16Z6 in what model civic and how many miles?

 

If you plan on using a used sensor (I wouldn't personally) then at least test it first. It would ultimately be frustrating to swap in an o2 sensor you're assuming is good, only to not change the symptoms and/or code. You need to work with absolutes, not probabilities.

 

its a 95 civic dx the motor has ab 40 thou on it it was a rebuilt motor . yeah its a used 02 i guess you would say it was in my motor that i blew up but was only in it for ab 2 to 3 weeks before that happened so i was just guessing that it would still be good dont hurt to try it since i have it i also have a new fuel filter ill try that also it was for another car but o well . this one need to be fixed tho it my everday car . thanx

 

The service manual says that, when driveability problems accompany code 43, you should focus on the fuel system. With that said, I'd start with replacing the fuel filter. If that does not help, then measure the fuel pressure and, while you are at it, test the FPR. The next step would be to check the fuel injectors.