Ok, so I'm getting code 43 pretty much every time I drive the car, occasionally it won't show but most of the time it does. The car bogs/sputters on low throttle and a little bit at idle when it's cold. It's also a little on the laggy side compared to before. On some nights if I hold it at 2k rpm at idle, it'll kinda drop back down and come back up and drop back down and come back up a little. I know code 43 is related to fuel supply and all this hesitation leads me to believe it's the fuel filter that's clogged. However evert thread on code 43 that I've read claims it would be the o2 sensor.

Does my theory make sense or is it still most likely the o2 sensor?

 

Fuel filter, fuel pump, fuel pressure regulator... Check all of these. Fuel filters are cheap, might as well replace it because it is one of the easier ones and cheaper ones to change.

 

I doubt it's the fuel pump cause it's a recent Walbro 255 pump so it would be odd for it to be finished already. I'll do the fuel filter and let you guys know if that fixes it.

 

ive had this prob several times bro take a look at ur ecu there a label q31 its very possible its burnned up try another come and road test

 

I'm not 100% sure what you're suggesting. Are you saying a part of my ecu could be fried? Please explain, thanks.

 

if u take the cover off the ecu and look at the circuit board i believe its q31 look it if it broken or burned almost sure thats ur prob or just substitue a know good ecu

 

But my ECU is tuned on Hondata, wouldn't it be somewhat problematic just swapping a random ECU into my setup?

 

are you running any sort of wideband? Or just the stock o2 i had this problem came out to be it had a bad o2, but that was on a stock p72

 

if it IS a burned part on the ecu, 9 times out of 10, that paart can be bought at a place that sells it (resistor, IC, as long as it wasnt a chip)

q31 sounds like a label for a spot, where a resistor, IC, etc would be located,

look for burn marks around where it was soldered at the board.

you can desolder the burned part, purchase a new one (with some experience) and resolder the new one on

 

ahh, i completely forgot about this one, O2 will also cause this code. You should also check that.

 

That's what I'm planning on doing. I'm gonna do fuel filter first, cause that's what I have a hunch that it is and it's cheap. If it's not that, then o2 sensor. If all fails, then I'll check the ECU for burns but I really doubt that's the case.