43 Fuel supply system Ok i have CEL 43 being throwen out at me I have a B20B in a EK Hatch i just finished making the car run right no check engine nothing car runs great. Problems im having now is just back pressure from my exhaust since im still on a stock one would this be causing CEL 43. Other Issue is i keep Dis Connecting my Fuel Relay for Security Reasons. I think it got clamped (the wires) so i taped up the wires so none will touch the CEL left. for 3 hrs i was driving no prob then on my home the CEL comes out agen but no probs with the car. SO i pull over turn off the car and the CEL goes away???? WTF???????? u think it might be the O2 Sensor? the Back Pressure? the clamp on the wires? any idea if its the clamp ill seal all the wires up agen need suggestions. thanks!

 

43 was a o2 sensor on my car.

 

really so u think the Back pressure might be causing this??

 

No one knows???

 

no, having a stock exhaust wouldnt cause this problem

 

Its just a soft code. My experience with modified engines is that the CEL usually comes on but its not a major issue if it goes away as soon as you shut off the car and start it again.

 

so its nothing major cuz my car was running fine then that cel juss pops out if i dont have any probs ill be ok but if anything ill juss get a new relay for safe measures

 

mine comes on sometimes also... does it come on when you let it idle for a minute or 2?? or when your driving it..

i have a big cam and mine comes on sometimes when i let it idle for too long cuz it runs hella rich at idle i think it throws the ecu off or something

 

well mine turns on from what i see it is when i cruise at like 60. I was driving home from my girlfriends house and then all of a sudden the check engine comes on. I stop on the side turn off then on. the CEL is gone?? so its juss a mis-info? or is it something that is fixable???

 

[QUOTE=Other Issue is i keep Dis Connecting my Fuel Relay for Security Reasons.[/QUOTE]

Well now everyone knows, get a alarm.
So what ecu are you using? and what does the fuel pressure look like?

code 43 could be just about any part in the fuel system.
pump, regulator, injectors, fuel filter. 02 sensor.

 

I have this problem in my car. I am FIRMLY convinced there is no fix for it.

Comes on once in a blue moon....or sometimes twice within the minute....doesn't effect my driving in any way, shape, or form...and I have NO ******* idea what it is...

Don't worry about it, you'll save yourself the headache.

Wish I knew what was happening with mine though...and don't say "change your O2 sensor w/ a friend's" because it's so randomly I can drive it for a month and it won't turn on, but then it'll turn on maybe twice in the same day (until I just turn the car off, then turn it back on (just key flip while driving..stays stored by the light doesn't come back on)).

Weird assssss problem.

SOrry at OP, I'm startin to threadjack....but my point was simple, there's NO fix for this code Or at least I'm convinced there's not one - not for my problem anyway.

 

i agree it is not an easy fix. It drove me crazy for about 2 weeks.
Lucky for me I have a wideband and was able to datalog. I found that everytime i got the code the engine would run very lean. Not good for a b20. When I say lean I mean around 17-20. Like everyone else the code would clear when I turned the car off and back on again.
To the Op if you have the time to troubleshoot it, do it.
A guy who had this problem here on h-t a few weeks ago ended up running some fuel injector cleaner and that solved his problem.
This code can be caused by dirty injectors.
Good luck.

 

since i work for firestone i did the firestone way of cleaning injectors and stuff with clean the TB their Fuel Injector cleaner (it works better than **** from autozone) and the a kit that lets liquid in ur Intake that cleans the grease out after that the car was actually faster and no check engine light yet and i was cruising all day so yea find out my problem