cel-43: fuel supply - Honda Prelude Forum

rentien · 07-27-2004, 11:25 PM

i got a cel-43

i looked in the helms... and it says it could either be the ho2 sensor, or a bad connection between the ho2 sensor and the ecu (they call it the ecm)

the car seems to drive fine...

does anyone know what it could be, i thought if it was the o2 sensor, that you'd get a cel-41? whats the difference?

and for this cel-43, is this not the o2 sensor in the header, but an o2 sensor somewhere else?

prelude2005 · 07-28-2004, 06:00 AM

I am having this problem, as I type this. And after the longest time I think we finally figured it out.

Replace your Fuel Pressure Regulator, this seems to be my problem, I just haven't got around to replacing it.
Reason I know this is my problem because we hooked up a pressure gauge to my fuel supply line (by fuel filter), and the line would not hold a constant 40psi even after the fuel pump would turn on, it would slowly drop to 0psi.

Do you have problems starting?

rentien · 07-28-2004, 07:28 AM

the thing is, i don't have an IAC valve, my idle works from keeping the throttle butterfly stuck open, when i just start, i have to rev for a little bit until the car warms up, so if the car did have problems starting i would not know... so as far as i know, it feels fine when i start it up, and when i drive it, it drives fine...

prelude2005 · 07-28-2004, 12:21 PM

CEL 43 can also be the O2 sensor heater like it says.
How often does the CEL come on? Is it on after right after start up, during drive?

rentien · 07-28-2004, 12:29 PM

it used to be during the drive, because i have a cel-12 on top of it (EGR )... now i think it might be immediate i'm not sure... i'll have to check tonight doing what the helms manual says... hopefully it is just loose connections like thehelms suspects

just curious, what are the symptoms your car is displaying? do you get bad driveability?

i am planning on tuning REAL soon, as in 2 weeks so i don't want anything to be messing the tuning up, like the fuel pressure regulator or anything like that...

prelude2005 · 07-28-2004, 12:37 PM

The driving isn't any different. However I used to run extremely rich before the FPR went out to where I would shoot flames. Now I don't run rich at all (no flames), matter of fact, I think I might be running a little lean.

And another thing is this happend right after I had my VAFC tuned, I reset all my settings to zero for now.

rentien · 07-30-2004, 10:10 AM

does anyone know if this could affect tuning? (i'm about to go in for tuning...)

prelude2005 · 08-01-2004, 07:45 AM

Well, changed the FPR, still loosing fuel pressure.

I am thinking it is the fuel pump now....

rentien · 08-01-2004, 01:29 PM

those are getting to pretty expensive parts too huh

prelude2005 · 08-01-2004, 03:00 PM

Quote:

Originally Posted by rentien

those are getting to pretty expensive parts too huh

Yup!

I'll keep you posted.

BTW- I am still throwing CEL 43.

JuicedH22 · 08-01-2004, 03:02 PM

good luck, I threw a code 7 and a code 43 for the looooongest time, and couldnt get rid of it, then I rebuilt my motor and it magically went away...

92-h23a1 · 08-02-2004, 11:16 AM

I have the same problem, i'm throwing CEL 43 but sometimes after filling up on a full tank of gas after starting it up, it would just die right after starting. Takes about 10-15 minutes maybe longer, for it to start back up. Sometimes while driving and I come to stops, the idle starts dropping a few times to 0 and bouncing back up to 750. I'm about to take it in for a tune up but I'm sure this might be a fuel problem. What do you guys think?

prelude2005 · 08-02-2004, 11:46 AM

Quote:

Originally Posted by 92-h23a1

I have the same problem, i'm throwing CEL 43 but sometimes after filling up on a full tank of gas after starting it up, it would just die right after starting. Takes about 10-15 minutes maybe longer, for it to start back up. Sometimes while driving and I come to stops, the idle starts dropping a few times to 0 and bouncing back up to 750. I'm about to take it in for a tune up but I'm sure this might be a fuel problem. What do you guys think?

I am having idle probs as well, I am pretty sure this is due to fuel supply.

flip1199 · 08-02-2004, 12:04 PM

when does the cel come on? is it right after start up or after a couple mins of driving?

prelude2005 · 08-02-2004, 12:09 PM

Quote:

Originally Posted by flip1199

when does the cel come on? is it right after start up or after a couple mins of driving?

Couple mins of driving, usually when in cruise or throttling it in 4th gear into vtec.

flip1199 · 08-02-2004, 12:27 PM

it's your o2. change it and it should go away.

prelude2005 · 08-02-2004, 02:14 PM

Quote:

Originally Posted by flip1199

it's your o2. change it and it should go away.

But I am losing fuel pressure in the lines. According to gauge.

delguiner · 08-09-2004, 06:51 AM

i was also getting a code 43 like you were... i replaced my O2 sensor with the NGK universal and i havent had a problem since

delguiner · 08-09-2004, 06:54 AM

Quote:

Originally Posted by prelude2005

I am having idle probs as well, I am pretty sure this is due to fuel supply.

i hear you guys... im having that exact same problem also... my car decides to ilde very low sometimes at a light or at a stop.... my 1st cylinder is actually misfiring for some reason and i havent figured out why yet. Maybe you guys could be experiencing the same thing i am

eric739 · 08-18-2004, 05:11 PM

I am having this same type of problem. Sometimes my car runs tip top then it starts that idle problem crap. My Check Engine Light never comes on though. I replaced my O2 sensor with the NGK for the 92 Si and didn't make 1 bit of difference. I figure since it only happens to me when I am crusing or at idle it must be a fuel problem. When I get paid I am going to replace the fuel pump and filter. If that doesn't work I may try to get my ECU worked on or something.