I have a 1991 accord that I just bought and its giving me a check engine code of 43 which is FUEL SUPPLY SYSTEM and it say it is a problem with 02 Sensor circuit or fuel system. I was just wondering if anyone had any ideals on where to start with this problem? Thanks for your help.

 

Anyone have any ideals?

 

ya i had that problem reciently

o2 sensor
egr valve
fuel injectors
fuel injector resistor
fuel pump
fuel pressure regulatior

those are your problems when was your last tune up good luck man

 

Check 02 sensor wire for rips and tears.
Replace your fuel filter (always a good thing to do)
Run fuel injector cleaner through the system (injectors might be clogged up)
Check your spark plugs/wires.
EGR? Maybe?
Do the checking first, before you buy anything.
I got 02 out in mine ('95 Accord), just went out one day going through the Baskin Robins drive through (fkn horsht!) lol.

 

I just put a fuel filter on it and new plugs and a pcv valve. Wires looked good. Also ran a fuel cleaner through it

 

I've always called this "the dreaded code 43" LOL The name of the code is misleading, it was confused in translation I think. As a general approach I consider the code to mean the engine is running rich. I.E. the O2 sensor is reporting unburned oxides to the ECU.

 

Hmmm... all that and still on?
How about your 02 sensor wires. If one of them is broken if will throw "too rich code" your sensor will be reading 99.2(volts?)
I have seen a lot of 02 sensor wires been broken(even before the plug) and people mistaken that for burned out 02. Try to get a bone yard one and replace yours with it.

 

How do you check an O2 sensor to see if its bad?

 

If you want to do troubleshooting on your car, you need to get a service manual. Helm is the best. They are $70, from Helminc.com, but you can probably find a used one on E-Bay or somewhere else. You can get cheap manuals from Autozone or Advance, but I don't think the cheap ones have information on testing O2 sensors. Good luck Link below


http://www.helminc.com/helm/se...GABED

 

O2 sensors are extremely hard to test. They have to be at operating temperature(about 650 degrees) and that still wont tell you if it is responding to changes in O2 levels. If you replace the O2, do so only with a NTK or Denso. A bosch or other aftermarket may work for a little while, but I promise you will replace it again within 6 months. It's not worth the $25 to $30 you save. NTK and Denso are $105 to $115 at hondiscountparts.com
I'm not saying it's definately the O2 but it's highly likely that it is. Check fuel pressure and proper FPR operation.

 

Anyone else have any ideals?

 

Ever fix it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by milllllk &raquo;</TD></TR><TR><TD CLASS="quote">Ever fix it?</TD></TR></TABLE>
inquiring minds need to know LOL
People at this website seem to ask for a lot more info than they want to share

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondadude &raquo;</TD></TR><TR><TD CLASS="quote">I've always called this "the dreaded code 43" LOL </TD></TR></TABLE>
Dreaded??? They're not that bad, just time consuming to verify. I always check fuel pressure first on em. If it's in spec, and there are no large vacuum leaks I physically take a look at the o2. the 91 ex model has it under the back of the engine, oil tends to run down the wiring from leaks above, (distributor and valvecover) damage the sensor. If everything checks good to this point, i'll hook up a voltmeter to the o2 signal line and go for a drive watching what the voltage and fuel pressure does when it recodes.

If there are no vacuum leaks and the fuel pressure stays in spec, it's almost always the o2.

 

how do you know what the fuel pressure spec is I want to check mine at idle it is around 30 and when i rev it it is at like 40 or so