i have a 94 ex and it throwing a code 43 fuel supply systems does anyone have any idea wat could be causing this

 

A code 43 means that your car is running too rich. The O2 sensor is detecting too high of an oxygen level in the exhaust. Is your gas mileage terrible?

I still periodically get that code on my car, and haven't figured it out yet. The shop manual (download from online manual thread in DIY section) has diagnostics for it. The solutions to fixt the problem are to either replace the O2 sensor or replace the ECU. Does the check engine light come on every time you drive the car?

 

no i only come on one in a while. idk if its the gas thats in it cuz it was sitting for about 3 months but as milage kinda bad

 

I'm having a similar problem. I don't have a solution yet. I replaced my O2 sensor and that didn't solve the problem.

 

Ruptured fuel pressure regulator, faulty coolant temp sensor, or perhaps dirty air filter might cause this code.

good luck

 

which coolant sensor would cause this because wen i unplugged one of the coolant sensor for the computer it threw a code 6 air filter is good only thing left if the fuel pressure regulator how do u check if thats bad??

 

The TW sensor could be the fault. It might be sufficiently in error to cause code 43 w/o setting the fault code for sensor open/shorted. There are calibration checks. At 32degF- 5kohms, -68F - 3 kohms, 104F - 1kohms, 190F - 200-300 ohms. The resistance should be measured across the two contacts. No tolerance is stated, but I would think anything w/i +/- 0.5k ohms would be OK. Manual says to fully warm the engine, measure resistance,and replace sensor if resistance is not w/i 200-400 ohms, which would be well off the calibration pts above assuming warmed engine temp of 180-190F.

Pull vacuum reference line to the fuel pressure regulator and sniff. If you smellstrong smell of gas, the diaphragm is likely ruptured. This allows raw gas to enter the throttle body through the vacuum line.

good luck

 

I see that you have current active posts on here.

Did you ever figure out the code 43/poor gas mileage problems?