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Discussion Starter · #1 ·
Facts:
Code 43 problem ( fuel circuit system by Haynes manual)
Accord 93 DX, 5 MT, AEM short ram, Cat Back exhaust, Failed emissions testing, Hydrocarbons off the chart and the Carbon Monoxide high ,Fuel cap passed. Need to be rectified before Nov.11.

Things checked: injector Resistor Resistance, Injector resistance check both in spec. Unplugged O2 sensor and code 41 registered , reset ECU and 41 did not return but 43 returned. The check light comes on at highway speeds (43), hard driving nothing.

Next planned steps: Check O2 sensor resistance/voltage and Timing.

I am open to further input.
Thanks!!
 

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Sounds like you are running rich (increased emissions). Could be a problem with your FPR or maybe one of your injectors is leaking.
 

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Discussion Starter · #3 ·
Whats FPR?

Thanks 2000 EBP Si. So it may be cheaper to change all the injectors, or to have them tested and replace the one (if its just one) at the dealership? Also probably the excess fuel killed the catalyst? yuh talking new converter now!!
 

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FPR = fuel pressure regulator

It was just a guess, but since you failed your test, it sounds like the engine is running rich. The FPR is that little round looking thing bolted on the fuel rail. Your cat is probably fine, a little excess fuel won't damage it.
 

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TPS = throttle position sensor

The TPS tells the ECU what position the throttle (gas pedal) is at. The ECU uses this info to determine how much fuel to inject into the clyinders to maintain the proper A/F ratio. If the TPS is sending the ECU false info, the ECU could be injecting too much fuel causing the engine to run rich.
 
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