I am working on a 1997 mazda b2300 (ranger Clone).. it has the 2.3 SOHC ford engine.. i am getting 2 different codes.. P0304 and P0171 one is cylinder four missfire and the other is System too lean bank 1... I have replace the spark plugs and wires sence they were origanal and should have been done a long time ago... now i am still geting the 2 same codes... i have checked around for any vaccume leaks and to see if anything was disconnected.. but everything looks good.. also the fuel filter has been changed not too long ago so i know thats good.. any ideas???

well i am thinking along the lines of a fuel injector... what do you guy think???

Fuel injector seems logical to me.

I changed the #4 injector a few weeks ago and it did the trick... Thanks for the reply

Hi thanx for tha injector tip I too am havn the same problem. I will try that out and see if it works but one question. Do I need to get an obd1 reader or what? Plz help.

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1994 Mazda B2300 2.3L, throttle body spacer, intake muffler delete, no cat, 3.73 gears

How did you determine that you needed to replace a fuel injector and which one was bad?

My ranger 4cyl has hesitation when applying gas. I have checked about everything suggested

What year did fuel injectors get introduced? I have 1988 & have owned it 10 days. It looks real old school to me. Thanks for any knowledge. Checking Chiltons manual tomorrow.

Google diagnosing fuel injector issue. Fuel injectors usually work or they don't. A severe constant misfire would occur. Hesitation issues are commonly cause by vacuum leaks or in some cases fuel pressure issues.

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1999 MAZDA 2500SE, 2.5L 4-clanger, 5 speed, Green n slow. Rangers as daily drivers since 1988.
ASE Certified Mechanic, Builder of Show Destroying Protouring and Classic cars..