Could I have an injector problem?

Tiny
POPPABRAND
  • 2001 MAZDA MILLENIA
  • 15,500 MILES

The engine codes read P0140 and P0303.
I have already replaced the plugs, wires, distributor and rotor. Additionally all the back plugs are black (1, 3 & 5 with #3 the worst). The engine runs rough and has a definite backfire. Could this possibly be an injector? Or could the o2 sensor cause such an obvious misfire?

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Sunday, January 15th, 2012 AT 8:30 PM

1 Reply

Tiny
FIXITMR
  • MEMBER

Rear cylinder bank is running rich apparently.

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Sunday, January 15th, 2012 AT 10:24 PM

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