Question about 2002 Mazda MPV

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2001 MPV Runs Rough at Idle and Low end Throttle

I used my buddy's OBDII tester and it pulled p0303 and p0174 codes.
#3 misfire / lean bank 2

I've changed the plugs/wires/coil. I suspected it was the coil as I pulled #3 wire at the coil and while the engine was at idle there was no spark and no change in engine idle. I pulled all the other wires and there was spark on 1/2/5/6. #4 wire had no spark also at idle. I am going to put the stock coil back in to check and see if there is a difference.

As for the lean bank 2 code, I replaced the upper intake gasket. I didn't change the lower [and I know I may have to] but I just wanted to see if there would be a difference and there is still no change in engine. I sprayed carb/throttle cleaner around all areas and I didn't see/hear any vacuum leaks or change in engine rev.

As for the PCV hose, I changed that last year.

I'm just stumped that there is no spark in #3 and #4 at the coil. I even revved the motor thinking there would be some spark at higher rev but no go.

I ran across a thread about a defective crank angle sensor. I'm wondering if this could be possible. My other buddy said it could be dirty O2 sensors.

Also I took the crank angle sensor off and cleaned it and the connector. I started up and no difference. I also checked #3 and #4 at the coil and still no spark at idle or rev. I even switched both spark plug cables at the coil and no difference in engine run.

ANY SUGGESTIONS? Please Help!

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This could be a bad fuel injector. Lean implies low fuel to the cylinder which will cause a misfire.

Posted on Feb 01, 2009

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