Random Misfire

[lisence]

I have a 2000 Mazda Mpv which is indicating a random misfire code P0300. I have changed the spark plugs which helped, and then replaced the coil pack...but it still running rough. Does anyone have any advice as to what could be the problem? Please respond !! Thanks JK

[mazdatech177]

check for recalls, pcv hose faulty

[12Ounce]

Originally Posted by lisence

I have a 2000 Mazda Mpv which is indicating a random misfire code P0300.

I'm working on the same problem. Also P0306. 2000 MPV with 120k miles. I'm replacing plugs, cables, and air filter (all original) as a start. The cables show "hi volt leak" spots.

To get to everything a bit better, I took off the upper intake manifold. Wow! What a mess. The EGR passageway looked totally plugged. Hard, dry build-up. I don't no why there was no related code. Quite a cleaning job. I don't know exactly what caused all this carbon build-up. Also ended up removing the intake "spacer" (?, the aluminum piece that includes the runner control butterflys.) PCV path looks OK, but I'm gonna replace valve just in case.

Hope to get running again today or tomorrow.

Did you ever find your problem?

[12Ounce]

A little update ...

After new plugs, cables, and upper manifold cleaning: I finally got the MPV back together ... well, "together" enough to try out. It runs great! And the engine light went out.

But it idles high. I noticed the IAC valve was a bit dirty ... I didn't clean it as that would have introduced another variable.

Think I will now clean the IAC.

[12Ounce]

Another update ...

Before I could clean the IAC, a new code showed up. P0507. All makes sense.

Cleaned the IAC, and then engine idled down .. and the light went back out after a few miles.

[ucs711]

hi i have mpv 1998 ES can some one know how to programe remote key i have key but i dont know how to do it