2004 MPV Coil & Plug Replacement

dannysentme · Newbie Joined: 05 Jan 2010 Posts: 9

Hello All,

I would like to thank everyone on this forum for their valuable insight. Bubba - you inspired me to do my own work, and believe it or not...it was a success!

I studied the content on here concerning 2004 MPV rough idle, rough acceleration because those were my MPV symptoms to a T! I even changed out the IAC and that did nothing. After months of this, the van finally started throwing CEL codes P0300, only to turn out as Random Misfire. Finally, it narrowed it down to P0303. I ordered three coils from www.rockauto.com STANDARD MOTOR PRODUCTS UF406 (which I was referred to from this forum) and found that their parts were very competitive and shipped in a timely manor. I also ordered 6 new plugs - MOTORCRAFT SP433 Platinum Plugs. I called and confirmed with the Mazda Dealer to confirm.

As recommended by another post, I too left the throttle body hanging after removing the four bolts and simply moved the manifold off to the side, never disconnecting or draining the coolant lines. I took some pics so that you can see what a 2004 looks like, hopefully they'll attach.

As coil 3 is in the back driver side, I replaced it with a new one. Then I threw the old coil 3 in coil 6, just to see if the problem and CEL follows the coil.

After doing so, miraculously, the van runs like the day we bought it! I've driven it up to Salt Lake City and back since the job was completed last Saturday and no codes, no rough idle in forward or reverse, and no rough acceleration! Yes!!! I now have my sanity back along with a little peace of mind and a sense of accomplishment. I'm no mechanic, so overall, it took me about 3-4 hours. If I did it again, I know I could do it in half the time.

Thanks again! My hope is that it will stay well. I'll re-post if it doesn't work out.

Danny

12Ounce · MPVClub Addict Joined: 19 Aug 2007 Posts: 1745

In an earlier posting, I think you mentioned the camshaft position sensor. Was that changed also?

dannysentme · Newbie Joined: 05 Jan 2010 Posts: 9

I inquired at Checker O'Riley about the Camshaft Position Sensor and it was a $21 part. In telling the clerk about my plans to replace the coils and plugs, he said to not purchase the sensor, for now, and see what happens after I replaced the coils and plugs. So at this point (fingers crossed) the van is running great. I am anticipating coil 6 (old coil from #3) to throw a code, but it hasn't yet. It really makes me wonder if by chance all the coils were good, and that perhaps I had some bad plugs all along?

keoni50 · Newbie Joined: 10 Nov 2004 Posts: 42

I was asking a question in a topic above if it's possible to remove the Intake manifold without removing the clip on the PCV. I had a hard time trying last time and had a Stealer replace the hose. What do you think??
Thanks

darom · Full Member Joined: 12 Sep 2005 Posts: 176

If you are asking about back side PCV hose clamp on the intake, I used this tool after multiple cuts to my hands:
http://www.sears.com/shc/s/p_10153_12605_00947390000P

The $40 paid back since the removal takes now about 15 seconds.

Regards!

keoni50 · Newbie Joined: 10 Nov 2004 Posts: 42

Nope that's not what I asking. I already have the tool but during the last time I could not get the clamp off. My question is and pertains to the coil packs: Can I remove the intake manifold without removing the PCV hose and just set aside the manifold so I can get at the bad coil pack on the #1 Cylinder? Or once the manifold is unbolted then I will be able to take the clamp off?? I had a such luck using the tool!

Thanks

Keoni

benjimpv · Newbie Joined: 01 May 2008 Posts: 35

scross · MPVClub Addict Joined: 07 Nov 2005 Posts: 2661

sky2lvy · Guest

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