2000 MPV code P0305 - misfire question

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dtatem · Newbie Joined: 22 Aug 2010 Posts: 2

I have a 2000 MPV with 102k miles. Just pulling out of the garage the engine ran rough and check engine light was blinking. This morning the light is on but not blinking and it seems to be running normally. Code is P0305 - misfire on cyl 5.

I read a bit on the forums about the coils and plug/wires. On first check they seem tight but I haven't replaced anything yet. I also read that the coils on the 2000 are different than other model years. Are there any diagrams I can view on how to get to the plugs/coils before I just start taking things apart? They seem quite buried and I only found instructions for 2002+.

Is there a god way to test the coils before replacing them?
any help would be appreciated
thanks
dave

steve12955 · MPVClub Resident Joined: 23 Jan 2004 Posts: 580

Hello,

Your 2000 has a single coil that's mounted on the rear cylinder bank. Follow the spark plug wires and you'll see it but I don't think it's the coil if it's limited to one cylinder. If the CEL is on steady then the code has been hard set. It could be as simple as a bad spark plug or wire. If they haven't been replaced it may be time. It could also be the a couple of components in the fuel delivery and emissions systems (MAF sensor, water temperature sensor) but if defective they should throw other codes which won't be limited to a single cylinder.

Is there only one code?

Good luck,

Steve

dtatem · Newbie Joined: 22 Aug 2010 Posts: 2

Thanks for the help Steve.

It is only showing the 1 code and seems to be driving fine. It was obviously rough when it was blinking last night. I will replace the plugs/wires and take it from there.

Will the CEL reset itself if I fix the wires or should I reset the code to see if it comes back?
I'm not sure how to get in to the wires/plugs - I will figure it out but are there instructions online or this site I haven't found yet?
thanks again
dave

scross · Full Member Joined: 07 Nov 2005 Posts: 234

There are no doubt instructions out here somewhere, but if so I haven't seen them in a while. Here is a good place to start for general mechanical info; yours is probably an "L3" (1st Facelift) model, but if not then start poking around in the 2nd Facelift info.

http://forum.mpvclub.com/viewtopic.php?t=24639

The CEL should reset itself eventually, but it could take a while. It's probably better to either have it reset by someone with a code reader (AutoZone and some other parts stores will do this for free), but you can always just disconnect the battery for maybe ten minutes or so; there is probably also a power fuse you could pull, but right off hand I don't know which one. The downside to pulling the power is that you will lose your pre-programmed radio stations and you will also need your radio security code (if you have one), and that the computer will lose it's memory and may take a little while to relearn your driving style, if it has this function.

steve12955 · MPVClub Resident Joined: 23 Jan 2004 Posts: 580

Hello,

Plug and wire replacement is very easy on the 2000-2001 and is no different than other cars if you've ever done it. However, to be sure of the diagnosis, I recommend that you first switch the plug from #5 to another cylinder and see if the misfire follows it. The #5 cylinder is easy to get at, it's the cylinder in the middle on the front bank closest to the radiator. The cylinders are ordered:
1-2-3
4-5-6
as you face the engine.

Some tips:
- you need the appropriate socket and correct length extension. This is important on the rear bank since clearance is limited. I suggest taping the socket to the extension so it will come out of the deep recess.
- be careful pulling off the wires from the plugs. If dielectric grease wasn't used on the wire boots, they may be fused to the top of the plugs. Use a dab of this grease inside the boot when you reinstall.
- use a bit of anti-seize compound on the plug threads so they are easily removed next time.

I've had good luck with Autolite Platinums (think it's #AP105 but double-check). Tighten them only 1/4 turn after the washer contacts the head.

To access the plugs on the front bank, remove the IMRC actuator (the aluminum box with a cable attached to the throttle body area) and hold to the side. On the rear it's easier if you remove the coil and move it out of the way. There's also a thin ground wire attached to one of the bolts - be sure to reattach it when you put the coil back on.

Good luck,

Steve