2000 Taurus - Duratec Misfire on #6

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sleepdog@optonline.net - 26 Feb 2006 03:58 GMT

Just read the code P0306, #6 cylinder misfire. Can anyone run down the
list of possible causes? This engine has coil-on-plug. It just
happened tonight, never had it before. The engine only has 54,000
miles on it and has been maintained pretty well. Regular oil and
filter changes, coolant change too.

Thanks!

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Tom Adkins - 26 Feb 2006 04:09 GMT

> Just read the code P0306, #6 cylinder misfire. Can anyone run down the
> list of possible causes? This engine has coil-on-plug. It just
[quoted text clipped - 3 lines]
>
> Thanks!

In approx. order of probability:
0. Dead spark plug
1. Faulty COP
2. Arcing COP boot
3. Faulty injector
4. Low compression
5. No injector pulse or spark pulse from PCM

There are likely other possibilities, but my bet is one of the first 3.

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sleepdog@optonline.net - 26 Feb 2006 04:44 GMT

>> In approx. order of probability:
>> 0. Dead spark plug
[quoted text clipped - 3 lines]
>> 4. Low compression
>> 5. No injector pulse or spark pulse from PCM

Thankfully #6 is facing the front of the car!

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sleepdog@optonline.net - 26 Feb 2006 16:25 GMT

Hey Tom,

I swapped the COP boots between #6 and #5 cylinders and picked up
P0305, #5 cylinder misfire. Not having access to all the cool
diagnostic tools, seemed like the thing to do. I'm not driving this
car until I get this figured out.

Would this indicate that I should replace the faulty COP? I ran the
motor last night in the dark and did not see any light shows.

Was also wondering if equivelant Bosch Platinum plugs would be good
replacements if I decide to change the plugs.

Thanks!
sleepdog

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Backyard Mechanic - 26 Feb 2006 18:42 GMT

> Was also wondering if equivelant Bosch Platinum plugs would be good
> replacements if I decide to change the plugs.
>
> Thanks!
> sleepdog

I thought you were a regular on here!!

Discussed, again and again...NO! Bosch makes a plug that fits, just havent
figured out how to make 'em run reliably, yet.

Since Motorcraft OEM Plats seem to run fine for at least 80,000 in most,
what would be the benefit, anyway?

Signature

Yeh, I'm a Krusty old Geezer, ..ah screw it!

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sleepdog@optonline.net - 27 Feb 2006 13:22 GMT

>> I thought you were a regular on here!!

I am I just could not remember, though I did have a hunch. Thanks!

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Tom Adkins - 26 Feb 2006 18:51 GMT

> Hey Tom,
>
[quoted text clipped - 11 lines]
> Thanks!
> sleepdog

Did you swap the whole COP or just the boot? If it was just the boot and the miss
moved to #5, the boot is arcing through. If you swapped the whole coil then it could
be either one. Look closely at the boot. Look for carbon tracks at the plug opening.
Looks like a pencil mark with a "halo" around it. Also look at the side of the boot
for a "spot" with a "halo" around it. This would be where the spark is exiting.
Make sure you put silicone dielectric grease in the boot before putting it on the
plug. As for Bosch plugs, NEVER use them in a Ford product. You will very likely
develop strange driveability concerns after a few thousand miles if you do.

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sleepdog@optonline.net - 27 Feb 2006 13:25 GMT

>> Did you swap the whole COP or just the boot? If

I swapped the coil and boot, so I'll take another look. The car is
still under warranty so I am going to see what the dealer can do for
me, since the blend doors also do not work and the driver's side door
inside plastic keeps popping out. Also a recall on the front coil
springs... been saving these issues up for the inconvenience of losing
the use of the car for a few days.

Thanks!

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sleepdog@optonline.net - 28 Feb 2006 05:42 GMT

The dealer replaced the ignition coil for the one cylinder, cost only
the $50 deductible from the premium care warranty and got a free
loaner/rental for the day. The only place I could have gotten a
motorcraft coil **today** was from a dealer and would have been double
in price. Got the car back same day too. Not bad. But considering
what I paid for the 6yr warranty... $$$ oh well.

The Chrysler Pacifica rental was pretty plush, leather, navigation,
dvd... the wagon pales in comparison.

Thanks everyone for your help.

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