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[blackviper90210]

On way home from Coventry with the kids, went to overtake when a flashing orange symbol lit up and felt juddering when under load.
Stopped plugged code reader in, misfire on No.1 cylinder. Erased the code drove off. All fine for about 5mins, misfire back again

Raining and not enough light to look tonight, but any suggestions on where to start looking for the cause please?
Typical, need the car to get back to my unit tomorrow night!! Not impressed.

TIA 

[biggriffin]

Water ingress from scuttle down on to coilpack.

[blackviper90210]

I've been keeping a keen eye on the scuttles and are always clear. 

[4x4]

Check exhaust isnt losing hair at rear,as that can cause a missfire,but would start with checking coil pack,plugs and cam cover gasket.

[05omegav6]

I've been keeping a keen eye on the scuttles and are always clear. 

Irrelevant. Water drains down the join onto the plug of the 246 coil pack, and down the passenger wiper spindle straight onto the plug of the 135 coil pack.

Scuttle needs resealing as per the guide

[powerslinky]

I've been keeping a keen eye on the scuttles and are always clear. 

Irrelevant. Water drains down the join onto the plug of the 246 coil pack, and down the passenger wiper spindle straight onto the plug of the 135 coil pack.

Scuttle needs resealing as per the guide

+ 1  . . .exactly  what Al said above   

[blackviper90210]

Point taken guys. Will look at that in the morning. Cheers

[blackviper90210]

Morning all,

I'm obviously blind atm as I cannot find the guide on repealing the scuttle.

Does anyone have a link to the guide please?

Many thanks

[powerslinky]

Morning all,

I'm obviously blind atm as I cannot find the guide on repealing the scuttle.

Does anyone have a link to the guide please?

Many thanks

Not sure there is an actual guide for resealing the scuttle

But just put  "Resealing Scuttle"  into the search facility & there are several

fairly recent threads explaining what to do         HTH

[blackviper90210]

Morning all,

I'm obviously blind atm as I cannot find the guide on repealing the scuttle.

Does anyone have a link to the guide please?

Many thanks

Not sure there is an actual guide for resealing the scuttle

But just put  "Resealing Scuttle"  into the search facility & there are several

fairly recent threads explaining what to do         HTH

Cheers for that Big Al. I did you the search facility initially without any luck as well as going through the maintenance guide prior to my last post.
I'll have another butchers again! 

[TheBoy]

Pull the CP out and inspect it. Symptoms suggest knackered CP, plug or cam cover gasket.

Unlikely to be water ingress causing a P0301 - the connector is waterproof.

[05omegav6]

Pull the CP out and inspect it. Symptoms suggest knackered CP, plug or cam cover gasket.

Unlikely to be water ingress causing a P0301 - the connector is allegedly waterproof.

Fair point well presented... only suggested resealing scuttle in response to the suggestion that the scuttle drains were clear

[blackviper90210]

Hi all,

Following advice, I went out and checked the scuttle and insulation foam, all dry and good.

Checked the cam covers, no oil visibly leaking. Took the coil pack out and found the following:






Plug wells dry.
The business end of the spark plug is dry, but the top of the thread of the plug is oily??

Now I've been losing oil for some time but not on the floor, by large amounts. I've not seen blue smoke out of the tail pipe and I average 29/30mpg with mixed driving. Car doesn't seem to be lacking in power, up until yesterday with the misfire.

Would be grateful for some ideas please.

TIA

[biggriffin]

Cam gaskets/o-rings leaking
That's a classic oil in plugwells picture.

[05omegav6]

Those boots don't look too clever 1/4" missing from the plug end...

Oil useage can be explained by mileage/service history resulting in worn valve seals and general engine wear...

There is evidence of oil ingress from the front edge of the cam cover, this obviously drains down over time, and eventually one of two things happen... 1. plug wells fill with oil drowning the coilpack contact on the plug; or 2. the plugs become loose over time, allowing the oil to drain onto the electrodes...

Both result in a misfire, but 1. kills the coil pack. Yours seems to be 2.

I'll wager that the plugs weren't exactly tight

Have seen far, far worse... check the breathers and make sure the plug threads are all dry and nice and tight, and you might get away with waiting until the weather warms up a bit...