Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Dishevelled Den on 02 February 2011, 17:11:15

Title: Cyl 4 misfire on a Desmond
Post by: Dishevelled Den on 02 February 2011, 17:11:15
I suppose I can't complain as this is the first real trouble I’ve had with the car – Z22XE engine) in the 5 years (approx) of ownership

It happened the other day after I got past some nose pickers by using the modest acceleration that the car has.

I let the speed bleed off on a light throttle back to where it had been before, as the speed decreased there was a pronounced triple hesitation in quick succession from the engine setting off the emissions light.


My reader (thanks Nige) tells me that code P0004 is present – described as Cyl 4 misfire.  The car seems to start and drive normally and there has been no decrease in performance, no overheating, water loss or inappropriate smells.

I was able to clear the code and turn the light out but am of course wondering what has set the events in motion – plugs, coil pack (or whatever the equivalent is) or impending gasket failure.

I will be looking at the easier options shortly but am asking for some views on the possibilities.
Title: Re: Cyl 4 misfire on a Desmond
Post by: tunnie on 02 February 2011, 17:26:48
i'd start with fresh set of plugs!
Title: Re: Cyl 4 misfire on a Desmond
Post by: PhilRich on 02 February 2011, 18:57:35
As you already know Den, No.4 is nearest the scuttle & as such is 1st in line for any water ingress from a leaking scuttle joint, so the best thing to start with is remove the coil (dis) pack & check for either water or oil in the plug orifices especially No.4!  Also of course, check the condition of the rubber plug covers on the pack & the condition of the plugs themselves & if they've been fitted a good while it may be time for a change as Tunnie says :y
I hope it turns out to be something & nothing, but please keep us posted? ;)
Title: Re: Cyl 4 misfire on a Desmond
Post by: TheBoy on 02 February 2011, 19:30:06
Check for water or evidence of water around the plug, and signs of damage to cp
Title: Re: Cyl 4 misfire on a Desmond
Post by: Dishevelled Den on 02 February 2011, 19:36:43
Thanks T, PR and TB,  I'll do the simple job first and report back. :y
Title: Re: Cyl 4 misfire on a Desmond
Post by: cem_devecioglu on 02 February 2011, 19:51:17
problem is likely to be electrical.. checking sockets, ignition components are first on the list.. but before anything I would check the condition of misfiring cylinders spark..
Title: Re: Cyl 4 misfire on a Desmond
Post by: Dishevelled Den on 02 February 2011, 19:58:53
Quote
problem is likely to be electrical.. checking sockets, ignition components are first on the list.. but before anything I would check the condition of misfiring cylinders spark..

Thanks cem, I be doing that tomorrow. :y
Title: Re: Cyl 4 misfire on a Desmond
Post by: Jimbob on 02 February 2011, 20:21:39
saw the title and thought wet plug, hows the weather been, and are you parked facing downhill?
Title: Re: Cyl 4 misfire on a Desmond
Post by: SJKOO01 on 02 February 2011, 20:24:04
Zoo Lou,

If the rubber spark plug cover do look as they've had it, the break part in your fingers (brittle) and don't seem to be the usual rubber give in them as they should.  Then you can get a replacement kit from your local dealer (4cyl - 9195820), they also come with fresh plug springs to.

Hope that helps  :y
Title: Re: Cyl 4 misfire on a Desmond
Post by: Dishevelled Den on 02 February 2011, 20:27:40
Always on a level surface and the weather has been not too bad lately in terms of rain JB :y

Cheers GM. :y
Title: Re: Cyl 4 misfire on a Desmond
Post by: markfree on 02 February 2011, 21:46:10
Quote
I suppose I can't complain as this is the first real trouble I’ve had with the car – Z22XE engine) in the 5 years (approx) of ownership

It happened the other day after I got past some nose pickers by using the modest acceleration that the car has.

I let the speed bleed off on a light throttle back to where it had been before, as the speed decreased there was a pronounced triple hesitation in quick succession from the engine setting off the emissions light.


My reader (thanks Nige) tells me that code P0004 is present – described as Cyl 4 misfire.  The car seems to start and drive normally and there has been no decrease in performance, no overheating, water loss or inappropriate smells.

I was able to clear the code and turn the light out but am of course wondering what has set the events in motion – plugs, coil pack (or whatever the equivalent is) or impending gasket failure.

I will be looking at the easier options shortly but am asking for some views on the possibilities.

I'm afraid I'm guilty of the aforementioned crime.

My wife said it's a miracle I can get out of the car the amount of bogey's nose-pickings there are on the floor mat  ::)

My monies on the plug leads/dis pack being duff.
Title: Re: Cyl 4 misfire on a Desmond
Post by: Dishevelled Den on 03 February 2011, 14:27:55
Had a quick fiddle this morning and found the following;

As the plugs were extracted;

(http://i698.photobucket.com/albums/vv345/Catdracula/SDC10438.jpg)

Front;

(http://i698.photobucket.com/albums/vv345/Catdracula/SDC10440.jpg)

Back;

(http://i698.photobucket.com/albums/vv345/Catdracula/SDC10439.jpg)

No.4 well;

(http://i698.photobucket.com/albums/vv345/Catdracula/SDC10449.jpg)

(http://i698.photobucket.com/albums/vv345/Catdracula/SDC10447.jpg)

Front of pack;

(http://i698.photobucket.com/albums/vv345/Catdracula/SDC10454.jpg)

Rear;

(http://i698.photobucket.com/albums/vv345/Catdracula/SDC10451.jpg)

Water bead on the support pillar at the front of the pack;

(http://i698.photobucket.com/albums/vv345/Catdracula/SDC10460.jpg)

The well saturated area above the rear of the coil pack;

(http://i698.photobucket.com/albums/vv345/Catdracula/SDC10445.jpg)

I've installed new plugs and will monitor the situation over the coming days.  It would seem that there has been some water ingress into the coil pack well as I found some condensation both in the well and on some areas of the pack body.  Oxidation seems to have developed in the two rearmost plug wells with no.4 being worst affected.
Title: Re: Cyl 4 misfire on a Desmond
Post by: Kevin Wood on 03 February 2011, 14:40:40
Looks like it might be prudent to try and seal the scuttle cover a little better where the who halves join? Failing that, is water getting behind the windscreen seal and running down the underside of the scuttle cover?

Kevin
Title: Re: Cyl 4 misfire on a Desmond
Post by: Dishevelled Den on 03 February 2011, 14:53:24
Quote
Looks like it might be prudent to try and seal the scuttle cover a little better where the who halves join? Failing that, is water getting behind the windscreen seal and running down the underside of the scuttle cover?

Kevin

Yes I'll have to look at that K as I suspect it will cause further problems.

I'll dry out that foam insulating medium and get some black sealer into the area for a starter.
Title: Re: Cyl 4 misfire on a Desmond
Post by: Jimbob on 03 February 2011, 15:34:19
yup, same happened to ours, will worsen with the weather, seal the scuttle and all will be will
Title: Re: Cyl 4 misfire on a Desmond
Post by: cem_devecioglu on 03 February 2011, 16:25:42
looking at the rust , #4 plug seems to be swimming for some time.. but although darker, its condition better than  I expect ..