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[Canon Cam]

Hi guys,

Well, time to seek the collective wisdom of the OOF once again.

Yesterday, swmbo called me to say that theOmega was playing up and nearly cutting out when stopped at lights etc.

Now, I have had this issue once before and solved it by cleaning out the IACV and another time I have replaced the cam shaft sensor when the revs bounced up and down at idle.   I therefore thought it must be time to clean the IAVC again.

Stripped it down today even thought the paperclip test had shown NO recorded fault codes. :-/

Anyway, plenty of carb cleaner, and also, for good measure cleaned the butterfly thing on the air intake and cleaned out both large and small breather pipes and i thought the job would be a "good 'un".

Took the car for a spin.   all fine for 10 miles or so with plenty of stopping at lights.

Then, took it for a quick blast on the dual carraigeway and when stopping at the next exit junction back came the problem the missus had complained of.

Best way to describe would be a slight "hesitation".  Now, my guess would be that either one of the plugs or leads to one of the cylinders is breaking down, so will look into that tomorrow.

But, do you guys think this would be a likely cause of the symptoms?.....and would either of these two things cause a fault code or not? (as I said earlier, not fault codes are being stored and the engince ECU symbol is not being lit up when the symptoms happen.

Thanks for your help in advance.

[Entwood]

AFAIK if a plug lead/plug breaks down then no fault code is produced as the DIS/electronics is quite happy that it has "produced" a spark ... even though it hasn't reached the cylinder ! if that makes sense ..

This happens, for example, if the breathers get blocked, the cam cover gaskets leak and the spark plug holes fill with oil .... eventually the leads break down and the spark "shorts" via the oil .... misfire occurs but no fault code.

I would check the plug holes for oil leakage, then the plug leads and lastly the plugs themselves....

HTH

[goonv6]

I've got this exact same problem. Am going to clean the ICV tomorrow. I thought mine was the TPS but I'mtold that these don't fail. Do you think your ICV may be faulty rather than dirty?

[feeutfo]

Hi guys,

Well, time to seek the collective wisdom of the OOF once again.

Yesterday, swmbo called me to say that theOmega was playing up and nearly cutting out when stopped at lights etc.

Now, I have had this issue once before and solved it by cleaning out the IACV and another time I have replaced the cam shaft sensor when the revs bounced up and down at idle.   I therefore thought it must be time to clean the IAVC again.

Stripped it down today even thought the paperclip test had shown NO recorded fault codes. :-/

Anyway, plenty of carb cleaner, and also, for good measure cleaned the butterfly thing on the air intake and cleaned out both large and small breather pipes and i thought the job would be a "good 'un".

Took the car for a spin.   all fine for 10 miles or so with plenty of stopping at lights.

Then, took it for a quick blast on the dual carraigeway and when stopping at the next exit junction back came the problem the missus had complained of.

Best way to describe would be a slight "hesitation".  Now, my guess would be that either one of the plugs or leads to one of the cylinders is breaking down, so will look into that tomorrow.

But, do you guys think this would be a likely cause of the symptoms?.....and would either of these two things cause a fault code or not? (as I said earlier, not fault codes are being stored and the engince ECU symbol is not being lit up when the symptoms happen.

Thanks for your help in advance.

Does sound like tick over if its only plays up at stand still/foot off the gas. I guess you followed the 4 pot guide? Tick over and miss fires do not light the eml in my experience, although cam sensors on the 4 pot, and crank sensors on the v6 can take their own sweet time in raising a code it seems....

[Canon Cam]

Ok, things are looking worse!!!

There is oil in each one of the spark plug wells!!!!

And, just to make it worse....checked the oil levels and it is too high!! (missus said she had put a dorp of oil in it about a week ago....grrrr.....)

So.... could it be HG gone or just as a result of over filling?...and draining from teh sump down to proper level and cleaning up will sort??

[Canon Cam]

.........or hopefully the cam cover gaskets???

[Canon Cam]

ok....so took about 20 mils of oil out of each plug well using one of those kids   medicine pipets. Also cleaned up the plug caps.

My guess is that so much oil in each plug well is a fairly severe amount!!!  also drained oil down to normal level.

Just about to take it for a test run so see if the misfire continues

[Ken T]

Mine had oil in 3 plug wells until I did the breathers. When I fitted the LPG there was a miss on one pot, you could hear it ticking, and I found one of the plug rubber boots was split and 2 others soaked in oil. You can get a replacement set for about £14, so I fitted a couple and the missing has gone.

Ken

[Canon Cam]

Ok will look into that.

Any other suggestions as to possible cause.....and why is it very intermittent???....some drives not a single miss-fire, then others...miss-fire on every stop...then it is slow to pull away.  Definately as if not firing on all cylinders...then suddenly....away it goes?

[The roadrunner]

Ok will look into that.

Any other suggestions as to possible cause.....and why is it very intermittent???....some drives not a single miss-fire, then others...miss-fire on every stop...then it is slow to pull away.  Definitely as if not firing on all cylinders...then suddenly....away it goes?

My 3.0 Mig is doing exactly the same thing, lumpy idle, poor performance, jerky response, you can hear and feel it misfiring.

I've put the intermittent nature down to the fact that as you drive force causes the oil to move around and enable the HT voltage to find earth via the oil instead of the plug.

Mine is worse climbing steep hills, until today I had no idea why, but now it makes sense as the oil is being forced into mechanically unsympathetic places by the high angle.

I checked the plugs today and 2 were full of oil, I drained what I could with a turkey baster and tried to mop up the rest with kitchen roll.

There is a definite improvement after clearing the oil but still misfiring, probably knackered the plugs and leads that have been submerged for gawd knows how long, tomorrow I will check the other side of the engine.

Looks like, clean breathers, replace rocker box gaskets and new plugs and leads will be the order of the day.

I'm going to have to take out shares in Halfords at this rate.