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[eliteomegaman]

You say the cam sensor was replaced (strange), do you mean the crank sensor?

Sorry you are dead right i mean the crank sensor code 31 

Code 31 is normal when the engine is not running, code 19 indicates crank sensor failure.

Hope you did not replace it based on 31 code!

[/highlight]
YES!!!! My mechanic replaced it  :-? not knowing that on the tech 2 test code 31 shows untill the engine is fired up - when i told him he didn't charge me for his embarrasment 

I would change your mechanic 

Hahaha have had ''3'' different people look at this car - thinking of putting it on YOU-TUBE  !!!!

[eliteomegaman]

How do i unplug Maf sensor & where do i find it?
Looked on Maintenance Guide Index but can't find an entry  :-?

[Elite Pete]

Do you know if the crank sensor he fitted was a genuine one or not?

[eliteomegaman]

Do you know if the crank sensor he fitted was a genuine one or not?[/quote]
Said he got a new one which would have been genuine BUT knowing him he might have got one from the scrap yard!
Having said that if this crank sensor is no good wouldn't it show up on a tech 2 test?

[V6Astra F]

Heres a pic I marked the location of the MAF sensor .


Note that this is on a Vectra B intake but it should give you an idea of what to look for 

[eliteomegaman]

Heres a pic I marked the location of the MAF sensor .


Note that this is on a Vectra B intake but it should give you an idea of what to look for 

Thanks for that but its different on the Omega 

[eliteomegaman]

Have read somewhere on this site that the MAF sensor is 2nd down on the big pipe coming from the air box (hope that's correct?)
Unplugged it & couldn't start the engine! Must be doing something wrong!! 

[eliteomegaman]

When i took my car to Captain Zok at easter with my problem his son did a dignostic check & couldn't find any faults.
He did find that spark plug no.6 was cracked & getting an oil bath!
The Capatain said that the cats where knackered but 1st port of call would be to change the plugs & HT leads which as previously mentioned have now been done (y/day one of the brand new plugs - one week old, was a different colour & replaced but didn't help the problem!
Could the knackered cats be the cause of the misfiring/stuttering  :-? :-? :-?

[Darth Loo-knee]

When i took my car to Captain Zok at easter with my problem his son did a dignostic check & couldn't find any faults.
He did find that spark plug no.6 was cracked & getting an oil bath!
The Capatain said that the cats where knackered but 1st port of call would be to change the plugs & HT leads which as previously mentioned have now been done (y/day one of the brand new plugs - one week old, was a different colour & replaced but didn't help the problem!
Could the knackered cats be the cause of the misfiring/stuttering  :-? :-? :-?

Hold on a minute mate.
A missfire without a code would point I would say to a HT problem. Spark Plugs, Leads & Dispack.
Now you say your plugs that have been in for a week.. that one is a different colour.. where is it a different colour on the electrodes? or on the white part that the leads go onto?

[eliteomegaman]

Hia Darth
i'll have to ask my neighbour as it was him that has done the recent work & told me the new plug was a different colour but didn't tell me where on the plug. have to get back to u on that.
what could be the problem when a plug turns a different colour?

[JasonH]

If you have a cam cover gasket leak and the oil is leaking into the spark plug wells that is likely to be the cause of the misfire. Engine oil is full of tiny metal particles which can short the plug out.

[eliteomegaman]

When Captain Zok's son had a look No. 6 plug was cracked & swimming in oil   
Monday when further tests were done & ht leads replaced one of the new plugs was a different colour (not sure which plug) & the car has only travelled a mile or so - if its the rocker cover then could this be the cause of the misfire/stuttering   :-?
So far i've had 3 people with 3 different theories -
1. Exhaust manifold gasket
2. Knackered cats
3. Leaking rocker covers
I'll take a poke in the dark & based on the different coloured plug i'd say no. 3   
Anyone want to participate in this exciting guessing game  :-? :-/ 

[Marks DTM Calib]

Right....lets consider idle:

1) Exhaust manifold would need to be falling off to cause an idle missfire.......particularly when first started and running open loop.

2) Cats are a possible.....but you say its running rough so that sounds unlikely (but not impossible).

3) Leaking cam cover gaskets.....possible as this could cause a miss fire.

[eliteomegaman]

Thank you Mr Administator 
This problem has been going on for so long now that i'm sure its got a mention in the Doomsday Book 
I know that my wallet has never been so cold due to it being empty & to be totally honest i'm sure rocker cover gaskets replacement will be well over £100 & funds won't stretch that far 
But at least i can sleep at night now knowing what the problem probably is 

[Marks DTM Calib]

Well....as a starter for ten, clean all the breather system out and then clean the plug wells out.

This will cost about 3 quid and may sort it short term