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[Diamond Black Geezer]

RRight, back to first principles... Bringing the V6 back to life after years dormant. Dead battery (alleged good one, but actually dead) that's sortedb, borrowed the battery from the Turbo Weasel. But now...

Started instantly, but spluttered like hell, and refused to idle, as soon as the key is released, dies. Counteract this with the throttle, but for the five or so seconds I dared do this she sounded awful, shuddering (possibly because she was a rev or two from cutting out, possibly one or more cylinders not firing) and every second or two a regular 'cough' or 'hiccup' sound, which was metallic. Didn't sound healthy, so I dared not run her any further, in case there was something I had missed.

Further info which may help - the cam cover gaskets have been done, so everything in 'that area' has been disturbed (and in theory put back right, but obviously not guaranteed)

In your hands, as I'm a little hesitant to go firing her up againfor fear of boggering something up massively. 

[4x4]

Check ht leads are in right order 1st   

[Webby the Bear]

Got there first Martin 

[05omegav6]

When was it last run

[SIR Philbutt]

Fuel quality? - will not be good after that much time

HTH
Phil

[omegod]

 A pot or two not firing makes them run like a washing machine with a brick in it. I'd pull off the fuel filter and drain off as much stale fuel as possible then fit a new one, clean and lube the ICV, lifters will be empty and possibly stuck so will be very noisy. Best of luck

[biggriffin]

Just let it tick over for 15minutes,and sort it self,
The oil will get nice n warm and help the lifters loosen up,and chuck a gallon or two of 99• in the tank.

[Diamond Black Geezer]

Firstly apologies for only replying now, I haven't been ignoring you, just had my head inside an engine bay! And thanks to all replies, too 

Ok so...

1 4x4 - HT leads seem to be right, the lengths appear to say so, but will double-double check
2 Webby The Bear - Too slow 
3 SIR Philbutt - Fuel is definitely a possibility. The plan is to drain it off (58 litres of it - ouch!) and try fresh
4 omegod - will look up cleaning the ICV. Good thought, that. I always imagined them to be just 'sealed for life' they work or they don't
5 biggriffin - As I say, sadly the 'ticking over' thing is a little harder with no ability to idle properly.

So...

The 'cough' is definitely a misfire. Plugs and leads are old. All I can say is the 2 easy to get to cylinders are firing fine (thanks to one of them little thingys you plug between HT and spark that light up)
Runs beautiful over 1000rpm, with a bit of throttle.

Questions:

1 Can anyone tell me how tight the throttle cable wants to be? Mine seemed definitely slack, seemed odd, so I moved it 3-4 notches one-by-one. Not sure if something's moved with the MultiRam being off for doing the rocker covers?

2 How can I check for definite where HT leads should be? Must be a map on here/in Haynes I'm just not finding it 

Thanks again!! Look forward to hearing from you 

[Diamond Black Geezer]

Cleaned out the Idle Control Valve last night after reading above posts.

Will give it a quick turn over tonight, see if that cures the poor idle, before heading out for prior engagement. (rather spend all evening working on the car, ah well...  )

[The Red Baron]

i would look at the egr, had the same problem years ago. wouldnt idle & popping back, but when over 1000 odd revs was ok.
 

[Diamond Black Geezer]

Thanks Red Baron! in what way 'check out' the EGR? I know it was blocked off some time ago (blank probably long since burned through, now) if memory serves do you unplug the EGR, and then see if the engine runs ok - if it does, then you know you've a faulty EGR... or am I talking out of my exhaust? 

Also found the following diagrams via google

http://www.omegaowners.com/forum/index.php?topic=90499.0

and

http://www.omegaowners.com/forum/index.php?topic=90513.0

should anyone else come across this thread with similar issues.

[The Red Baron]

Thanks Red Baron! in what way 'check out' the EGR? I know it was blocked off some time ago (blank probably long since burned through, now) if memory serves do you unplug the EGR, and then see if the engine runs ok - if it does, then you know you've a faulty EGR... or am I talking out of my exhaust? 

Also found the following diagrams via google

http://www.omegaowners.com/forum/index.php?topic=90499.0

and

http://www.omegaowners.com/forum/index.php?topic=90513.0

should anyone else come across this thread with similar issues.

lol, depends what you blanked it off with. might be worth a check.
unplugging will only show a fault up. even blanked off it needs to be plugged in.
have you checked all the vac pipes?. maybe sucking air in somewhere.

[Diamond Black Geezer]

Vac pipes are on the list, and I'm sure what was used to blank it, but whether it be Aldi Cola can, or brown paper (or whatever my dad used) I'm sure it's long since turned to dust 

There's twofold concern with the vac pipes -
1 any leaks which may be present
2 their location. No idea what went back where. Of course we tried to put everything back right, but you can never be 100% if its the first time you've done it.

Has anyone got a description of where the four breather pipes off the back of the top of the MultiRam should lead to? Cheers!

[Marks DTM Calib]

Check those leads, very easy to get them wrong on the 2-4-6 bank as they don't connect to the coil pack in a 2-4-6 order!

[Diamond Black Geezer]

Right...is this right (robbed from another forum)

BULKHEAD
5...6
3...4
1...2
RADIATOR

5...3...1
DIS PACK
2...6...4

Only thing is... the DIS pack is from a Vectra (  ) after someone didn't want to pay for an Omega one. As we know, Vec and Omegas have different plugs, so he spent about half a day splicing the wiring together. Car ran for about a year with this on, btw. Are the firing orders the same, the

5...3...1
DIS PACK
2...6...4

please?
Ta