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[Dracoro]

An update.

Couldn't really figure if the leads are OK, sometimes some sparked, sometimes not. Got multimeter out and only 9 and 11 from leads/cylinders 5 and 3 and no reading at all from 1 (but sure I saw spark once but may be wrong).

So managed to get the DIS module out (what a PITA) as thinking it must not be sending to lead 1 (plus 2,4,6 needed removing plenum etc. anyway).

DIS looks relatively fine, however underneath the sockets for leads 1 and 4 at the end, I can see the plastic peeling away (about a 1mm gap) and I can a layer/sliver or two of dark rust. some small cracks on the top of the "end bit" too. Sorry no pics but the following image is somewhat worse than mine but I can see mine going that way - .

Does this mean it's on it's way out, irrespective of lead condition?

If so, I guess I need new DIS unit, re-fit and see if OK. If not, then new leads to be sure? Can I test the DIS with a multimeter? If so, how?

I see ECP sell the BOSCH and BERU at around £90 and ARC at about £50. http://www.eurocarparts.com/ecp/c/Vauxhall_Omega_2.5_1999/p/Car-Parts/Engine-Parts/Ignition/Ignition-Coils

Given I don't do much mileage (5k year) as have another car, will the cheap unit see the car out? I can handle replacing it if it goes in 25k miles/5 years down the line (doubt I'll still have the car then!!!).

Also, anyone know where I can get the HT leads (car is 2.5 petrol on a facelift model so individual leads from DIS to plug.) as ECP don't quote on their site. Vauxhall had some comedians in their parts dept, nigh on £200, I don't think so!!!
I'm nr Horsham if that helps or if anyone knows good local suppliers.

[dragonlord]

snap got oe hear that looks exactly the same as that that i took out 2 days ago and its stuffed

think the dis pacs last about 100k my elite is on 89k

had o pay 194 for my new one car run like a dream know
theres a couple so youneed numer of the dis pac to get the new one

i got need leads for 28 quid from eurocar parts

and they work fine

they seem to do dis pacs cheaper to
i saw after i spent 194 at local stealers

http://www.eurocarparts.com/ecp/c/Vauxhall_Omega_3.0_1999/p/Car-Parts/Electrical-and-Lighting/Ignition/Ignition-Coils

[Dracoro]

Anyone any opinions on the ARC vs BOSCH for the DIS pack?

Local ECP has both in stock.

[cem_devecioglu]

imo Bosch..

[Dracoro]

UPDATE:

New leads, new DIS coil pack (BERU, no BOSCH in stock - they showed me the ARC one and it didn't appear as well made and the electric connector wasn't was well designed. The BERU unit appeared identical to the BOSCH one and is OEM also apparently....).
DIS - £76 (I got a discount as they didn't have the bosch in stock)
Leads - £27

Anyway, a bit easier to put everything together thankfully! Best advice I would give is to resist hurrying this part, make sure everything is re-connected properly etc.

Just done and a few miles to test and running sweet as a nut! Well happy, I achieved something! God knows how much labour a garage would have charged for this job.

Now, a nice pint of Hophead beckons!

[Brikhead]

The dis pack I'm selling is a Bosch item and has done less than 5,000 miles...
http://www.omegaowners.com/forum/YaBB.pl?num=1286275283

[Dracoro]

Pity I hadn't seen your post this before this afternoon

[dragonlord]

UPDATE:

New leads, new DIS coil pack (BERU, no BOSCH in stock - they showed me the ARC one and it didn't appear as well made and the electric connector wasn't was well designed. The BERU unit appeared identical to the BOSCH one and is OEM also apparently....).
DIS - £76 (I got a discount as they didn't have the bosch in stock)
Leads - £27

Anyway, a bit easier to put everything together thankfully! Best advice I would give is to resist hurrying this part, make sure everything is re-connected properly etc.

Just done and a few miles to test and running sweet as a nut! Well happy, I achieved something! God knows how much labour a garage would have charged for this job.

Now, a nice pint of Hophead beckons!

lol it a right bastart geting it in and out aint it lol

iv got scollosis/curviture of the spine just been back to docs for a shit load more pain killers as i set off bad again
bent up in engine bay getting the dam thing in and out

out of curosity are you getting beter miles per gallon now

son as i put it computer shot up too 20 to the gallon around town

i recon it must ave been goigfor a while as id been getting 15 to gallon round town but no misfire too last week
and that a 25% fuel econamy gain.

may well be worth it if anyones has droped checking out the dis pack  at that rate in fuel saving it will pay for its self in a few weeks

[Dracoro]

I'll update thread if I notice any improvement in MPG. Work a home a lot (so haven't driven it today) and have another car that I use so it may be a little while before I really know if it's improved much

[carbon60]

Hello World,

Just wanted to share my experiences in case it's of help to another.  I originally found this thread using a Google search and most of the info here was of great help.

Having driven the (wife's) car a 2000 Model B 2.5 V6, there was initially no issue, despite her report one during commuting.

I set out to the local accessory shop to get a set of new plugs as these hadn't been changed in 2000 miles, and a set of new plugs are worth their value at the pumps (these days) just on improved MPG.

Having driven the vehicle about 8 miles on a round trip to get the thing through the warm up cycle I stopped for about 2 mins. On restarting the car there was a definite mis-fire, and from the feel of it it was one cylinder on the left side bank (viewed from cabin) The mis-fire was compounded by a more noticeable exhaust note as the unburned fuel from failing cylinder, ignited in the down pipe on the next cylinder's exhaust pulse. This sounded somewhat like a blowing exhaust.

So this may be a tell tale sound for others to listen out for.

Performance and inst mpg dropped off, but no indications from dash light that this was ecu logged fault.

So I stripped down the necessary clutter to change the plugs.

On removing #6 plug (back right when viewed under bonnet) the outer of the plug had rusted and the boot on the lead was covered in a brown dusty rust stain. Clearly water had been entering the plug well and evaporating off causing the deposit on the lead boot.

Yet now the plug was certainly mis-firing. Now not sure how many of you have looked closely at the way a plug is made, but when the insulator part is crimped into the metal base, the plating put on the base cracks off, leaving the crimped part most susceptible to corrosion. If the plug gets exposed to water and heat to exacerbate rusting this crimping swells on the 360° surface surrounding the insulator and it cracks the porcelain very neatly and almost invisibly. This allows for further ingress of water if the contaminant is still present, and the result is a plug that shorts to ground from core to metal base.

Whilst the leads were off I performed the resistance testing of the HT side of the DIS as explained in the video link I found linking from this thread. As all the secondary readings were within spec I was confident I'd located the cause of the misfire.

In this instance replacing the plug(s) cured the mis-fire, but not the cause.

Later that day it rained and on lifting the bonnet I noticed a steady stream of drain water dropping over the #6 plug area and the DIS, and also on the other bank under the scuttle edge. The foam is soaked, and so remedial treatment will be required to solve this issue. The regular rain drain on the offside is unblocked, so I'll need to be creative with the solution to clearing standing water from the lowest point on the scuttle.

Hope that's help to somebody one day.

[bigtoby]

check the 4 breathers that run along the top of the plenum chamber too as this will cause rough runnning and if left too long will blow ur rocker gasket
hope this helps

[msb1973]

Hope it improves my mpg (if the DIS pack is faulty) as I don't get great mpg in town and it's only the 2.5....

What is a flexible nut driver?

I wouldn't replace just the dis pack and not the leads personally, i had both done on our 2.5 cdx just before crimbo, as well as plugs and rocker gaskets and breathers cleaned out and the difference was unbelievable.
Tbh the omega's forte mpg wise isn't driving round town, in all honsesty what car's is? ours is doing high teens maybe 20 if driving like a grandad, on the motorway etc once you get into top gear its 30+ though so pretty good for the size of the car imo

[MutantCav]

Personally I would say that the feint smell of oil is the cam covers leaking oil into the spark plug wells...which will also help the soaked dispac on its way to an early grave...and will need sorting...