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[danzigfan]

Hi guys, got a missfire yesterday evening, I checked the codes first and got 12, 31, 129
I believe I can smell a bit of gasoline from the engine bay.
Spark plugs replaced 30.000 km ago + the shortest coil broke and was replaced at that time.
It's a FL 2.5 V6
Any ideas before I start removing plenum?

[danzigfan]

Forget about the codes....I unplugged the EGR to get access to spark plugs. No code present now, missfiring all the time,  lack of power is very noticeable

[danzigfan]

Got the plunum off, plugwells are dry, no oil in them (vectra cam covers).

[Enceladus]

Your symptoms suggest that the coil pack has failed. Was the replacement a genuine Bosch part? Or some other aftermarket brand?

Was the engine running when the crank sensor code appeared.

[danzigfan]

Tested the resistance on suspected coil lead and got 4.5 Kohm. So I went to to test a set of new coil leads I still have and got from 5,5 shortetst to 9Kohm being the longest.
Seems fine? 🤨
Coil pack (behind the engine) is still factory one I believe
Spark plug lead is no name brand.
If only I could test which one isn't firing but impossible with plenum on

[Nick W]

Tested the resistance on suspected coil lead and got 4.5 Kohm. So I went to to test a set of new coil leads I still have and got from 5,5 shortetst to 9Kohm being the longest.
Seems fine? 🤨
Coil pack (behind the engine) is still factory one I believe
Spark plug lead is no name brand.
If only I could test which one isn't firing but impossible with plenum on

Have you considered something like THIS? There are other similar testers, I had one that just touched the plug lead.

[danzigfan]

Will be added to the basket soon, but I don't have it now.
And I can't remove bl..y wiper arm to get to the coil pack. I almost forgot how cramped it is behind the engine, omega was running almost flawless for more than 5 years

[Enceladus]

There are three coils in the pack and each provides spark to a pair of cylinders at a time. One in each bank. So if one cylinder has weak or no spark then it's pair will be similar. The cylinder pairs are on the forum somewhere. Search for wasted spark.

[Nick W]

Will be added to the basket soon, but I don't have it now.
And I can't remove bl..y wiper arm to get to the coil pack. I almost forgot how cramped it is behind the engine, omega was running almost flawless for more than 5 years

More MONEY 


I have one but have never needed to use it on wiper arms, firm jiggling has always been enough

[danzigfan]

I have three of those pullers....it won't budge

[danzigfan]

[danzigfan]

These are from left bank, all look the same

[Nick W]

How long have they been fitted, as they're utterly oppsed


And does your scuttle leak? That might explain the brown marks around the insulators.

[danzigfan]

They've been in for 20k miles and yes, the scuttle doesn't leak as I sealed it per guide on the forum. Plug wells were dry

[Enceladus]

Are some of the sealing washers missing or damaged on those plugs?
If the scuttle was leaking it could have dripped water onto the coil pack. And damaged it.

Try new plugs since they look like they need to be changed. However my guess is the coil pack. If yours is original it must be a record for longevity.

Fold the wiper arms upwards before using the puller. Partially refit the nut to keep the puller central, if needed. That should get the wipers offf.