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[nen3906]

Good morning
                 How easy is it to change the HT leads on my 2.5 V6, looking at them, they appear to go behind the engine somewhere !!!!

[feeutfo]

Good morning
                 How easy is it to change the HT leads on my 2.5 V6, looking at them, they appear to go behind the engine somewhere !!!!

Its a pig frankly. You cant see the dis pac. All done by feel but it can be done. Very easy to get the order wrong. There is a guide in maintenance section i think, and have a search there are a phew hand drawn diagrams on which plug goes where. Hth

[tmx]

one lead at a time

[Marks DTM Calib]

Take the plenum off and remove the cable tray on the passenger side and its pretty easy.

[tunnie]

Good morning
                 How easy is it to change the HT leads on my 2.5 V6, looking at them, they appear to go behind the engine somewhere !!!!

They lead to a DIS pack mounted on the back of the engine, replace one lead at a time, as the number sequence on the dispack is not the usual format you would expect.

[tmx]

changed a Vectra V6 Dispack and that was

1 3 5  
2 4 6

but the v6 vectras dispack has a different p/n to a v6 miggy one so knowing vaxuhall its problably different

[Marks DTM Calib]

changed a Vectra V6 Dispack and that was

1 3 5  
2 4 6

but the v6 vectras dispack has a different p/n to a v6 miggy one so knowing vaxuhall its problably different

There the same DIS packs (although the V6 used 3 different ones through the production era which explains where the confusion can come from).

And all have the same HT connections:

1 3 5
4 6 2

And there is a simple reason why its like this.

Thats because the setup uses a wasted spark and given the firing order is 1-2-3-4-5-6 you will be firing the following

[td]Cylinder[/td]
[tr][td]Firing [/td][td]Exhaust[/td][/tr]
[tr][td]1[/td][td]4[/td][/tr]
[tr][td]2[/td][td]5[/td][/tr]
[tr][td]3[/td][td]6[/td][/tr]
[tr][td]4[/td][td]1[/td][/tr]
[tr][td]5[/td][td]2[/td][/tr]
[tr][td]6[/td][td]3[/td][/tr]
[/table]

So, given that the coil pack has 3 coils in it arranged as

0  0  0
3  3  3
0  0  0

It means that when you connect 1-3-5 to one side then the other ones must be 4-6-2  

[nen3906]

Thank you, ill be trying it this weekend.