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[Broomies Mate]

Searched but cannot find.

In a fit of rage, I pulled the lot out again to try and cure my mis-fire, but cant remember the order of the leads on the DISPack (oval connector).

Can someone please let me know which lead goes where?  Thanks

[Marks DTM Calib]

   5-3-1

   2-6-4

[Broomies Mate]

   5-3-1

   2-6-4

You are a diamond.  Thanks! 

[Marks DTM Calib]

Actualy, cant remember if that is right, got a mental blank....give me a mo

[Marks DTM Calib]

yeh, it is:

5-3-1
2-6-4

[Kneepad]

Actualy, cant remember if that is right, got a mental blank....give me a mo

The last time this happened, he was convinced he had lost his post count.

[MV62960]

Hello,

It is easy to make an error (I did), though the numbers are written on the coil pack, you are working just by touch as the pack is so awful to get to. On the odd side the sockets on the pack are logical, ie they line up with the plugs in order. My mistake was to assume the same on the even side. The shortest lead (spark plug 6) doesn't goto the nearest coil pack socket, but instead the middle socket on the coil. I made this error and thought I had ruined the car, but all was ok once corrected.

[Broomies Mate]

Actualy, cant remember if that is right, got a mental blank....give me a mo

You were spot on, and I thank you implicitly.

Unfortunately, despite removing everything (again) the misfire is still present.

I have since deduced that the rear multi-ram doesnt actuate.  The front one happily moves at 4k RPM but the rear one does nothing.  I have swapped the actuator with that from the SAI, but still nothing.  I am wondering if this is causing part of the problem?

Still doesnt explain the misfire at idle though.

I really, really need your help guys.  Even if you are throwing ridiculous ideas at me, I'd be happy to receive them.

Note:  New DISPack (Bosch) New Plugs (NGK) New Leads (OE).

[Brikhead]

New DISPack (Bosch) New Plugs (NGK) New Leads (OE).

Is it compression test time yet?

Also, the rear multi ram, it's just a guess on my part but maybe it wont open up fully untill the engine is under load? Revving in neutral may not be enough to cause the vacuum to build up?

[feeutfo]

I've not got that job right first yet.  . Pita.

[MV62960]

Can you clarify, the engine didn't miss-fire on idle BEFORE you changed the coil pack, leads and plugs? If so, it can only be the order you have reconnected the leads.

[Broomies Mate]

Can you clarify, the engine didn't miss-fire on idle BEFORE you changed the coil pack, leads and plugs? If so, it can only be the order you have reconnected the leads.

I can confirm it did not misfire before I changed anything, although I changed the DISPack because it failed miserably.  The leads and plugs were changed because the Mis-Fire started two weeks after I changed the DISPack.  Could I have fitted a faulty Bosch DISPack?

I can quite honestly say that if the leads were in the wrong order, I'd notice it straight away!  This is definitely, definitely not the problem.


Right.  Compression test shows identical compression (as near as makes no difference) on all 6 cylinders.

I'm now contemplating taking the car to a Fuel Injection specialist.  Either that or a very deep river.

Any other suggestions? 

[2woody]

is the vacuum signal present at the fuel pressure regulator ?

and yes, the rear multiram flap only opens with some load on.

have you checked that the earth leads are present near the coil pack and that the plug leads are fully home on the plugs.

[Broomies Mate]

is the vacuum signal present at the fuel pressure regulator ?

and yes, the rear multiram flap only opens with some load on.

have you checked that the earth leads are present near the coil pack and that the plug leads are fully home on the plugs.

How would I go about checking the FPR?

Rear Multi-Ram should actuate at 1k RPM as far as I know.  Front one actuates at 4k, and does this.  Rear one doesn't move, but all pipes are perfect, the actuator was 'borrowed' from the SAI.... no splits in pipes etc.

Plugs and leads have been in and out twice, and hammered home on the final visit 

[2woody]

vacuum signal comes from the branch on the idle speed regulator pipe - pull it off the FPR and see if there's vacuum. other than that, you can't really do much else without kit.

how about manifold vacuum leaks ?

or air flow meter death ?

so it's just misfiring at idle only and not when you're driving. Even at low revs / high load ?