Discovery Series II Ignition Leads

Trying to solve a low revs under load misfire when running on LPG
converted Series II discovery - on my previous Series I Discovery a
change of ignition leads solved the problem so thought I'd try the same
on this one. Trouble is, I can't work out how I can get at the
distributer end of the leads hidden at between the block and the
bulkhead to change them.

A friend suggested looking behind the radio for an access panel but I
think he was joking (apparently an old Fiat X/19 he owned had such an
arrangement behind the driver's seat.)

I'm coming to the conclusion that changing the plug leads means taking
off the inlet manifold and associated pipes and wires (and with all the
stuff from the Prins gas conversion as well) just to get access so it
looks well beyond me - so I'm hoping this group can (preferably) tell me
the secret of the DIY approach, or at least confirm that it's a job for
the professionals.

many thanks

Simon

so Simon was, like...
> Trying to solve a low revs under load misfire when running on LPG
> converted Series II discovery - on my previous Series I Discovery a
> change of ignition leads solved the problem so thought I'd try the
> same on this one. Trouble is, I can't work out how I can get at the
> distributer end of the leads hidden at between the block and the
> bulkhead to change them.
>
> A friend suggested looking behind the radio for an access panel but I
> think he was joking (apparently an old Fiat X/19 he owned had such an
> arrangement behind the driver's seat.)
>
> I'm coming to the conclusion that changing the plug leads means taking
> off the inlet manifold and associated pipes and wires (and with all
> the stuff from the Prins gas conversion as well) just to get access
> so it looks well beyond me - so I'm hoping this group can
> (preferably) tell me the secret of the DIY approach, or at least
> confirm that it's a job for the professionals.
>
> many thanks
>
> Simon

The Thor engine uses two double coils - effectively 4 coils firing 1/6, 7/4,
5/8, 3/2 with a lost spark. These are, as you say, mounted behind the
engine against the bulkhead and are a bugger to get at. The ignition leads
may well be part of the coil assembly (not sure) but it sure ain't the usual
5-minute job to change them.

--
Rich
==============================
Disco 300 Tdi auto
S2a 88" SW
Tiggrr (V8 trialler)

"Richard Brookman" <[email protected]> wrote in message
news:[email protected]...
> so Simon was, like...
>> Trying to solve a low revs under load misfire when running on LPG
>> converted Series II discovery - on my previous Series I Discovery a
>> change of ignition leads solved the problem so thought I'd try the
>> same on this one. Trouble is, I can't work out how I can get at the
>> distributer end of the leads hidden at between the block and the
>> bulkhead to change them.
>>
>> A friend suggested looking behind the radio for an access panel but I
>> think he was joking (apparently an old Fiat X/19 he owned had such an
>> arrangement behind the driver's seat.)
>>
>> I'm coming to the conclusion that changing the plug leads means taking
>> off the inlet manifold and associated pipes and wires (and with all
>> the stuff from the Prins gas conversion as well) just to get access
>> so it looks well beyond me - so I'm hoping this group can
>> (preferably) tell me the secret of the DIY approach, or at least
>> confirm that it's a job for the professionals.
>>
>> many thanks
>>
>> Simon
>
> The Thor engine uses two double coils - effectively 4 coils firing 1/6,
> 7/4, 5/8, 3/2 with a lost spark. These are, as you say, mounted behind
> the engine against the bulkhead and are a bugger to get at. The ignition
> leads may well be part of the coil assembly (not sure) but it sure ain't
> the usual 5-minute job to change them.

The leads are replaceable, but you need to remove the manifold to do so, I'm
afraid. With the manifold off, you can just get at them!! Removing the
manifold is pretty easy really, 6 bolts are all that hold it down, just
label whatever non-std bits as you go. Tip - use 2 nuts to remove the water
pipe mounting stud from the drivers side of the manifold, and replace the
stupid hose clips on the throttle body with jubilee type clips on
reassembly. " hours will do the whole job, easily. Alternator etc stays put,
remove pipe stud, pipes at throttle body and 2 breather pipes, unplug
throttle position sensor, idle speed control motor and vacuum valve, reach
behind manifold and remove 2 upper coil pack securing bolts (8mm, either
side of manifold rear centre bolt), remove 6 manifold bolts (10mm), one at
rear, one at front and 4 in centre, remove throttle cables and lift front of
manifold and tease out forwards and upwards. DO NOT re-use the gasket (£19
from landrover!!!) on reassembly or you will get inlet leaks. Struggle with
HT leads, then reassemble.
Badger.

Badger wrote:
> "Richard Brookman" <[email protected]> wrote in message
> news:[email protected]...
>
>>so Simon was, like...
>>
>>>Trying to solve a low revs under load misfire when running on LPG
>>>converted Series II discovery - on my previous Series I Discovery a
>>>change of ignition leads solved the problem so thought I'd try the
>>>same on this one. Trouble is, I can't work out how I can get at the
>>>distributer end of the leads hidden at between the block and the
>>>bulkhead to change them.
>>>
>>>A friend suggested looking behind the radio for an access panel but I
>>>think he was joking (apparently an old Fiat X/19 he owned had such an
>>>arrangement behind the driver's seat.)
>>>
>>>I'm coming to the conclusion that changing the plug leads means taking
>>>off the inlet manifold and associated pipes and wires (and with all
>>>the stuff from the Prins gas conversion as well) just to get access
>>>so it looks well beyond me - so I'm hoping this group can
>>>(preferably) tell me the secret of the DIY approach, or at least
>>>confirm that it's a job for the professionals.
>>>
>>>many thanks
>>>
>>>Simon
>>
>>The Thor engine uses two double coils - effectively 4 coils firing 1/6,
>>7/4, 5/8, 3/2 with a lost spark. These are, as you say, mounted behind
>>the engine against the bulkhead and are a bugger to get at. The ignition
>>leads may well be part of the coil assembly (not sure) but it sure ain't
>>the usual 5-minute job to change them.
>
>
> The leads are replaceable, but you need to remove the manifold to do so, I'm
> afraid. With the manifold off, you can just get at them!! Removing the
> manifold is pretty easy really, 6 bolts are all that hold it down, just
> label whatever non-std bits as you go. Tip - use 2 nuts to remove the water
> pipe mounting stud from the drivers side of the manifold, and replace the
> stupid hose clips on the throttle body with jubilee type clips on
> reassembly. " hours will do the whole job, easily. Alternator etc stays put,
> remove pipe stud, pipes at throttle body and 2 breather pipes, unplug
> throttle position sensor, idle speed control motor and vacuum valve, reach
> behind manifold and remove 2 upper coil pack securing bolts (8mm, either
> side of manifold rear centre bolt), remove 6 manifold bolts (10mm), one at
> rear, one at front and 4 in centre, remove throttle cables and lift front of
> manifold and tease out forwards and upwards. DO NOT re-use the gasket (£19
> from landrover!!!) on reassembly or you will get inlet leaks. Struggle with
> HT leads, then reassemble.
> Badger.
>
>
Thank you for all this advice - perhaps I'll try some new plugs first!
and then maybe 'av a go
Simon