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[Andy H]

If it runs fine on petrol but misfires on LPG that is quite likely to be caused by worn out spark plugs - LPG needs a higher voltage to strike a spark and also burns hotter and causes faster plug erosion than petrol.

[Lazydocker]

If it runs fine on petrol but misfires on LPG that is quite likely to be caused by worn out spark plugs - LPG needs a higher voltage to strike a spark and also burns hotter and causes faster plug erosion than petrol.

Quite possibly. IME Iridium plugs are of no benefit with LPG 

[Kevin Wood]

If it runs fine on petrol but misfires on LPG that is quite likely to be caused by worn out spark plugs - LPG needs a higher voltage to strike a spark and also burns hotter and causes faster plug erosion than petrol.

Quite possibly. IME Iridium plugs are of no benefit with LPG 

.. and standard plugs come out looking like new after 40k miles... Now, if the LPG system is running lean...

[X30XE]

There was some chatter on the Saab forum about iridium plugs not doing the DIS pack any good. (Something to do with poor electrical conductivity in trade off for better longevity).  Don't know if this applies to other GM cars too. 

[Marks DTM Calib]

I would like to hear the physics behind that theory 

[Doctor Gollum]

Probably be some beer influenced man maths involved

[Migv6 le Frog Fan]

Another 3.2 Elite estate with LPG has popped up on the bay.

http://www.ebay.co.uk/itm/vauxhall-omega-estate-repair-or-spares-/152405093145?hash=item237c0d2b19:g:yowAAOSwPCVYAmYA

[RobG]

If the "number plate is worth £500" why doesn`t he sell that?

[X30XE]

I would like to hear the physics behind that theory 

I suspect it might be people getting confused between damage caused by not fitting resistive plugs tbh.  Some of them are a bit... yeeeehaw 

[X30XE]

If the "number plate is worth £500" why doesn`t he sell that?

Cos it takes years to sell a private plate at it's full value.  Unless it's incredibly rare and desirable.

[Fraggles Rock]

If the "number plate is worth £500" why doesn`t he sell that?

Cos it takes years to sell a private plate at it's full value.  Unless it's incredibly rare and desirable.

MoT history looks ok, couple of trackrod ends and donut bushes and that's... suggests that it's been relatively looked after over the years

[tunnie]

If the "number plate is worth £500" why doesn`t he sell that?

Cos it takes years to sell a private plate at it's full value.  Unless it's incredibly rare and desirable.

MoT history looks ok, couple of trackrod ends and donut bushes and that's... suggests that it's been relatively looked after over the years

Pictures tell different story, seller needs to get some lessons on using a camera 

[Doctor Gollum]

Clearly been stood a while

Rust spot on wing could either be a poor, older repair or storage damage...

[Marks DTM Calib]

I would like to hear the physics behind that theory 

I suspect it might be people getting confused between damage caused by not fitting resistive plugs tbh.  Some of them are a bit... yeeeehaw 

Well all an iridium plug offers you is the ability to run at higher combustion temperatures.

If you consider how a coil works then there is pretty much nothing it can do to the coil pack to damage in fact, pretty much every coil pack failure we see is due to the core failing (corrosion or separation of the laminations) resulting in less energy being stored and a lower power spark.

[JamesV6CDX]

Sold for £810. Anyone on here?