Thread: disco 2 lpg and backfire -coil problem(hope)

SOunds like you nailed it mate. Well done. I'm just about to replace the o2 sensors on mine. The electronic converters need a good 02 to operate properly and mine are that out they are throwing error codes. Cheers

i would also play with the timing, gas cars seem to need the timing altered a bit from petrol settings to find a sweet spot.

Originally Posted by harry

i would also play with the timing, gas cars seem to need the timing altered a bit from petrol settings to find a sweet spot.

harry i am keen to alter the timing as the car sounds like a v8, drinks like a big block , but goes like a non turbo diesel
I would be pleased if there were direction or advise on how to alter the timing easily (it is a disco 2 )
I am thinking redrilling the crank to reposition
am i thinking corectly?

I would be pleased if there were direction or advise on how to alter the timing easily (it is a disco 2 )

I wouldn't.
The way to do that is electronically via a chip or remap.
Ther eseems to be little knowledge anywhere on this, but BMW ECUs can be rechipped, so it should be possible with LR ones. Mark Adams?

Regards Philip A

I dont know mate - the timing is constantly variable electronic on the D2. When the spark is right they go like a rocket. Mine is a manual V8 but I have an auto D1 on LPG that is properly set up also, and the difference on LPG v Petrol is hard to pick...

Cheers

PS. Mine blows my mates Tdi D1 out of the park, even when we both are towing 2 tonn boats side by side. The TD5 is a better goer than the tdi, but you wont have to worry once the V8 is running right.

Originally Posted by robmess

harry i am keen to alter the timing as the car sounds like a v8, drinks like a big block , but goes like a non turbo diesel
I would be pleased if there were direction or advise on how to alter the timing easily (it is a disco 2 )
I am thinking redrilling the crank to reposition
am i thinking corectly?

I wouldn't go near the sensors, the D2's problem isn't usually the timing map. Your bigger problem is the Impco 200 mixer. You need more throttle opening to get it to move compared to a fixed "ring" mixer so the ECU will retard the timing a bit more on low speed takeoffs. Weak coils will then be overloaded. Really, Impco is the "Lucas" of the LPG world. There is better. Take the mixer off for a couple of days and see what you are missing out on (on petrol).

Once you have done the coils and so long as the plugs and leads are 100% correct you should be safe from backfires. Just remember to re-check the lead you have identified the weak spark at for continuity.

I have a fixed ring mixer in mine...it does reduce intake size, but that can help with torque and on LPG they tend to be a bit torquer (useable) in any event. I did notice a slight drop on petrol with the mixer fitted, but only a fraction and only above about 5000rpm.

Cheers

I have done extra research and found i have a low compression engine being a 99 d2 - believe later they upped the compression ratio. i probably cant expect it to perform well?