Vehicle & Technical > Discovery

Misfire...but only on LPG

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martyn:
I've had two disco with LPG ninety nine times out of hundred its the leads put the best leads you can buy on also good quality plugs champion  etc i never bothered with making the gap bigger or smaller put what the manufacture states

 if there is any weakness in the system along these lines gas WILL find it out petrol is more forgiving and thats why you don't get the back fire

Devon-Rover:
And you did buy a Genuine cap and Rotor arm? Not cheap but will work. Having a gassed V8 means having to have top notch Ignition system.

JumboBeef:
Well, replaced cap and arm.  The old cap and arm looked OK, but put the new ones on.

Still backfiring.

Checked the leads, they *seem* fine.  They are 12 months old.  Should these be next on my list?

Plugs are about 6 months/2,000 miles old.

Thanks,

lcruiser100s:
Ive Had the same issue on a single point system. It would be backfire after initial burst of acceleration, Ok on motorway stretch.  Just turned the mixture up a bit, seemed to have cured it. fingers crossed.

Range Rover Blues:
Close the plugs to 27 thou, if you are buying new then fit NGK BP6ES, not BPR6ES.

Check compresion on the engine too, backfiring can be a symptom of a burned out valve.

If you can get one, a Gunson's flashtester will check the strength of your sparks.

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