Vehicle & Technical > Discovery

Misfire...but only on LPG

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JumboBeef:
My Disco (1996, V8, LPG) has started backfiring sometimes, and running a bit rough, but only on gas  :huh:  It runs fine on petrol.  The plugs were changed about 1,000 miles ago, and the leads last year.

Any ideas please!

dxmedia:
Electrics, change the plugs, leads, dizzy cap and rotor arm (if it's got em - landies aint my thang) again.

If it runs fine on petrol then 99.99999999999999% of the time with LPG it's electrics.

Try hotter plugs and pull the gap in about 0.05 and see if that helps too.

morson4x4:
i used to have this problem in my 1990 disco i took to a garage and they told me the lpg was on its way out i dont trust it no more if what he suggested not working i would take it to a garage

dxmedia:

--- Quote from: morson4x4 on February 08, 2010, 09:14:53 ---i used to have this problem in my 1990 disco i took to a garage and they told me the lpg was on its way out i dont trust it no more if what he suggested not working i would take it to a garage

--- End quote ---

Just as a matter of interest, do you have single or multipoint?  What did the garage say was on it's way out?   All the parts for building / repairing systems are very commonly avaliable and LPG systems are supprisingly easy to work on, especially if it's single point.

JumboBeef:
I love my LPG, it has saved us so much money over the nearly three years we've had the motor.  Ordered a new cap and arm and will fit those first to see if that will sort the issue.

Thanks for the replies.

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