Vehicle & Technical > Range Rover

Back-firing 3.9

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dod51e:
Hi Guys,

The old girls is misfiring.  It occurs on both petrol and LPG and only when first started up and cold.  When it is warm there is no problem and runs fine.  My first thought was it was too lean on LPG.  This was checked and OK and still back firing, switched on to petrol and it still did it!  The back firing is through the exhaust and the inlet.....too advanced and too retarded?  Once eventually over about 2000 rpm or fully warm there is no trace of any misfire.

Your thoughts gentlemen please.

Yoshi:
This happened to my series 3 2.25 petrol.  Same thing, started minor and just got worse and worse.

Turned out to need a new dizzy and all was fine after that!

ATB

Dan

ben-dent:
Mark i would say it is the dizzy a mate had a 3.9 disco that did the same he replaced plugs, leads, cap, rotor arm, cat's Lambda's, and it still back fired, borrowed one of my dizzys and it fixed it,

clbarclay:
Its not something daft like the nut clamping the dizzy isn't quite tight enough and the dizzy can be very slowly rotated by the vibrations, advancing the ignition too much.
Found the dizzy on a mates V8 wasn't bolted down tight enough and could be turned by hand. Probably why it died half way up a gully, 4 minuets before the pay &play site closed :lol:

dod51e:
Thanks for the info guys.  I must concur following the advice that it must be the dizzy.  Had a look around for one and guess what... it's non of those listed!  It seems to be the later 35 limb dizzy but with a two spade connector rather than the three pin and definitely not the earlier two cable model.  Typical Land Rover.
Still, one on order now and hopefully I'll be able to find an adapter cable to fit (or make fit!!!)  [-o<

Cheers

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