Vehicle & Technical > Range Rover
Missing a beat
Garth:
Hi Chaps and Chapesses
Sorry to be boring but this is really doing my head in.
RRC 3.9 efi Duel fuel, Tartini gas convertion (draw through with Lambda sensor)
Has a missfire mainly noticable on tick over.
Work done so far:-
New plugs BP6ES set to .9
Changed plug leads for Second hand (but quite new) 8mm High Power Silicone
Different dizzy cap (again second hand spare)
Cleaned and re terminated coil LT
Compression test (LH bank 155-165 RH 145-155)
Different (spare) ECU
After doing all this the missfire is worse on LPG (its like a fluff on petrol and a miss on LPG) so leading me to HT electrics
Looked at in dark tonight and there was tracking from coil lead so re routed (no tracking but no better)
Also noticed tracking coming from either - end of plug cap or base of Spark plug on 2 cylinders but not every cycle
Anyone see this before whats causing it?
:( :( :( :( :( :(
gtomo2:
Got the same thing on my disco running lpg. Close your plug gap to .8. and clean the contacts in the dissy then run for a bit and re check the dissy i found that the dissy on mine was warped and was missing the rear pin out you will be able to see which one is missing if its the dissy as it will still be clean and the rest will have a black mark on them were the spark jumps from the rotor arm to the dissy pin. i fitted a new dissy and it still did it found the brand new dissy had warped as well. Best to use lucas dissy cap not a copy. if the dissy is ok check your ht leads are not touching or crossing as that can do it as well.
Range Rover Blues:
Don't fit hong-kong-fuey ingnition parts like rotor or cap, LPG takes a lot of igniting hence the closer gap, say 27 thou rather than 30 thou.
Henry Webster:
I went through some of this earlier on the year on a petrol only set up. The only point I would make is don't rely on SH parts to make a diagnosis.
I went right round the houses several times and then in the end threw another NEW set of leads at it and it runs fine!
Garth:
Well we now have NEW NGK BP6ES plugs at 0.8
NEW Lumenition 8mm Silicon Blue plug leads
New Lucas Coil
New Lucas Dizzy Cap
New Lucas rotor Arm
The misfire on tickover is worse and now missing midrange under load on PLG and petrol so what ever it is is getting worse
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