shaun69 Posted March 9, 2009 Share Posted March 9, 2009 Can some one please HELP My Disco sounds like it is only running on 7 cylinnders and when under a load it pings like a pig. It is running on LPG the engine has done 84k and strats 1st thing in the morning A1, and when warm. I have chaqhed the timeing (dissy), New spark plugs, New leads, New cap and arm and coil. I am startting to think that it is internal, IE valve or cylinder. I would like to do a pressher chaeqe but do not have the tool. Any iders Quote Link to comment Share on other sites More sharing options...
pw8757 Posted March 10, 2009 Share Posted March 10, 2009 You may want to check that the vacuum advance/retard is working properly. Mine failed recently and resulted in pinking. A simple check is to remove the Dizzy cap and the end of the tube from the air inlet end. Then suck on the tube whilst looking at the rotor mechanism, which should move slightly anti-clockwise. If it doesn't, then the vacuum membrane has split. If this is the case, just change the vacuum unit. Bear in mind that LPG burns slower than petrol and you may wish to allow a couple of extra degrees BTDC when setting up your timing. Mine is presently set at 6.9 degrees. Hope this helps............... Quote Link to comment Share on other sites More sharing options...
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