galantcolt Posted February 13, 2011 Share Posted February 13, 2011 Hi , I have recently bought a 1973 GTO 2000GS with 4G52 motor. Most work allready done, But goes great till 4000rpm then missies and gags. Fuel vent clear, fuel filter clear. Will rev thru when parked , but under load just appears to either run out of fuel or spark? Can anybody help cheers Quote Link to comment Share on other sites More sharing options...
peteretep Posted February 13, 2011 Share Posted February 13, 2011 Clean the carb? Quote Link to comment Share on other sites More sharing options...
fuel Posted February 13, 2011 Share Posted February 13, 2011 how is the condition of the points, dizzy cap, rotor, spark plugs and spark leads? the spark could be breaking down under load. Quote Link to comment Share on other sites More sharing options...
johnnyfive Posted February 13, 2011 Share Posted February 13, 2011 Fuel filter clear? Clear of blockages? Clear of fuel? Quote Link to comment Share on other sites More sharing options...
galantcolt Posted February 13, 2011 Author Share Posted February 13, 2011 Yep done all that , new coil, new plugs new leads, new fuel filter Quote Link to comment Share on other sites More sharing options...
peteretep Posted February 13, 2011 Share Posted February 13, 2011 but did you check inside the carb? theyre pretty easy to open up and have a look at Quote Link to comment Share on other sites More sharing options...
galantcolt Posted February 13, 2011 Author Share Posted February 13, 2011 yep , carb just rebuilt and balanced. Thinking it may be electrical Quote Link to comment Share on other sites More sharing options...
dwlee Posted February 14, 2011 Share Posted February 14, 2011 Are the vacuum secondaries opening? Have you checked that the electric fuel pump is supplying enough fuel? Is the pickup in the tank clean of rubbish? Is the distributor cap and rotor in good condition? Quote Link to comment Share on other sites More sharing options...
galantcolt Posted February 14, 2011 Author Share Posted February 14, 2011 Hi , All electrical new. Flow from Pump appears good , but i dont know what volume is required. Quote Link to comment Share on other sites More sharing options...
efp0wa Posted February 14, 2011 Share Posted February 14, 2011 Vacuum advance on distributor possibly? Or ignition timing out? Quote Link to comment Share on other sites More sharing options...
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