efi265 Posted February 20, 2016 Report Share Posted February 20, 2016 Hi guys my car has started to run lean all of a sudden and cant figure out why Would valve lash do this the tune hasnt changed I Did alter the idle screw to lower idle which would make u think less air rather than more air . idle is set to open loop with idle stepper I have not changed the lash either Quote Link to comment Share on other sites More sharing options...
Simon Posted February 21, 2016 Report Share Posted February 21, 2016 If tune is the same then you are looking for anything outside the ECU that can effect the amount of fuel getting to the engine.Fuel pressure and flow, Injector flow fuel rail blockages etc. Quote Link to comment Share on other sites More sharing options...
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