RickBrinker Posted July 23, 2008 Share Posted July 23, 2008 Why does my 29 DeSoto idle better with the idle mixture screw removed.It has a new Zenith 14991b Link to comment Share on other sites More sharing options...
carbking Posted July 24, 2008 Share Posted July 24, 2008 It shouldn't.Possible causes that I can think of:(A) low compression( if vacuum tank, then leaking vacuum valve© if electric pump, one with too much pressure.I am sure there are others.Jon. Link to comment Share on other sites More sharing options...
RickBrinker Posted July 24, 2008 Author Share Posted July 24, 2008 New engine,no vacuum tank,Yes electric fuel pump will try regulator what pressure should i get. Thanks Link to comment Share on other sites More sharing options...
carbking Posted July 24, 2008 Share Posted July 24, 2008 The 14991 will handle about 3.5 to 4 psi.The symptom appears to be telling us that the idle is WAY too rich; therefore removing the screw would allow air to enter the system and lean it out.You might also try turning the screw all the way in to see what results you obtain.Jon. Link to comment Share on other sites More sharing options...
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