Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Holley off idle backfire problem
View Single Post
  #37 (permalink)  
Old 05-28-2013, 06:57 PM
eric32 eric32 is offline
Registered User
 
Last photo:
Join Date: May 2008
Location: ohio
Posts: 1,406
Wiki Edits: 0

Thanks: 27
Thanked 41 Times in 38 Posts
Hey guys the mystery has been solved. Turns out it was a combo of initial timing and vacuum advance conflicting each other. Was running 14-16 initial with the 14 degrees of vacuum advance on full manifold. Putting vacuum advance on ported did not help at first but adding more initial with full manifold vacuum advance did not help. But initial was put to 17-18 and vacuum advance was then put to ported and wow what a difference. It runs like fuel injection and no more backfire. For some reason just that little difference made all the difference. Tried the different settings of timing before and could not cure it. But I did not figure this combo of just a few degrees and hooking vacuum advance to ported would make a world of difference. Something what works for one does not work for the other. Hard to read timing with new power steering bracket in road and was off about 4 degrees of timing. Thanks guys for your tips.
Reply With Quote