This is topic back fire on my 86 gt in forum Tech Talk at Northern California Ford Owners  .


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Posted by ONEQKFIVE0 (Member # 1591) on :
 
here's my set up... dss 306 short block rpm heads cane 1.7 rockers trickflow heat intake 70tb with egr stock 19 pound injectors msd 6al ok i been timming it 12 to 13 but it back fire at 4200 rpm i might just time it to stock 10 what you guys think
 

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Posted by FasterDamnit (Member # 442) on :
 
Cam?
Fuel Pressure?
 

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Posted by ONEQKFIVE0 (Member # 1591) on :
 
b cam and 255 fuel pump what do you think
 

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Posted by ONEQKFIVE0 (Member # 1591) on :
 
my fp is 52psi
 

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Posted by FasterDamnit (Member # 442) on :
 
Why 52? Try 4 psi less, then carefully drive it and see if it pings.
 

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Posted by ONEQKFIVE0 (Member # 1591) on :
 
say 46 to 48psi what about timing
 

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Posted by FasterDamnit (Member # 442) on :
 
12 should be fine.

The point is to change one thing and see what it does. If you drop fuel pressure and it gets worse, you may need to go the other way. But I bet you are rich.
 

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Posted by FasterDamnit (Member # 442) on :
 
Oh
Mass air???? I hope so. The SD will not behave well w/ the b cam.
 

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Posted by ONEQKFIVE0 (Member # 1591) on :
 
im running cl 73 air mass & conversion kit from CL
 

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Posted by DropTopFox (Member # 1689) on :
 
get it tuned by a pro
 

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Posted by FasterDamnit (Member # 442) on :
 

quote:

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Originally posted by DropTopFox:
get it tuned by a pro

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Why? It is a very mild combo.
 

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Posted by 88gt (Member # 579) on :
 
Where are you hearing the backfire? Is it from the intake or exhaust?
 

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Posted by ONEQKFIVE0 (Member # 1591) on :
 
from the intake damn
 

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Posted by 88gt (Member # 579) on :
 
Usually intake backfires means you are running lean.
 

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