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Discussing running really rich in the 5.0 Mustangs Forum. i have a 90 fox with a little bit of things done and wondering why ...

       

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Old September 30th, 2007, 09:46 PM   #1
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running really rich


i have a 90 fox with a little bit of things done and wondering why it is running so rich and also why in the morning it pops and backfires through the intake but once warms up runs fine.
 

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Old September 30th, 2007, 09:47 PM   #2
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do you have an adjustable fuel pressure regulator?

What is your setup? I assume it is fuel injected right? You say a few things done to it, what size injectors are you running?
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Originally Posted by White99stang View Post
Its getting kinda late so i am sorry for the language guys, i need to watch what i say.
 
Old September 30th, 2007, 10:06 PM   #3
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Check codes, maybe time to check the timing and O2 sensors, clean the MAF.
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Old September 30th, 2007, 11:39 PM   #4
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i had the same exact thing wrong almost identical, its the timing big time. after i got my head job the timing was set at about 6* and needed to be set at 12*, fixed it right up.
 
Old October 5th, 2007, 07:30 PM   #5
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problems


yea check your o2's, and mabey idle air control? and your codes.
 
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