5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

I need all the help i can get from the fuel injection pros

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Old 06-11-2013, 02:57 PM
  #11  
big ben
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alright I just got off the phone with bbk and he said the maf is calibrated for 19# so I just need somebody to confirm that I have 30# injectors and that this setup would realy make me run this rich
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Old 06-11-2013, 03:19 PM
  #12  
mattdel
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Those injectors look like 19 to me, and if the MAF is 19, then you're good on that regard.
On the other hand, a cobra computer is expecting 24#, and I'm not too sure it would play nice with 19's, calib'd MAF or not.
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Old 06-11-2013, 03:44 PM
  #13  
big ben
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I just got ahold of the PO he said they are 19# venum injectors.. the maf is for 19#... so im back to maybe the fpr?
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Old 06-11-2013, 09:57 PM
  #14  
mattdel
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Maybe. If the pressure is good I'd look into finding a normal computer. I honestly think there's a conflict there. Cobra computers are calibrated for 24 right out of the box and it's not a normal thing to go backwards in regards to such.
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Old 06-12-2013, 03:10 PM
  #15  
big ben
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I checked my fuel pressure with the FPR with vac unhooked, I have a constant 40lbs no matter what the rpms are. with the vac plugged in I have 38lbs at idle and it drops when I hit the gas down to about 26-28lbs at wot.
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Old 06-12-2013, 04:32 PM
  #16  
mattdel
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Seems to be functioning backwards. No good. Should be 32 with vac on, 38 without. Should also go from 32 to 38 with more throttle.
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Old 06-14-2013, 08:03 PM
  #17  
big ben
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im going nuts I just changed the fpr and the comp and nothing still rich....crazy rich... I now have 38 lbs of fuel pressure at idle and 40lbs when reved.. when I took the upper intake off I noticed fuel on the gasket in between the rear 4 intake ports (GT40 intake with a 1 inch spacer) so I got 2 new gaskets. also noticed a little bit of carbon in those same ports. when i drove the car the other day it would pop (through the intake?) when shifting after gettin into it...im starting to think theres a bad vacuum leak somewhere i haven't seen or cant get to...i sprayed the spacer and gaskets with break clean when it was running so its not leaking externally maybe a cracked intake, head or leaking lower gasket into the lifter valley? idk where to go from here or how to diagnose internal lower intake leaks?
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Old 06-15-2013, 02:13 AM
  #18  
mattdel
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Smoke machine
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Old 06-16-2013, 01:36 PM
  #19  
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Originally Posted by mattdel
Smoke machine
Or a spray bottle. Either way should help tell you where it is
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