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.

EEC IV code help

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Old 05-11-2005, 04:46 AM
  #1  
ddillard77
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Default EEC IV code help

I have a 91 5.0, 5 speed. I am getting codes 51, 22. 23. 54. 34. 67. and 82.
Which represent ECT, MAP, TP, ACT, EGR, NSS, and TAB. I have tested the ECT and ACT and the problem that the book I am using, How to tune and modify ford fuel injection, says is wrong is the signal return wire. The book lists it as a black and white wire that connects to the ECU on pin 46. My wire is grey and red and tests good with a continuity tester. This started when my car fried its computer and I replaced with a refurbished ford A9L. Any suggestions would be appreciated.

73mm C&L MAF
70mm BBK throttle body
Trick Flow Street intake
Mac shorty headers
Mac Cold Air
Flex-a-Lite electric fan
Stock injectorsBBK adjustable fuel pressure regulator
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Old 05-11-2005, 07:39 PM
  #2  
90Mustangfan
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Default RE: EEC IV code help

check the salt and pepper connectors right behind the intake manifold...look up the salt and pepper connectors at yahoo and youll find a ting on fixing the connectors...likley that your problem because all those things cant be tweaked...well mabye if your car is really messed up...which I doubt
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