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ripperdog · 11-28-2004, 10:34 PM

I need some help from someone experienced at trouble shooting EEC-IV systems. Some time ago I swopped a EEC-IV system in to my '85 Mustang GT convertible and have never been able to work-out all the bugs.

The car starts and runs but exhibits all kinds of drivability issues including a wandering idle and difficult warm engine starting. It will almost always show a check engine light after running for a short period of time.

When performing a KOEO test the following codes are indicated: 67, 85, 22, 34, 51, 53, 54

All the sensors, switches and actuators that are producing fault codes check-out O.k (with the exception of the cannister purge solenoid). The EEC-IV computer is from the Ford Cobra mass air conversion kit (includes mass air meter & 24 lb injectors). The main wire harness was sourced from a Mustang specialist junk yard. I requested a harness from a '91 model to match the engine harness, but who knows what they actually sent me?

I suspect a problem with the main wire harness but would like to solicit a second opinion before removing it. Pulling that damn dashboard back apart in order to remove the harness is my worst nightmare! Someone Please Help!!!

11-28-2004, 10:34 PM	#1
ripperdog Registered Member Join Date: Nov 2004 Posts: 5	Need an EFI tech! I need some help from someone experienced at trouble shooting EEC-IV systems. Some time ago I swopped a EEC-IV system in to my '85 Mustang GT convertible and have never been able to work-out all the bugs. The car starts and runs but exhibits all kinds of drivability issues including a wandering idle and difficult warm engine starting. It will almost always show a check engine light after running for a short period of time. When performing a KOEO test the following codes are indicated: 67, 85, 22, 34, 51, 53, 54 All the sensors, switches and actuators that are producing fault codes check-out O.k (with the exception of the cannister purge solenoid). The EEC-IV computer is from the Ford Cobra mass air conversion kit (includes mass air meter & 24 lb injectors). The main wire harness was sourced from a Mustang specialist junk yard. I requested a harness from a '91 model to match the engine harness, but who knows what they actually sent me? I suspect a problem with the main wire harness but would like to solicit a second opinion before removing it. Pulling that damn dashboard back apart in order to remove the harness is my worst nightmare! Someone Please Help!!!