WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Topic: WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi (Read 1369 times) previous topic - next topic

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

January 02, 2015, 04:20:48 AM

Doing a '85 to '88 engine swop and need the usual wiring and box.

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #1 – January 02, 2015, 01:44:04 PM

88 is a unique wire harness, sure you want to go that route,,, 88 has its very own dedicated evtm as well.... minor differences but when your chasing down a wire color that is uniqe to one year only,, its a pain.
87 would be the better choice if I were you.

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #2 – January 02, 2015, 02:04:37 PM

87+88 are both different, just changing between them is not that easy. If your dead set doing efi, the best bet is get a harness for the 88. It's getting harder to find them, 1 year only. There could be a few here hording 1, That went carb.

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #3 – January 03, 2015, 06:49:56 PM

I was on the fence on between maintaining the SEFI intake on this motor swop or just going edelbrock performer intake and 4 barrel carb. The SEFI would be cheaper to keep and just replace my computer and harness. This also would be easy to maintain since the computer does many of the task to keep the car running at it's best. On the other hand, if I just remove all this above the heads and install the edelbrock intake and carb and new distributor with electronic ignition and AOD linkage, I can just go and do anything I want to keep the engine without fear of setting the computer into hunting mode. I know there are just an incredible amount of directions to go on building and I just don't want to get caught up having to chase the constant bottle necks of power restrictions. I want to just get this 88 motor in with a few mods and stuff (car is 100% smog exempt) and then get the rest of the car painted and rolling on the road. Parts are tough to find I agree and the wiring that this 88 motor came from was molested from the car at the yard, but our yards we have here are probably the biggest in the country and get a good flow of inventory with one having over 1350 vehicles. Family owned 2 yards and 2 1988 TBirds right now in them. One being the motor doner for my 88 engine.
I am going to keep my feelers out for these items and appreciate very much for all your feedback on this. Having this older TBird for my first American car and v8 car is definitely a fun experience so far. The great help with advise is what keeps it going too.
Hey Kitz, how do like those magnaflow's sound on your car with the cam? Nice car also by the way.

The wife wants these colors and probably will get her way since the car is for her

, but I like this scheme and will probably only get to imagine it.

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #4 – January 04, 2015, 01:09:47 PM

I do have an 88 harness, gets you from the computer out to the engine. (eec & engine harness)
the fuse box harness is a different story,, seems this harness Is hard wired home run from the fuse panel out to the lights ect.

85 was CFI, pretty dependable if you ask me,,, two blue top 54lb injectors was all it took to mirror the carb rendition.
you could keep the simple system you have with way much less headaches as the sefi and delete the air cleaner in trade for a cool looking "hood" or "hat" that goes over the CFI,,,(aka TBI by chevy).

furthermore, the fuel pres reg has a plug in the top, if its metal then drill and pop it out. if its plastic then its not oem but..........
once the plug is out, it reveals an allen head screw. turning the screw clockwise increases fuel pres.

the old cfi systems are not bad at all.... and can operate with very little external influences to cause the car to not run.

GT heads and a better intake , then you can hone out your CFI, add larger butterflies, then increase the fuel pres and your doing larger dual exhaust.

to me the CFI systems are very very simplistic and wont have all the fickle problems the sefi cars or Mass Air systems have.

I think you can even swap in some larger injectors,,, they just need to be high resistance injectors (high impedance).

its your call though.

besides, if you keep it cfi, you can also do my heater core mod and not have the problems of taking off the throttle body on an SEFI setup to pull it out the fire wall.

I think I paid 250 for the harness I mentioned earlier, its a spare for my son's 88bird

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #5 – January 04, 2015, 05:49:54 PM

That is a great idea jcassity, Thanks

Quote from: jcassity;442446

I do have an 88 harness, gets you from the computer out to the engine. (eec & engine harness)
the fuse box harness is a different story,, seems this harness Is hard wired home run from the fuse panel out to the lights ect.

85 was CFI, pretty dependable if you ask me,,, two blue top 54lb injectors was all it took to mirror the carb rendition.
you could keep the simple system you have with way much less headaches as the sefi and delete the air cleaner in trade for a cool looking "hood" or "hat" that goes over the CFI,,,(aka TBI by chevy).

furthermore, the fuel pres reg has a plug in the top, if its metal then drill and pop it out. if its plastic then its not oem but..........
once the plug is out, it reveals an allen head screw. turning the screw clockwise increases fuel pres.

the old cfi systems are not bad at all.... and can operate with very little external influences to cause the car to not run.

GT heads and a better intake , then you can hone out your CFI, add larger butterflies, then increase the fuel pres and your doing larger dual exhaust.

to me the CFI systems are very very simplistic and wont have all the fickle problems the sefi cars or Mass Air systems have.

I think you can even swap in some larger injectors,,, they just need to be high resistance injectors (high impedance).

its your call though.

besides, if you keep it cfi, you can also do my heater core mod and not have the problems of taking off the throttle body on an SEFI setup to pull it out the fire wall.

I think I paid 250 for the harness I mentioned earlier, its a spare for my son's 88bird

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #6 – January 04, 2015, 06:31:43 PM

Quote from: jcassity;442446

to me the CFI systems are very very simplistic and wont have all the fickle problems the sefi cars or Mass Air systems have.

In 1985 I believe they also lack adaptive strategy, meaning if you lose a sensor; you're boned..... The adaptive strategy/FMEM in the SEFI EEC-IV is actually fairly competent and you can work around/without a lot of the components if wanted/needed.

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #7 – January 05, 2015, 08:12:38 PM

to run (like or run sorta ok,,) the cfi needs the dizzy parts & tps & the mechanical stuff functional like FPR and Fuel pump

add a good map and 0'2 sensors and it runs very well

the EGR and emissions solenoids behind the coolant fill tank are extra,,,

personally I dislike the huge intakes we have atop our 5.0's & 5.8's,, much rather have some of the mods toohighpsi.com guys make or hand fabricate.

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #8 – January 06, 2015, 05:19:37 AM

I missed the part where your putting the 88 in a 85, I'm not familiar with the 85, Like Scott said it won't be easy to wire to the car for the I/P an fuse box. For what your doing a 87 Harness would work also. You will have to figure the wiring out to the car.
I like the magnaflows.

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #9 – January 10, 2015, 02:09:41 AM

NOTE to ADMIN ---> THIS THREAD CAN BE CLOSED

Couldn't locate the lock thread link anywhere so I could close it from further posting.
Anyway, I decided to swop to carb on this 100% smog test exempt car and have ordered parts for the build. So in about a week it will be like X-Mas here again as delivery trucks start dropping off my stuff. I have a couple things I need from our wrecking yard for the build that should be easy to find.

duraspark distributor

WANTED - Wire harness + EEC + MAS for Tbird 5.0 sefi

Reply #10 – January 24, 2015, 07:01:08 PM

Just wanted to say to OP, I have an engine harness from an '88 that is unmodified and ready to go. My dash harnesses however have been worked on and thus are unfit for human consumption.

Irrelevant since you've decided to go to a carb, but to do the swap to sefi, all you'd need is the engine harness, EEC, dash harness, and of course the efi engine, or else all the parts and sensors to convert your engine.

Good luck :)