To your 351 question, yes the 5L upper will fit the 351 lower EFI manifold as long as the port mating shapes are the same. Also some larger cars have upper manifolds that have their throttle body inlet on the drivers side, should that be of any interest. ....................................................................................................... For the ignition switch,there is so much being said here that confusion is setting in. The EEC is powered thu a relay from battery and not directly from the ignition switch. The ignition switch only has the EEC relay, the starter solenoid and the TFI to power, in general. That's not a lot of current. The start solenoid is the only added draw until the engine starts. There are several cars or more here that have been EFI for a number of years.
The EEC is powered thu a relay from battery and not directly from the ignition switch. The ignition switch only has the EEC relay, the starter solenoid and the TFI to power, in general. That's not a lot of current. The start solenoid is the only added draw until the engine starts. So thats what that relay is for! I remember, onthe t-bird, turn the key on, that relay would kick on for about 3 seconds, and shut off,,, It was located on the passenger side, right beside #1 spark plug, on the fender. Yeah, I know its confusing. I appreciate your input! Its better than gold! chad
The relay your talking of operating and releasing is not the EEC relay. It's for the fuel pump circuit, but is operated by the EEC, from the inital power up pulse recieved from pin 22 of the EEC.. The EEC relay has to operate and stay operated for the system to start the engine. The EEC fires the injectors in sequeince or batch fire and sends the control signals (according to the fire order in the program) to the TFI with timing lead added, to fire the ignition coil. Re-visit the fuel injection site and look at the diagrams. These two different relays are shown.
I got to looking around, and I have not found the EEC relay. I did find a plug, that has the color coded, but no relay was on it,, It was right next to the computer in the foot panel. I looked over the car too, could not find anything. I checked NAPA .com to find a new one,, well, they only show a 3.8LV6, and its not the same as the plug I have,, nor, did they list one for a 5.0. Should I get one from a 89 mustang? This dont make sence,,, CHad
A search of online auto parts sites shows that no one lists the EEC power relays. Suggest you go to a Ford dealer and ask them to look up the number for the year harness you are using or get a relay from a yard car. It should be located near the EEC location inside the car..
I talked to 3 different FORD dealerships today, there is no EEC power relay in the 88 t-bird with a 5.0 sefi engine. I ripped out every wire in that car, I found 3 relays, ford said they were a horn relay, (X2) and a low oil relay, for a total of 5 relays on the car. Fuel pump, (in trunk) horn relay, (under dash) low oil relay, (under dash) last but not least, the relay under the hood. I did not ID this relay, But I think its for the AC,, could be wrong though,,, Now, what in the world is going on here???? Am I searching for a ghost? I know the newer Mustangs have em, but, my t-bird does not. Now, the 88 t-bird with a 3.8L V6 has em, but not on a 5.0. So if thats the case,,, Do i even need it? Apparently it did not from the factory,,, :confused: ChadS
I will check with my parts man to see what he comes up with for a part number. For those who have the Fuel Injection book by Probst, check page 336 drawing for the 88 T- Bird and Cougar 5.0L Map-SFI EEC. All the drawings for 5L engines show EEC power relays. On this drawing, the power relay and the fuel pump relay is close to the battery as well as the WAC relay to cut out the A/C, so it all is easy to see. The EEC power relay connects power to pin 37/57 of the EEC as well as powers the speed control bypass, EVR, CANP, TAB 1, TAB2 and all the injector 12 volt feeds.
Please let me know what the part number is, if you would be so kind! Never found it on my t-bird, now, it is a thunderbird sport,, does that make any difference?? Can I use any of the other relays I found in its place? I have one, that is a 4 prong, and 2 that is a 5 prong. The 4 prong is a lighter duty,,, I found something under the dash, right beside the light switch,,, struck me interesting,, its a small box, that contains a circuit board, that has a long white plug, and the wires are in a straight line,, also, under the dash on the drivers side, there is a larger white box,,, that has alot of wires in it,, any ideas? I have part numbers,, Chad
Here is the info, where to find the info and where to get a relay. The designation is DY-865. Ford part F9PZ-14N135-BA as looked up by my Ford parts dept. contact. Type in your browser bar 'auto relay DY-865'. The first source is ROCK AUTO in N.J. at $14.21 + shipping. I'm sure there are many more. I had this relay in my hand and it has a skirt below the contact lugs that the harness plugs into and allows it to hang free off the harness. The relay is located with the computer behind the passenger kick panel. Put check in mail please. I'm like a lawyer 100$ for the service and 50 cents for the part. Good luck.
Put check in mail please. I'm like a lawyer 100$ for the service and 50 cents for the part. Good luck.[/QUOTE] Well sir, all I can say is thank you kindly. And one good deed, deserves another. You have provided me with some valuable information. So here, I offer my services to you!! I build stroker engines everyday. From the ground up Out here in the country,, I build stroker engines for antique tractor pullers. I can do one heck of a job on a stroker crank for a small block/big block ford. Ill build you one anyday of the week. Cheaper than you can have em built, or buy. So if your in the market for a stroker crank, give a hollar at me. Thats the least,I can do. ChadS
Update!! Tonight, I finished up the wiring harness. Bluegrass, I bypassed the eec relay for now till I get one, I have a spare, complete sefi off another duplicate 88 t-bird,, sitting on the kitchen table. I have a 14 volt power inverter, I hooked everything up, and she works!!! Its hard to explain what I got sitting on the table, but just picture everything, distibutor, coil, sefi manifold and plentum, computer and the harness hooked up this power inverter. I even have a bulb for the check engine light, and a bulb to represent the fuel pump running. I hook up the power, just like turning on the key, the fuel pump light lights up for a moment, turns off, and then I spin the distributor to simulate the engine rotating. The injectors fire, and the ign coil fires the plugs! check engine light even goes out till the distributor stops spinning. All the sensors are hooked up right there on the table, like a bench test,, do you think I could run a code scan right there on the table? Chad
Incredible. "Please pass the salt and distributor." Sounds like you're almost there. (BTW, you just gotta take a picture of the harness in it's current state)
Chad, your a pistol! Iamgine that; it works like I had discribed. You must be the first one to ever do what you just did. Quite an education- no? Great work to show others how it really works. Now you can teach FI to the rest. Now for fun, read for any stored codes in the EEC, for the missing sensors and hardware.. I saw you message notification come up while i'm on another board. Cheers.
I dont think I could have done this without the help from people that know what they are doing. I doubt, Im the only one who has done this,, LOL! Its a education all right!! Im going to put that eec relay in,, that way it gets the proper power distribution,, but so far,, I have a KA power wire,, thats the memory wire that is hooked to constant power,, the fuel injector power circuit, is actually thru the ignition,, the rest is pretty much self explanitory to the wiring diagrams. JUST LIKE YOU DESCRIBED!! Im just glad, when I hooked up the power, and turned the inverter on,, smoke did not rise from the table!! HAHAHA!!! My wife seen what I was up to,,, and when that coil snapped,,, she jumped back bout 3 feet! I got 2 days to get it off the table now,,, Chad
