Have 86 merc donor 5.0 efi . Need to know what vacume controls are needed to transfer.Also can smog stuff be taken off eazily.86 first year for thottle body on 5.0s?

 

My son had an '85 TBird with CFI (Central Fuel Injection? my son called it Crappy Fuel Injection) which was a throttle body system (2-bbl). Is this like a free car? Honestly, it is a bad system!! No EFI diagnostics, tons of relays and tubing for EGR and other functions, and it needs all of them to run right unless you want to run open-loop all the time (bad mileage). The '88-up 5.0 with multi-port "true" EFI, is a much better choice, and probably less effort (wiring and tubing). The CFI version was only rated at 125 HP too, compared to 180 for the first MPFI 5.0 GT-style engines (200 by '93, I think). But if you've got the CFI for free...

 

You could pull all the EFI junk off and go with a carb. Seen it done on Mustangs. That way you could get rid of the smog stuff too.

Bob
60 F100
95 F150

 

Hi lt56,

I scrapped everything smog related when I dropped my '92 LSC motor into my '53. The only vacuum that I'm using comes off of the plenum and is for the brake booster, fuel pressure regulator, and the EGR (which you don't need). Some helpful sites for your swap are:

www.fordfuelinjection.com
www.veryuseful.com/mustang/tech/engine/

Good luck and let me know if you need any help. - Brad

 

I'm running a 5.0 from an 89 F-150 (Speed Density EFI). I know it’s not the best choice, but the price was right and the engine was new. Your's may have the Mass-Air system which is preffered because it allows for adjustments when adding performance products such as a cam.

I pulled the complete under hood wiring harness, as well as the computer module, the inside harness and the wires feeding the fuel pumps and taillights. In setting everything up, I did remove the smog pump and the EGR system.

Setting up the stock fuel system was the hardest part of the project. I used the 'in-tank' low-pressure pump, as well as the frame mounted high-pressure pump, had to route the high-pressure fuel lines to the fuel reservoir, filter and finally the fuel rail. The return line from the other end of the fuel rail had to be routed back to the fuel reservoir and then back to the tank. I also had to cut a hole in the top of my fuel tank and install the in-tank pump, filter and float valve from the donar truck. No picnic!

It runs and sounds great now, worth the trouble in the long run, I have it coupled to an AOD so the mileage should be acceptable.

 

Have you read:

https://www.ford-trucks.com/article/...250_Truck.html

?

 

The generally accepted wisdom is to go to a later -read after '88- SEFI 5.0L, however not knowing this, I came accross a great deal on an '86 Lincoln MKVII with 5.0L/AOD set up and used the entire driveline including drive shaft that worked just great with the addition of a 1" spacer!
The '86 SEFI - Sequential Electronic Fuel Injection - is Speed Density as opposed to the more sought after -read modifiable- Mass Air Flow system of '88 up I believe.

Any ways, I deleted the smog pump and my is working fine... [in a nod to my environmental conscience I added two catalytic converters and ran dual exhaust pipes to separate resonators].

This site and the fellow who runs it was particularly helpful to me: [http://fordfuelinjection.com/]

GW

 

I have the whole car for parts .puting in 56 pick up.Close to free as you can get.Suposedly only 30,000 mi on trany(aod) and motor.

 

It56,
ALthough my '86 Lincoln MKVII, 5.0L has a throttle body, it is actually a true SEFI engine with independant injecotors for each cylinder and a fuel rail and return loop to the tank supplying them with continuous pressure and the ECM IV [Electronic Control Module, 4th evolution]. Lincoln often introduced new technologies, so may have been ahead of your Mercury, not sure about that. I'd suggest checking the resources already suggested above b4 starting the cannibalization process on your doner.

Even if it isn't a SEFI, it is possible with patience and methodical effort to transplant a SEFI system from another wrecker since you have a good doner engine and tranny.

You definitely need the ECM IV computer or "Brain" and the complete wiring and vacuum line harness if it is a SEFI/ECM IV system. Think of it as harvesting an organ with all the connective veins, arteries and connective tissue.

I am no expert, just patient and determined, so if you have these qualities and the desire...go for it!
You want to invest in a Haynes or Chilton[even better] manual on your model if you get the answers you want on the type of fuel injection.

[http://fordfuelinjection.com/] has some great pictures and step by step plans I downloaded in my project.

The ECM Computer controler without which the system is useless, is "usually" inside the vehicle for protection and on the passenger side behind the kick panel or glove box area. Check the manual! Look inside your Merc for where the harness enters the passenger compartment through the firewall, harvest everything carefully taking the grommet for later use as well. You'll delete wires from the harness later since you are deleting your smog. You'll have to plug the smog tube on the back of the engine.

[I've been wondering if removing the smog pump is what's causing my engine to run rich...I have black carbon at the tailpipe... could be O2 sensors tho]

Hope this was helpful.

GW

 

The Ford CFI was used 83-85 on the Crown Victoria, Towncar, Grand Marquis, Cougar, Thunderbirds etc with the V-6 and V-8. It was also used on the 84-85 Mustang 302. In 85 Ford went to the speed density on the trucks and 86 on the cars. Mass Air was 88 in California and 89 up mustangs, highend lincolns. In 90 I think they had it in the Cougars, Towncars, Grand Marquis and Thunderbirds. The trucks had speed density up to 94.