speed density MAF

[TheLimeRanger]

i know this has been beat to death.......and i wanted to thank everyone for pointing me in the right direction. ive been doing ALOT of reading on the EFI swap. first things first.....i bought an '88 LSC as a donor. From what ive read the harness in this car is a bear to work with, so, for the sake of my own sanity, im not going to use it.

Does someone make a harness for the speed density setup? or am i going to have to convert to MAF to make this work? Im going to be running all stock, so as far as upgrades are concerned, well, im not concerned, i merely want Fuel Injection.

Im getting some conflicting reading. some articles that ive read make it seem like all i need is the MAF unit, a harness, and a computer in order to convert to MAF. but ive also read something about a different distributer, and an intake with some type of port in it?

obviously i have a long way to go, but ive got the donor, so ive taken the first step, now someone shove me!

thanks
Scott

 

[jurob]

intake and dist are the same between mass air and speed density.

which harness are you talking about? there is a engine harness and there is a eec harness. they plug into each other at the black and white connectors (salt and pepper) between the tb and upper intake (above fpr).

if you don't want to use the eec harness that you have, reuse the engine harness and o2 sensor and oil level (o2 and oil together) and buy this, http://store.summitracing.com/partd...-12071-C302&N=700+4294908331+115&autoview=sku

but you will have to use a mass air meter. this is the absolue simplest and cheapest way to go if you don't want to use your existing harness. this install is plug and play and the only wire i can think of that you will have to wire is for your fuel pump.

read this and this will help alot.

http://static.summitracing.com/global/images/instructions/fms-m12071f302.pdf

 

[TheLimeRanger]

what ive read about the LSC is that the harness' are very complex, and annoying to work with due to all of the extra electronic bells and whistles that are on the car. I know there is a harness that is more or less plug and play with the bronco, but it seems that its MAF. I want to know if i use the speed density setup, is there a plug and play harness that i could get my hands on?

 

[A4x4Junky]

I put the 302HO from a LSC into my Heep and used the harness from the Lincoln. Yep, it sucks. If you have patience and a bit of time it is doable. Just need to start at one end with a couple of wiring diagrams and begin removing wiring for air bag suspensions, lights, etc. I started at the 60pin connector and traced each wire to the other end. The pic I have shows the wiring that I used prior to wrapping it all pretty-like. I had to lengthen some wires, and cut others. It worked perfectly, so it is a cheap (but labor-intensive) way to get it done.

You might be able to get away with a harness from a FSB (88-94ish) with a 351. You will still need the wiring diagrams from both vehicles if you plan to use the Lincoln computer.

For what its worth, I wont go through the Lincoln wiring mess again. I picked up a 351L and a 89 Mustang computer and harnesses. I will go mass air and have to take virtually nothing apart.

Anthony

 

[TheLimeRanger]

its good to hear from someone who's been down this road before. so theoretically, i could take my lsc motor, get myself one of ryan's harness', a different computer, mass air sensor, and this should be relatively pain free?

 

[fordtrucks4ever]

If you are not accustomed to working with automotive electricals, no matter which way you go it will be a pain. I have 3 LSC motors with original looms. Trace out all of the ECM wires then eliminate the rest. Then remove the wires from ECM that are not required for the conversion. You end up with basically the same as wiring kit. Its not hard if you spend a while getting familar with what you are doing. Even the plug and play harnasses require some surgery to work.

 

[A4x4Junky]

its good to hear from someone who's been down this road before. so theoretically, i could take my lsc motor, get myself one of ryan's harness', a different computer, mass air sensor, and this should be relatively pain free?

I dont know what kind of instructions these kits come with, but like fordtrucks4ever said, if you arent used to this kind of work Im sure it will be a challenge.

My Heep was left Speed Density with the LSC comp. Since I had the whole donor car I had access to every sensor, relay, etc. Routing through the wiring was more time consuming than difficult. Most reading I have done mentions that if you dont ever plan for major modifications tha the speed density system is perfectly fine.

However, I believe you are right. One of those aftermarket harnesses, a mass air mustang comp (just be sure to research the years the harness vendor recommends, though 89-93 seems to be the usual year range) a mass air sensor and you should be albe to wire up the whole thing relatively easily.

I suppose it comes down to which you prefer. Spend the time, or spend the money.

Anthony

 

[TheLimeRanger]

All good points, and i appreciate the input. i must admit, the wiring is a bit daunting...the other stuff doesnt really concern me that much. for some reason, ive always been intimidated by wiring.........that's not to say im not up for a challenge, i just want it to work when im done! since im getting the whole car, i could give it a shot, and it wouldnt cost me anything extra. So, i hear this harness is pretty long yes?......where did you get the wiring diagrams? and was it difficult to figure out what you needed to do?

 

[fordtrucks4ever]

ON an LSC, locate the ecm on passanger kick panel. Its a PITA to remove the plug and pull thru the firewall. If you win that battle, just follow the complete wire loom which is about 1.5" in diameter. It wraps completely around the front of car and back to drivers side, then under to transmission. You will need to partially remove most of the grill assembly to safely retrieve harnass. No short cuts here and dont cut anything, unless positive it isnt part of the efi wiring. Try not to unplug anything from the motor at this time. Unbolt relays and components from body and leave plugged in to the loom. This huge bulk of wires is scarey at first. But after running down each wire from ecm to a sensor, switch or connector, you end up with a fairly small amount of loose wires that will connect into the existing Bronco loom. You need to read up in Ford Fuel Injection book or the website to get familar with what you are doing. All of these are basically the same as a Mustang donor, just pin locations are different on each ECM. You get familar with your ECM and it all makes sense when comapring to others. I spent the last four years trying to locate a gremlin in an `89 Bronco I have. The wiring is the same on this as any other donor vehicle. But instead of giving up on the problem, I gained a major understanding of how this setup works and how its basically the same as any other make of fuel injection. They all work on the same principles and have basically all of the same sensors and components. ONE BIG WORD OF CAUTION. DONT use any crimp style wire connectors. Use only existing plugs and solder all spliced wires together and cover with heatshrink.

 

[Big Del]

Where are you guys mounting the ecm and what does lsc stand for I have an 88 mercury with the 5.0 as a donor car if I go with maf you say it is plug and play what does it plug into if your car is set up for speed density. Not to steal a thread but I have been looking to start my fuel injection swap as well does the computer need a speed signal.