Ok, so after an effin' long hiatus, I've decided to do something with the gen 3.1.
I have a Ford 4.9L (300ci)in a 1978 Truck, and wanting to do away with the single barrel carb. Ford has made this engine up to 1996, and introduced EFI around '87. The engine is shot, bad rings, valve train noisy (maybe the crank?)... so located an 88 EFI 4.9L and will use it as the base for VEMS.
Idea is to be able to modify this engine (Cam, Exhaust, Turbo, etc... fun stuff ;) and have the EFI controller roll with the changes. I'll be doing this in steps, firstly get VEMS working with what's on the 4.9L and introduce enhancements later.
Stage one:
1. Inventory what I gots:
-I have a 1996 Distributor with a Hall Sensor in it, and 6 tooth wheel and trigger vane is smaller than the rest. more infohttp://oldfuelinjection.com/?p=25
-2x GM MAP sensors (1 for dynamic Barometric Pressure Correction). Going to gut one, and place the 2.5 BAR MAP sensor to bring it closer to the manifold.
-Coolant and intake temp sensors, with really high resistance, I may use the NTC temp resistors in them... or GM ones... not sure yet... More info: Coolant Temp http://oldfuelinjection.com/index.php?p=28 and Intake temp http://oldfuelinjection.com/index.php?p=29
-Ford 80mm MAF sensor pn: xl3f-12b579-ba I really want to use a MAF and not speed density, but not sure how I'm gonna incorporate it... AFAIK, most VEMS installs go with SpeedDensity. Meh, I'll wire it up, and decide later. More info: http://oldfuelinjection.com/?p=26
-Ford Stock 4.9L Knock Sensor http://oldfuelinjection.com/?p=34
-Ford Idle Air Control Valve PWM controlled. more info: http://oldfuelinjection.com/?p=39
-1996 Ford truck Power Distribution Box, to make things look neat.
-TPS, EGR, Fuel Vapour Canister purge, etc...
2. Build a schematic so I can build a Harness.
--My [
http://zark.homeserver.com/vems/Pieper%27s%20VEMS%20Schematic.vsd Schematic] in Microsoft Visio I made for learnin' ...
--Harness:
What the schematic doesn't show, which I'll hafta scan in, is the Hand draw notes on my Harness build plans. There are three major sections to it:
1. Modified Original. The EFI truck, I sourced this stuff from came to the local dump, which allows us 'scavengers' access to, had the cab with the computer already crushed, and grabbed the rest. so, I have the Injectors harness, TPS area, and Ignition Area harness. I pulled all the pins out and stripped the coverings to expose the wires within. and I found factory batch fired, two batches of three cylinders! Cheep...
2. VEMS harness - VEMS related wiring, connections to the Power Distribution Box, and Modified Original.
3. Power Distribution - Box and bracket taken from a 1996 EFI truck. Stripped of all wires, as in busted open the crimps and pulled the wires off. Doesn't look purdy when the harness has a million splices! re-crimps don't hold as well, and so are soldered.
4. Alternator Harness for [3Gen] [Alternator] [Upgrade] - Slightly modified to fit original ALT light.
![[Upgrade]](http://www.fordmuscleforums.com/attachments/truck-forum/13525d1278680229-3g-alternator-hook-up-84-f-150-truck-alt-3g-install-early.jpg){kind=link}
Now can upgrade to serpentine belts, and the 1996 Crankshaft Harmonic balancer with 3 finger misfire tone ring. Some ferd history: 1996 Ford Truck had to comply with some OBD2 compliance, and was only year for 4.9L with a crankshaft tone ring. This applies to other truck engines sold by ford in 1996 before the next gen 97 models and it's newer engines.
Next is to machine a wheel to replace the 3 fingered VR with a nice 36 missing tooth gear, which is Stage 2.
Been soldering the original 78 harness as I go as well, and gooping in dielectric compound, and will be slathered with some kinda white grease and then wrapped to keep the mess together... overkill? naw.. ;)
Stage Two:
-I have the 96 crank pulley with a 3 tooth vr sensor ford used for misfire. Plan is to remove the aluminum wheel, and add more standard missing tooth wheel (36-1?) and replace VR with Hall Sensor.
- Really OLD:
I'm gonna Try and Install a Genboard 3.1 into a Jeep Cherokee (XJ) with a 4.2L I-6 Engine (swapping out the 2.8L GM V-6) and [a GM HEI Distributor Mod] and the older 4.0l (Non-HO) I-6 Intake manifold with Individual Fuel Injectors per Cyl.
My Todo List:
- Update this page with Pics after I get a small Home Web server Going...
- Install Engine into Cherokee and get it running with the Carb.
- Install GM HEI from a Inline GM 6-cyl Distributer
- See if the Intake Manifold will bolt up to the Older Engine
- Brainstorm a trigger wheel... and Install the Genboard as the Winter project. maybe a 36-1 trigger wheel made from a discarded uhm... GM Auto trasmission thingy (I found a web site with info, but lost it...)
- Help with the VEMS-Group Documentation
- Get the Genboard to talk to my computer via the RS232 port
Anybody know if High Z or Low Z Injectors are better for Cold Weather Operation? (-40C to -50C) as I live in the Sub-Arctic...