Ford EEC IV computer
 

This is a long way from Stock or Super Stock but I couldn't figure anywhere else to put this. I searched for EEC IV but found nothing. Looking for anyone that would be so kind and can answer some questions about the EEC IV computer. I was quite fond of the W/SA Ranger of Gerald Nivens so I bought a truck to fix as a driver and take a slow ride at the local 1/8 mile strip with no worry of breakage. The truck WAS a 1991 Ranger 2.3 five speed. I pulled the engine and went through it. I put in a small camshaft. The factory roller was 187@.050 with .360 lift, the replacement was 193@.050 with 407 lift. I was told by the cam grinder the computer could be affected by large duration changes affecting vacuum but couldn't read lift and this one had no issues with EFI. The fuel pump, Fuel pressure regulator, and injectors are new. I lucky and found a C-4 pinto bellhousing and put in a C-4 with a shift kit and a 10" converter from a 2000cc Ranger that will stall 1800-1900. The issue is some times the truck runs great (but still won't spin the tires on gravel lol) and on occasion it it will act like it is starving for fuel or maybe flooding. Sometimes when this happens matting the gas solved the issue telling me it is not a fuel starvation issue and the next time it doesn't. When driving on the interstate you can feel surging with inclines and declines (this also was with the stock cam and the auto). I assumed this was vacuum changes affecting the fuel pressure regulator and put on another with no improvement I just replaced the fuel filter that had one oil change on it and checked the contents of the old one no water or rust. I am ignorant to EFI and fuel injection but considered one of the rebuilt injectors might be sticking open on occasion?? My questions are:

1. Does this early of an ECM know or care that there is a auto and not a manual trans in the truck now?

2. Do the manual 2.3 and the auto 2.3 ECM's have different timing and fuel curves?

3. Could my ECM be going bad?

4. How much cam timing, compression and fuel can you add to the stock EEC IV and it still function normal?

Any help or insight is greatly appreciated, Don Jackson

Re: Ford EEC IV computer
 

Try some of these? https://www.bing.com/search?q=eec%20...logo=CT3210127

Or maybe https://forums.corral.net/forums/
Mustangs, but who knows?

Re: Ford EEC IV computer
 

How much manifold vacuum do you have? They will not run on low vacuum. Yes the programming is very different between the autos and automatics.The IAC will not compensate for the load when put in gear. The range sensor on the trans is what tells the computer to compensate for the load.

Kirk, 210-887-3331 if you want to talk.

Re: Ford EEC IV computer
 

If it still has one, unplug the EGR valve and make sure its closed.

Re: Ford EEC IV computer
 

Typically, stick cars have a much different spark advance curve. They normally have less spark advance at lower RPM, than the automatic cars, with the same engine. That is to prevent detonation/spark knock at low RPM, if in higher gears. Automatic cars have more timing where you would take off from a dead stop, because the torque converter slips enough below stall RPM, they can put more timing in them down there for good throttle response.
If you have the vin number for an automatic car with the same engine, and an auto, you might get a local Ford dealer Technition to flash it with the automatic vin & Calibration.
If you can find a guy like me, but that tunes Fords, that would be best. He could also shut off the EGR, Cat Cool-down mode, raise the rev limiter, Top Speed limiter, and alter the timing & WOT fueling for racing fuel, and turn the cooling fans on sooner.

Re: Ford EEC IV computer
 

215-257-3724. Leave a message for Bill.
This guy can help, just not sure he would burn a chip without having the vehicle in front of him.

Re: Ford EEC IV computer
 

If it’s Speed Density from the factory you cannot run a cam with a lot of duration- it drives them crazy- unless your under WOT. Speed Density is vacuum sensitive. You would need to either switch to
Mass Air or get a chip burned- Or go aftermarket EFI.

Re: Ford EEC IV computer
 

Do the Ford computers not have V.E. tables?
And, unless the Mass Air Flow sensor is small enough to restrict air flow, they are not a bad deal. If you understand them, they can certainly make the car more consistent and easier to dial.

Re: Ford EEC IV computer
 

Ditch the OEM and put in a Pimp from Stinger.
https://www.stinger-performance.com/universalparts.html

It is MegaSquirt based, replaces the OEM computer using the OEM connector with some minor re-pinning, and will do anything you can imagine. EXCELLENT support by Stinger. I just put one in my 85.5 SVO (turbo 2.3) and it was almost trivial. It will also autotune the fuel maps if you have a wideband O2 sensor. Stinger will supply a base map to get it running, autotune with some manual adjustments after that.

Re: Ford EEC IV computer
 

this^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!!!!!!!!

Re: Ford EEC IV computer
 

Guys I really appreciate the responses, I have helped my brother with his IHRA Super stocker with a Holley 650cfm 2bbl since the 1980's. and his NHRA GT SS with a Q-jet but when he went to EFI (Thank God the engine builder programs the car) I am only good for fuel or a converter or transmission swap lol. Due to Christmas, family time, and my profession as a paramedic (we don't get holidays) I have not had the hood up on the ranger to check vacuum, fuel pressure, block off the EGR, or give Kirk a call. While at work I did look at the ECM and it has a catch code of MOM2. When I googled this I got a hit on a ranger with a 3.0?? Maybe bad info or maybe mine had been reflashed and replaced. After Ed's comment on timing in courious about a Auto ECM. I think the 1991 ranger still used the A4LD automatic and I know it has a lockup clutch, other than that I think it is a "dumb" transmission don't rely on the computer to function, it may work with the c-4 transmission. I have done some research on the Quarter Horse chip and for my application it appeared it may be the best bang for the buck as I am looking drivability, fuel economy and performance vs max H.P. and E.T. Heck if the Automatic 2.3 ECM works and get some fuel mileage I'd be happy. If the current 15 mpg is all I can get with the 2.3 with a cam upgrade I might as well look for a 260, 289 or 302 with a distributor and a carb and stuff it in lol. Thanks again for the replys and happy new year. Don Jackson

Re: Ford EEC IV computer
 

Hi Don. Correct, MOM2 is a California calibration for a 1996 Ranger 3.0 with a 4R44E trans. Hardware type will also be on the PCM decal, which is ML2-111. Same hardware also used in 96 for 4.0 Rangers with 4R55E trans, with a different calibration of course.

EDIT: Was really pondering how it could even run at all and why someone would have rewired the truck for that EEC-V module anyway. Now I see what it is, it's M0M2 rather than MOM2. That one is EEC-IV, for a Ranger 2.3, manual trans. So it's not flashable, no EEC-IV is, the only things you can use are those that connect to the service port on that PCM like plug in chips or there have been a couple of user editable devices that plug into that port also.

Going back and looking at your original post, a mechanical fuel pressure regulator with manifold reference like that doesn't do anything other than maintain the pressure delta between the rail and manifold, so no concerns there with a camshaft change. Really need some datalogs, but I don't know if any of the aftermarket software even has anything defined for that old and obscure application. Can maybe get some basic readings with some of the generic stuff out there, might show MAF, fuel trim, and what the oxygen sensor is doing at cruise/idle anyway. I would expect problems like dying when dropping it into gear or coming back to idle after a significant enough cam change, but you're right, you didn't change it much. Have you cleaned the MAF? Ford PCMs very rarely go bad.

Re: Ford EEC IV computer
 

Hi. I have a number of brand new computers for rangers and bronco II's of this era. If you can come up with a number you need I can check my stock (I probably have one). I have late 80's and early 90's stuff). My e-mail is lo23m8a@aol.com. I can also help with eecIV issues but it's been a long time.

Re: Ford EEC IV computer
 

Just a little update for those that responded or might be intrested,,, I have had time to do a little more with the project. I picked up a computer from the local pick a part from a 2.3 5 speed. I was wanting to get one from an automatic 2.3 due to Ed mentioning the OEM auto might have a better timing curve to work with my C-4 but went with what I could get my hands on. The ECM swap showed no change, the truck still had periods of stumbling and struggling. A day or so later I robbed a set of injectors from an old 3.0 engine to replace the "rebuilt" injectors I got from E-Bay. With the used injectors the engine sounded smoother at start up, but I had simular issues with the first test drive. after a day or so either the "new" ECM has learned the "new" old used replacement injectors or the fuel pressure issue that I never got to monitor had fixed it's self. I have enough confidence in the truck now to drive it 15 miles from my brothers towing service lol. Due to my ignorance with EFI I was not sure what might have been hapening. Was the likely scenerio an injector sticking open or not opening at all? I assume on a 4 banger flooding or dudding is 25% of the engine and it it pretty well dead either way. After many talks to a mechanic friend of mine about my issues with the truck it became apparent that due to my ignorance I blocked off the heat pipe that came from the heater hose to the intake. I guess I was thinking carburetor. Guess that is why the 2.3 is only getting 13 or so mpg since it got cold. During the summer I guess the heat under the hood kept the manifold and the sensor hot. Getting the manifold heated with coolant is the next project. Hopefully the fuel mileage will get to where it needs to be. If I can get that acomplished maybe tuning will be in the future. I appreciate the your help.

Re: Ford EEC IV computer
 

A lot of tuning changes are needed to make one drive well in the pits, & on the return road when a cam as used in a Stocker is used. Changes also needed to keep the spark plugs clean under those conditions. Even more so with a SS cam which normally has even lower vacuum. Naturally, Wide Open Throttle tuning is different from factory tuning as well.

Re: Ford EEC IV computer
 

The hot setup back in the day was a custom chip from a company like AutoLogic. Ed Hohenburgh used one in his black notch which used FOMOCO speed density.