I'd assume you will need a mulitmeter and a repair manual. You'd have to just check resistance levels. Chances are it is okay but I would check it. You could also just hose it with some carb cleaner.

Also...the Lincoln you pulled the MAF from may have had the grey top injectors which are like 14-15lbs/hr and you truck almost certainly has the 19lbs/hr injectors which are orange. BUT....I think all MAF vehicles come with at least 19lbs/hr injectors.

You NEED to get an automatic computer. The AOD one works with the AOD and T5 where the T5 one only works with the T5. I installed a T5 computer a while ago in a car I converted that had the AOD and it barely ran.

So...your entire firing order lines up now the 1-5-4-2-6-3-7-8? With plug wires, injectors, and cam?

FYI...Lexluthr69 had his injectors misfiring when he swapped to the HO roller cam when using the FMS MAF kit. Switching them back to the correct order will make drivablility and power greater.

 

Check voltage on the MAF between the red and black wire with the key on, truck off. It should be 12 volts. Check the voltage between the other two wires with the truck idling - it should be .6-1.7 volts if I remember correctly. Both of those tests should be done by back probing the maf connector with it still connected to the meter. Try cleaning the element as Hitmanx suggested as well.

Hitman, besides one being for an automatic and one for a stick, what is the difference between the A9P and the A9L? I'm in agreement with you that the automatic one would probably make a difference in how the truck runs, but I was just curious as to the actual differences.

 

You wanna know somethin...I really haven't the slightest what the actual differences are. Maybe in pin outs, how the EEC-IV looks for certain parameters, internal wiring, etc.

I know in my WRX when I added a TurboXS brand engine managment computer harness and Unichip, they had specific Automatic ones. I compared two of the harnesses and the differences were a single wire. That Automatic one will also work on the Manual too.

Anyway back to Fords... the A9L and A9P were apparently better computers for the '89 HO MAF model year. I remember a few people testing out a few computers and the vehicles all ran the same (performance wise) no matter what computer was in there.

They are supposed to have a more aggressive timing curve or somthing....well just get you mods done and then have a custom chip burned for really aggressive timing tables.

 

quote: So...your entire firing order lines up now the 1-5-4-2-6-3-7-8? With plug wires, injectors, and cam?


yes that is the firing order i have.

 

Where did you pin your injectors for yours to run right? and did you change your firing order to the 1,3 order? Will changing to the A9P puter fix my problem and what year one do I need to get? The A9L one I have is a 95.

 

You NEED to get an automatic computer, I think lots of problems lie with that first.

If that computer is a '95 it is made to control an AODE...

 

The A9L should only be from 89-93. Ford changed a lot of stuff around in 94, and the computers are different. I think that I'd start with the A9P since you are sure you don't have an E4OD. Either you have the year wrong, or the computer's not an A9L, so check on that too, it could be causing a problem if the computer is not what you think it is. To my knowledge both the A9P and A9L were on Mustangs from 89-93.

I'm using a Mustang injector harness with a plug at the back of the engine. I plugged in the pins to the computer terminal in the H.O. firing order, but I swapped 3,5 and 4,7 wires on the injector harness side of the plug at the engine so it would be easier for me to change injector order if I ever swap in a 351. So my injectors fire in the 302 truck firing order.

I used the pin locations for the injectors from this wiring diagram from a 1990 5 liter Mustang. I don't have an electronic copy of the truck wiring harness, but if you have a Haynes manual it should be in there. I would compare the two and make sure all of the pins are going to the correct place for the Mustang computer.

 

The year is a 1995 A9L puter I am sure of that. I double checked the puter and the packing slip that came with it. They always send the vin of the vehicle that it came out of. It is a 1995 ford mustang gt 5 spd. so i need an A9p from 89-93 then correct? and I need to pin the eec with the HO pins. I dont understand when you said you switched the 3,5,4, and 7 on the injector side.

 

When you say check the truck wiring do I need to pull out the pins from the factory harness and re pin them? What i did was I had a harness made by a guy at FORD. It has the pig tail for the MAF, and the 6 injextor wires. What i did was pulled the plug at the injector and removed the colored wire left the red wire in . I installed teh new color wire and then pinned the other end to the EEC. I just taped up the factory wires at the end of them. I have the injectors matched with the cylinders 1 is 1, 2 is 2, etc. The front left is cylinder 1 and it has injector 1. 1 and 2 I left pinned to 58 and 59 2-8 is what i added to the new harness.

 

A9L was never made in 1995. The A9L stopped in 1993 I think.

You don't necessairly have to have the A9P, the C3W1 will work, A3M1 also. Just get an AOD computer w/ MAF.

 

But it needs to be for a 93 correct?

 

That is a little confusing and was a little hard to explain. I have a plug inbetween the wires attached to the computer and the wires coming from the injectors, so I switched the wires there. Since you don't have a plug there, you are right to change the connections at the computer to reflect the truck firing order.

When I say check the wiring, I mean to look at a wiring diagram with the pinout information on it. What you will want to do is compare pin number for pin number what wire does what. If there is a difference between the truck computer and the mustang computer, you should put the wire in the correct place on the mustang computer. I linked to the diagram for the mustang in my last post. I don't have one for the truck so you will need to find one, unless I can find someone with a scanner.

I don't know what computer you have but I'm with hitmanx that the A9L wasn't made after 93. The designation should be on a small sticker on the computer where the wiring connects. The 94-95 computers didn't use a bap and maybe a couple other differences, and I've heard that they aren't has responsive to modifications as the 89-93 computers are either.

I would say that an 89-93 computer would be your best bet. Most people use computers from these years for MAF swaps. There are several designations other than just A9L and A9P that were used and will work as hitman x said.

 

I am not using the wires from the factory set up on the injectors. The only wires I am keeping in the existing harness are the red power wires for the injectors. I added the color wires to the EEC to control the injectors.

 

I'm saying check the entire harness, not just the injector wiring. I think you have the injector harness right.

 

AAAAAAAHAAAAAAAAA!!!! I have several wires that have to be changed to make mine run right. The puter i have is a 1994 stang. I have to move 9 wires on my truck harness to the new pins. I think I found out why it shakes when it shifts to hi gear. The shift silonoid (sp?) 1 and 2 have different pin locations on the mustang puter. Gonna swap those this weekend and hopefully will fix it.