Electrical what speed sensor eletrical wire is for?

[Mustang5L5]

DA1 computer.

That’s a 1987 5-speed speed density ECU

 

[Jean-Marie GT]

Wow really . They put a 87 ecu in a 89 or its not a real 89

 

[General karthief]

Put the vin number into this

1979-93 Capri and Mustang Decoder

foxchassis.com

 

[Jean-Marie GT]

That said 1989.

 

[Jean-Marie GT]

Do you know if its the ecu plug is the same for 87 and 89

 

[Mustang5L5]

It is. You’ll need to dig deeper.

Is the MAP sensor on the firewall connected to manifold vacuum or sampling atmospheric pressure?

 

[Jean-Marie GT]

the map is connected to the intake

 

[Jean-Marie GT]

There is a hose from the map to the air intake

 

[Mustang5L5]

So it’s entirely possible your ‘89 has been swapped to a speed density setup.

To answer your initial question, the VSS is not used at all with speed density other than with cruise control.

As to why the car has been swapped, someone probably did some hackery in the past maybe using a donor 87-88 and a roller 1989. Wouldn’t surprise me

 

[Jean-Marie GT]

Thanks now i understand why the wire is Cut.
What are the + and the - of a speed density vs maf

 

[KRUISR]

On your VIN, the 5th to 7th digits are P4x, what number is the x?

After those three there is a letter, what is it? If it is an E the car was born with a 5.0, if it is an A then you have a 4 cylinder car someone did a 5.0 speed density swap.

 

[Jean-Marie GT]

Its a E

 

[Jean-Marie GT]

Why somebody would swap for a speed density?
What is the advantage?
Somebody told me i cant instal Cam if i dont have a maf

 

[Mustang5L5]

No real reason to purposely do it.

In stock form the speed density cars run a bit stronger, however they are very sensitive to vacuum leaks and your hands are tied when it comes to cam swaps.

You could easily convert to mass air. Here are harness kits available

 

[Jean-Marie GT]

I think There is already the maf plug. I Will take a look later

 

[Mustang5L5]

You are really going to need to roll up your sleeves and take a look at how this is wired to see if it’s done correctly.

 

[Jean-Marie GT]

Instead of Harness. I Will need a ecu if i swap to maf

 

[Mustang5L5]

Instead of Harness. I Will need a ecu if i swap to maf

You will need to do some minor requiring of the harness.

 

[Jean-Marie GT]

Except the Maf sensor plus . What is the différence between maf Harness and speed density

 

[Mustang5L5]

That's a broad question to answer. Ford made small changes in the harnesses year by year so that they don't really interchange with each other. It's not a speed density harness vs mass air, but rather 1990 harness, 1991 harness, etc.

Some of the individual wires route differently. For the most part if you want to swap to mass air you'll need a conversion harness, and also pay attention to the O2 sensor jumper pinout