This page is basically an information page
about the process involved in adapting a throttlebody (TB) from a
1986-1993 Ford Mustang or an equivalent aftermarket piece (BBK, Edelbrock,
or Ford Motorsport) to the upper intake of a 1986 - 19?? 2.9L Ranger V-6.
This sheet is not intended as a step by step instruction page, as I hope
you are at least semi-mechanically inclined to even attempt this swap. It
is not what I would call a "bolt-on" modification, (I save that
term for stuff like windshield wiper wings, cheesy stuff manufactured by
Ralley, and the like) but with the parts I manufacture, it is as close as
it can get.
In the pics you will see that I also added the parts
to my truck to convert over to a 1990 2.9L MAF computer. I also relocated
my battery and installed an airbox from an '87 Aerostar. These additions
are completely optional are NOT a requirement of this conversion.
Incidentally, I ran the truck for 6 months with the stock (1986) MAP
computer without any problems whatsoever while waiting to collect all the
parts for the MAF conversion.
Parts required for the conversion:
1. Adapter plate*****
2. Ranger TB to upper intake
3. Mustang TB to intake gasket
Allen head bolts with nuts -
for attaching TB to adapter plate
5. IAC block-off plate*****
Allen head bolts to attach block-off plate
8. Throttle linkage
Allen head bolts and nuts for adapter attachment to 5.0L
10. T fitting - for non-mass air (MAF) equipped Rangers
Section of 3/8" vacuum hose.
12. 86-93 Mustang 5.0L Throttle body
Ball stud for throttle cable - Jegs #510-20-2 $12.96 (Holley)
Provision for connecting TB to an air filtration system. (i.e. Airbox hose
or K&N filter) The stock Ranger hose will fit as I have recently
discovered. It is a tight fit, but should loosen up as time goes by. New
pics of the revision will come soon.
***** DENOTES PARTS I MANUFACTURE. ADAPTER PLATE,
IAC BLOCK-OFF, & CABLE ADAPTER - $40+shipping
Parts that require modification:
- 1. 5.0L Throttlebody
- 2. Throttle linkage cover
- 3. Upper intake manifold
There are three modifications I made to my 5.0L
TB before installing it on my Ranger. These include:
- A. Rotating the hose bung to where it points down
when installed on the truck. (180°) I accomplished this by simply
using a large crescent wrench and the bung easily rotated in the
- B. Plugging the idle hole in the throttle plate.
This is a mod that I do not think is necessary now. I did this when I
thought there was some kind of voodoo involved in setting the idle in
EFI engines. If I had it to do again I would have left it alone.
- C. Removal of the stock ball stud on the throttle
lever. This was harder than it sounds as the stud is friction-welded
in. I ended up snapping the ball off and drilling the rest out.
2. Throttle linkage cover
There is only one mod involved here and that is
trimming a notch in the cover for throttle clearance. It will be
obvious to you once you try to bolt the cover back on.
3. Upper intake manifold
There is one mandatory mod and one optional mod to
the upper intake manifold of the engine.
- A. The mandatory mod is the removal of a small
portion of a rib near the EGR valve boss. This is required for
clearance to install the lower TB bolt . I used my Dremel with a
coarse sanding roll and is tool a few minutes. The same results can be
had by using a rat-tailed file if a Dremel is not available.
- B. The optional mod is the matching of the
adapter plate to the upper intake manifold. This should be done with
the upper intake removed of course. Currently, mine is not matched and
it really runs good. I have a spare upper that I am porting and
matching and will install at a later date. The hole in the plate is
large enough to support a 65 mm TB should you like to go that large.
The Ranger upper can be matched with a 2" sanding drum mounted in
an electric drill with coarse paper to start with. I matched mine in
one afternoon. The intake can be tapered to match quite nicely, but
care should always be taken to not go too nuts and grind through the
casting. An easy way to match the new gaskets to the larger holes is
to bolt everything together and trim them out with an Exacto knife or,
like me, my Dremel.
DON'T TRY TO PUT THE IAC ON THE MUSTANG
TB INSTEAD OF THE RANGER'S UPPER INTAKE. IT WILL HIT THE HOOD.
That comes from experience and a nice little
outward dink in my hood.
The Idle Air Controller for the Ranger
requires a hose which must be attached to the hose bung on the Mustang
TB. The Ranger, however, utilizes 2 bungs that feed the IAC and the
driver's side valve cover vent. If you are installing this on a MAP
EFI Ranger (stock except California 1990 model), you can use the
supplied hose and T-fitting to connect both the IAC and the valve
cover vent to the single bung on the Mustang TB. If you have a 1990
California model Ranger OR have converted your truck to MAF (like I am
doing using Bob Marrs' instructions at Kunz Korner
or the MAF conversion
you must hook the valve cover vent to an independent source of
filtered air. The reason for this is that the MAF meter measures how
much air is entering the engine and calculates the required amount of
fuel. By allowing unmetered air (like through the valve cover vent)
into the intake tract down stream of the meter, the computer will not
calculate the correct values and the truck will run lean. Supposedly,
the computer will eventually figure this out and compensate, but I
would rather have all my ducks in a row to start with and not have
that thought lingering in the back of my head.
If you have questions, or comments about this conversion, I can be
reached at firstname.lastname@example.org. I hope everything goes well with your
I will have pics of the revised intake soon -
no more Crown Vic elbow required! Make sure to check back soon.