Throttle body rebuild

Just wondering if anyone has rebuilt their throttle body. I have recently obtained an '86 5.0 bronco. After using a homemade smoke machine I found the throttle body is leaking around the shaft on the TPS end. The shaft has some slack and moves maybe a 32nd of an inch. Haven't been able to find out anything on the Internet.

Thanks!

Yo Daddio,

Welcome!

I believe the shaft seals may still be available at dealership.

Ask for them or the, Fuel Charging Gasket Kit; This kit contains the necessary replacement gaskets and “O” rings for fuel rail, injector, pressure regulator and throttle body service. - 80.6 MB pdf by Ford @ http://web.archive.org/web/20110704105317/http://www.fordinstallersupport.com/files/catalogs/fes200.pdf

site is very slow and did Not open for me after 5 minutes.

Need to check that the shaft is not worn out, if the shaft is okay, get brass sleeves to install in the TB or take the TB to a

machine shop and have them install the seals.

...

See http://www.throttleshaftrepair.com

"Simple and Easy. No need for a drill press, special bits or complicated jigs - the Zako ATS throttle shaft repair kit lets you ream out the throttle body and install new bushings perfectly, every time!" Ask them if they have your year kit.

...

Here is an overview of "TB Shaft machining. $35;

Shaft is machined to a thinner profile to reduce turbulence. New low profile (flush with shaft) screws are installed. Not available by itslef at this price, only as part of TB boring service."

by http://www.maxbore.com

AsK at local NAPA, ETC. And some of the old speed shops may have some.

1986 FORD BRONCO 5.0L 302cid V8 : Fuel/Air :

STANDARD MOTOR PRODUCTS 2006 Click for more information about this part

{Click Info Button for Alternate/OEM Part Numbers} Contents: Injector Seals, & Gaskets for IAC, TBI, Plenum, & EGR Valve

http://www.rockauto.com/info/154/2006photo%20primary__ra_p.jpg

$0.64

http://www.rockauto.com/m/mobilecatalog.php?carcode=1105917&parttype=6474

Cleaning Procedures as Shown in Idle Air Control (IAC) Sludge; Poor Idle TSB 91-25-07 for 85-92 Bronco & F Series & many others @ http://www.supermotors.net/registry/media/724437 by Ford by Stephen

Cleaning in an 86 5.0

Source: by Sixlitre (Malcolm H, Eddie Bauer) @ http://www.supermotors.org/clubs/superford/vehicles/registry/detail.php?id=4970&s=27143

Yo,

Forgot to include this:

http://broncozone.com/topic/22150-fast-idle-problem/?pid=115710

"I have spent some time this week trying to set up an air bypass around the IAC valve by cutting away some of the gasket between the IAC in and out air holes, rather than pay big bucks for Fords spacer kit. I cut away the center of the original IAC gasket from the outside of each hole to the outside of the other hole, giving about 1/2" gap for the air to pass through. I noticed an immediate improvement in the engines starting behavior, but it would still die occasionally.

For most of my trucks life it has been dying when it was started hot. It would rev up and then drop the idle so low it would die unless I would catch the idle with the accelerator. It would never die when cold as the IAC would keep the idle speed up, and it never died at stop lights. Now it's worst situation seems to be when it has been shut down for a half hour or so, and restarted. I wonder if the heat soak is fooling the ETC into thinking the engine is warmer than it really is.

I decided that more improvement could be had if I had a thicker gasket, because the original IAC gasket was very thin (0.018"). I had some 0.030" gasket material so I made my own with the same 1/2" cut out. This gave enough bypass to noticeably raise the idle speed and almost eliminate the dying. After maybe 50 starts in the last few days, it only died twice. After so many years of catching it with the accelerator it is darned hard to leave my foot off it. It is clear to me that by trial and error one can tune the air bypass without the need for the expensive Ford kit. I may combine the two gaskets for more bypass, but the idle is about as fast as I would want now, especially for driving in snow." by Nelbur in an 86 5.0

Thank you very much, this gives me a place to start.

I was able to talk to a ford mechanic today. He has several old broncos. He told me to check voltage to IAC and TPS first. The IAC should compensate for the throttle body if it's working correctly.

Yo Daddio,

yw!

Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19 @

http://broncozone.com/topic/14269-code-reader/?pid=74587&mode=threaded

Some basics;

The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test and greater than 180° F for the Key On Engine

TPS Test, Operational Description & Parameters

Source: by Ryan M (Fireguy50) at http://web.archive.org/web/20120121184148/http://www.oldfuelinjection.com/?p=30

Engine Coolant Temperature Sensor (ECT) Test

Source: by Ryan M (Fireguy50) at http://web.archive.org/web/20120121075530/http://oldfuelinjection.com/?p=28

See Ryans other sensor and actuator tests at

http://web.archive.org/web/20120121053828/http://www.oldfuelinjection.com/?p=1

Save that link until you can copy each page to a PC, cd,netc.

Will do, thanks! This forum has been a big help.