1989 Bronco Full Size Idle Problems

Hey Gang,
I have an 89 full size, 5.8, Eddie Bauer. The motor was rebuilt about
50K miles ago, the transfer case was replaced this month and the
transmission was serviced at the same time. The truck also has a new
fuel filter, and the emissions were all gutted and rebuilt in the last
30 days.

The problem is with the low idle, if the truck kicks down from fast to
slow idle, it stalls about 50% of the time. This seems to have started
after the transmission service and new transfer case.

Would resetting the computer restore the idle to default? If so, how
do I do it? If the computer won't do the trick, is there an easy way
to up the idle speed on an EFI engine? Is there a chance that a vac
hose is unplugged someplace that is causing the stalls?

Thanks!

wrote:

> One more question...
> I've never serviced an Idle Air Valve, I know what it looks like, but
> can you tell me where to look for it?

It is attached to the Throttle body by two bolts, where it routes air
around the throttle plate {butterfly} Find where your accel/Cruise Control
linkage attaches.. that's the throttle body, disconnect the air tube to TB.
You'll see one port in front of the throttle plate.
Clean the area around throttle plate, as well.




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