Question about 1990 Ford Bronco
It worked fine before this.
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Posted on Jan 02, 2017
The sound is not coming from the glove compartment, it is coming from the panel behind the drivers seat, that's where the relays and computer are located.
The relays click and apply power to a transfer case motor.
The motor attempts to turn a shaft that engages the front drive shaft.
When the computer thinks the shaft has NOT turned it tries again.
It will try three times then quit, figuring the shaft has not turned.
Get someone to crawl under the vehicle and engage the 4WD (just turn on the ignition- do not start the engine) See if they can hear the motor attempt to turn the shaft, it will make a clicking sound.
If not the connections or the motor may be bad.
I have found the most probable cause is the relays on the control board.
If you are technically adept --
you can remove the small side panel from behind the drivers seat and remove the control board. (remove the power plugs first)
Clean the relay contacts and bend them a little to give them more 'wipe' to keep them clean longer.
Put it back in and turn on the ignition.
Then push the RESET button on the side of the board.
Try the in / out 4WD a couple of times. If it doesn't work turn off the ignition, turn it back on and push the reset button again.
Posted on Oct 27, 2008
Me and a couple guys at work had the same problem. My brother who is a ford mech said it is a vacuum solenoid that is located on the passenger side fire wall. It should have 2 vacuum tubes and a small wire harness connected to it. On mine I turned 4wd on and nothing happened. I unhooked the solenoid and it engaged then I hooked it up and unhooked to and it was able to disengage. They only sell these soleiods at the dealers though for about $40. Ive looked all over the net and found nothing. But check those first cause if its no them then its either the hubs not disengaging or solenoid that engages the transfer case. Hope this helped.
Posted on Apr 02, 2009
I had same problem on my 2002 explorer. Its either the computer module, or the electric solenoid on the transfer case. In my case it was both. The computer module I had done twice in 14 months.
Posted on Jul 04, 2009
Ford Pick-ups and Broncos 1987-1996 Repair Guide
Fuel Injected 5.0L and 5.8L Engines - Oil Pan
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Hope helped (remember rated this help) Good luck.
Posted on Dec 02, 2009
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Oct 16, 2014 | 1990 Ford Bronco II
these issue, there are few solved help links for troubleshooting the
the link below: ---
control switch will not engage on 4WD High or Low
flashing and 4WD will engage after few minutes
details will help.
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