'93 Bronco Issues - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 11-02-2006, 01:43 PM
ramtuff101
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\'93 Bronco Issues

I have the following issues with a '93 351 auto Bronco. The 4x4 diff does not engage with the switch on the dashboard. Is there a motor on the diff itself that may the issue? Is there any troubleshooting procedures to narrow the problem down? As far as I can tell, the fuses for it are all good.

In the last two weeks, the engine has developed a high idle - 1700 rpms at all times. I checked the hoses on the engine; there was one at the front of the intake manifold that was sheared off; I replaced it and several others that were showing age wear. Also, the green and white plastic hoses coming out of coil module snapped and I patched them with rubber hose to mend that. This dropped the idle from 1900 to 1700 rpm, but not down to the expected idle.

I just dropped $2K at the Ford dealership getting the emissions systems back up to snuf. Any ideas to keep the costs of this down would be appreciated.
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post #2 of (permalink) Old 11-05-2006, 01:09 PM
 
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Re: \'93 Bronco Issues

[ QUOTE ]
The 4x4 diff does not engage with the switch on the dashboard. Is there a motor on the diff itself that may the issue? Is there any troubleshooting procedures to narrow the problem down? As far as I can tell, the fuses for it are all good.


[/ QUOTE ]

Yes there is a motor on the transfer case best thing I've found to do is get a buddy to sit in your truck while you crawl under it and have him engage the 4x4 if you dont here the motor engage unbolt it from the Tcase and have him hit the switvh again if it dont move then you either have a bad motor or a bad switch there was a post awhile back that told you how to hot wire the motor to see if it was bad. If you cant find it go to a junk yard grab a switch only like 5 bucks and swap it ouyt and see if that fixes it if it dosent its more than liokely the motor.
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post #3 of (permalink) Old 12-11-2006, 08:31 PM
kbear
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Re: \'93 Bronco Issues

Thanks guys. I have problems simular and hope this will help! All I Know is that the 4wheel drive isn't working. I just bought the Bronco so I havent much time to dig into it.
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post #4 of (permalink) Old 12-12-2006, 04:34 PM
bobstrat
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Re: \'93 Bronco Issues

i just went through the high idle thing
with my 90. the plenum gasket was shot.
i pulled codes for both the tps and iac
but it was actually the gasket.
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