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1987 4Runner SR5 4wd won't engage

Old 03-14-2008, 05:29 PM
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1987 4Runner SR5 4wd won't engage

Like the title says my 4wd will not engage. The transfer case is working properly and the 4wd light is working. I have tried to switch the vacuum lines at the vsv. I am getting vacuum at the vsv. But switching vacuum lines did nothing. I am at a loss. I have searched everywhere and can not find any info on the add system on the 1st gen 4runners. I am sure I am not the first one with this problem, and if anyone can help you guys can. Thanks in advance for any help that is provided.


Last edited by slamkad; 03-14-2008 at 05:47 PM.
Old 03-14-2008, 07:12 PM
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Can you manually engage the actuator with vacuum pump?
Old 03-14-2008, 07:28 PM
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To be honest I wouldn't even go as far as diagnosing the problem. I would do a manual hub install and call it good.
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