4 wheel drive doesn't stay engaged 97 Rodeo

02-06-2011, 09:00 PM
I'm having trouble with the 4 wheel drive (http://www.automotiveforums.com/vbulletin/#) on my 97 Rodeo. I can engage it and it will work for a minute or so and then disengages.
The llight comes on ititially and then goes off when it disengages.
From reading this thread I think I have a leak in a vacuum hose. I theorized the leak is small enough where it will engage but then leak down and disengage.
I'm not sure though if the system keeps a vacuum on the 2 wheel (http://www.automotiveforums.com/vbulletin/#) side while the 4 wheel is engaged. If it does then as soon as the 4 side leaked down the 2 side would pull it back. If not there may be enough tension in the diaphragm to pull it back when the 4 side loses vacuum. Either way the 2 side VSV would pull it back when I shift back to 2 wheel drive.
Does that sound right?

02-07-2011, 07:58 PM
I replaced 6 hoses on the switching unit and it seems to work.
Thanks anyway.

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