4wd issue!
#1
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Thread Starter
4wd issue!
Just got my new truck, but the 4wd doesnt seem to work. When you move the lever into 4wd, i can hear a relay clicking under the dash, the 4wd light on the dash will flash a few times, sometimes stay on for a few seconds, then go off. I deffinately dont have the front wheels turning. The truck is a 91 4runner 3.0 auto
#2
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check the vacuum lines http://www.4x4wire.com/toyota/tech/add/
Last edited by Elton; 03-07-2007 at 10:57 PM.
#3
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Thread Starter
With the ADD removal. Sounds very interesting and simple, but then are my cv's always going to be turning? From what I get from it, that when you remove the ADD system and clamp that fork into place, the front diff is always ingaged now, but the front drive shaft will not be turning until you engage the T-case correct?
This seems like such a simple thing, why would toyota have installed this ADD system?
This seems like such a simple thing, why would toyota have installed this ADD system?
#5
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Join Date: Mar 2005
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With the ADD removal. Sounds very interesting and simple, but then are my cv's always going to be turning? From what I get from it, that when you remove the ADD system and clamp that fork into place, the front diff is always ingaged now, but the front drive shaft will not be turning until you engage the T-case correct?
This seems like such a simple thing, why would toyota have installed this ADD system?
This seems like such a simple thing, why would toyota have installed this ADD system?
The disadvantages of the mod are of course increased wear on your front driveshaft u-joints and splined slip joint, increased driveline noise (I would think), and potentially slightly less power and decreased gas mileage (due to increased drag of turning front driveshaft.
IMO, Just troubleshoot your system and fix what's wrong instead of cutting half of it out.
Last edited by GSGALLANT; 03-08-2007 at 03:53 AM.
#6
+1 and add the manual hubs! Gas milage will go up and wear issures will go away. How do I know? I added the manual hubs (Warn) back in '91 when I bought mine new off the lot!
Chances its a vac modulator or a line is disconnected or split. Good Luck!
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#8
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I will probably do the ADD removal when I get my manual hubs in, but for now, I have checked all the vacuum lines and they seem good. The resistance across the VSV is good, the air flows through them as they should. I was trying to find the position sensor on the trans, maybe that is toast so it's not telling the vsv to let vacuum go to the actuator on the diff. What am I looking for down there? Also, I'm thinking it could be the relay, Where under the dash do I find the ADD relay?
Last edited by Kiff; 03-10-2007 at 03:48 PM.
#10
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Have taken the vac unit off the front diff? Mine didn't work either, had vacuum down to the diff unit, finally took it off, moved the rod back and forth manually, installed, worked great. It was just stuck. Just be sure you have a pan under the diff to catch the lube, and lube on hand to replace.
#11
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Thread Starter
I think I have found what is suppost to be the relay, down on the steering colum, by the firewall. All the prongs match up to the diagram, but the relay says fuel pump relay :S If this is the ADD relay, it is shot, because i dont get continuity across terminals 2 & 6 or 1&4 when 12v is applied
Last edited by Kiff; 03-11-2007 at 03:07 PM.
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