4X4 Problem, not engaging
Jan 18, 2010 | 06:33 PM
#42
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From: Atlanta GA
In your first post you said you were getting vacuum at the solenoids, so the only thing between those and the actuator is two vacuum lines. There might be a leak in one of the two lines running from the solenoids to the actuator, try seeing if you have vacuum in the lines where they connect to the actuator. That is where my problem was so you can reference the picture I posted. Luckily mine was just loose, but it would be easy to replace one of those hoses if that is your problem.
Jan 18, 2010 | 06:34 PM
#43
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From: new market Alabama
the vsv is located under the hood on the passenger side and it will be two colors a red one and i think i blue one maybe green but i know for a fact one is red. it is mounted on the fender should be close to the top about the middle of the fender
Jan 18, 2010 | 06:39 PM
#44
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From: Portland Oregon
Ok guys my 4wd isn't working ether, so the first thing I did was check the vacum and it is good at the cellenoids. The thing is when the truck is on if I put it in 4h the shifter lock in place but if I put it in 4L it won't stay there it slides back to the 4H postion. I took off the actuator and put vacum to it and it works back and forth no problum. I have been getting parts of a 91 4wd and there is no battery in it and when I try to put it into 4h and 4L it does the same thing, so I was wondering if on mine the 4wd system is just not getting electrical power to work. Any ideas?
Jan 18, 2010 | 06:42 PM
#45
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From: Portland Oregon
I had the same problem when I bought my '95 4runner. My problem was the diaphragm on the ADD modulator on the front diff was stuck. I had to pull that sucker off to find out what the problem was. Its really easy. 4 bolts, some silicone sealant and some diff fluid. After I did that, I locked the two shafts together permanently since I already had manual locking hubs. Most likely you will have to REPLACE the whole modulator because even though I freed the diaphragm up, it still wouldnt be moved by vacuum.
Jan 18, 2010 | 06:46 PM
#46
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From: Atlanta GA
Today took the actuator off and the side lock works perfectlly and I toke the actuator and put vacum to each side and it slides back and forth with no problum. That's what I was saying I know now it's not in the front end, everything works right in it.
Last edited by Jerbou71; Jan 19, 2010 at 01:52 AM.
Jan 18, 2010 | 06:46 PM
#47
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From: new market Alabama
no you didnt misunderstand there is no way the the fork is stuck and keeping the 4wd shifter from going into 4lo once you in 4wd and the front axle is locked its done it either has to do with something in the cab and or on the xcase or in the xcase
Jan 19, 2010 | 04:37 AM
#48
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From: Atlanta GA
if its slippin out of 4lo no fuse is going keep it in 4lo what you need to check is the shifter in the cab and on the xcase if its an automatic there are 4 screws to pull the cover and pop the ect button out and look at the 4wd shifter mine was kinda the same way i just cleaned it up and moved the little pieces of plastic to where it would go all the way back and i sprayed the xcase shifter on the case with some engine degreaser and wd40 and it worked awesome. if that doesnt solve the problem then it could be a problem in the xcase and the first thing i would do is drain it and see what the fluid looks like
Jan 20, 2010 | 02:36 PM
#49
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From: Atlanta GA
Well today I took off that cover over the shifter and fixed the problum with it staying in 4L by grinding the metal bracket a little bit more and it works great. After that I lifted the whole truck off the ground and put it in 4L and nothing, so what I did was put it in 4L and ran a vacum line down to the accuator on the front diff to engage the sleve and the 4x4 light came on but no front wheel spin.
I looked on this page http://personal.utulsa.edu/~nathan-b...26addcontr.pdf
if the Transfer Position Switch is bad, will the tranny shift into 4wd?
I looked on this page http://personal.utulsa.edu/~nathan-b...26addcontr.pdf
if the Transfer Position Switch is bad, will the tranny shift into 4wd?
Last edited by Jerbou71; Jan 20, 2010 at 03:39 PM.
Jan 20, 2010 | 03:40 PM
#52
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From: new market Alabama
if your going to pull it off yes you could test it but you might aswell replace it. think about how old your vehicle is if its good then maybe a year or two down the road it could go out when you really need it. thats my 2 cents on it
Feb 2, 2010 | 08:22 AM
#59
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'99 Tacoma 4WD Will Not Engage-Solved
After reading every thread I could find on the issue, I figured it was vacuum or electrical related because the system was working fine 2 weeks ago.
Toyota was estimating $900.00 for the actuator or possibly $600.00 for the servo, plus labor.
The Actual Problem was that while attempting to get my truck through EPA, I had removed and cleaned the 1 way vacuum valve to the left of the battery and unknowingly re-installed it upside down - (White UP) Doh!
Here it is shown back to correct position - Black UP!
I took my truck to a recommended shop here locally and told them everything I had done recently, so they knew where to look.
Tah Dah!!! After confirming the system engaged fine when
vacuum was applied, The tech turned the valve back around to the correct position and 4WD was fine again.
If this valve is clogged it could cause the same problem, so
for systems not engaging or stuck in 4WD, this is the first place I would look.
The mechanic bookmarked this site for future reference
after I told him how much information was available here.
Thank you
Toyota was estimating $900.00 for the actuator or possibly $600.00 for the servo, plus labor.
The Actual Problem was that while attempting to get my truck through EPA, I had removed and cleaned the 1 way vacuum valve to the left of the battery and unknowingly re-installed it upside down - (White UP) Doh!
Here it is shown back to correct position - Black UP!
I took my truck to a recommended shop here locally and told them everything I had done recently, so they knew where to look.
Tah Dah!!! After confirming the system engaged fine when
vacuum was applied, The tech turned the valve back around to the correct position and 4WD was fine again.
If this valve is clogged it could cause the same problem, so
for systems not engaging or stuck in 4WD, this is the first place I would look.
The mechanic bookmarked this site for future reference
after I told him how much information was available here.
Thank you
Last edited by Ogredaddy; Feb 2, 2010 at 08:24 AM.
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