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Car Forum / Jeep / January 2004YJ Axle Shift Motor
I was posting as Jeepers and just realized that someone else posts here using the same name ( or someone else use to use that name) so you will notice I changed my nick a bit. Anyways 2 days ago I had my vehicle in 4WD and today I went to work and noticed that the front axles are locked in 4wd. The indicator light does not indicate that I'm in 4WD and responds to me shifting in and out of 4WD. From what I have read when I shift to 4WD the transfer case of course shifts the gears and via vacuum it trips a pressure switch to energize the indicator light.....this all seems to be in order. Also I understand it also applys or removes vacuum on the axle shift motor and engages / disengages the front axles. So from this I guess I can assume one of the following: 1:) I have a bad vacuum line 2:) The shift motor diaphram is damaged 3:) The shift linkage from the shift motor is damaged / jammed Is there an easy way to manually disengage this until I get time after NewYears to really look at the problem. Also does it apply vacuum to engage the front axles or remove vacuum? You can pull the vacuum hose plug off of the front axle and then with the engine running see if you can tell if one side still has vacuum to it. If it does, then place that side onto the opposite fitting from where you pulled it off. That should disengage it and hold it there until you can check out the entire system. You didn't tell us what type of vehicle you have but if it is like mine (91 YJ) then this should work for you. My YJ has the switch for the 4WD light on the front axle disconnect so it would still be lit up if the front axle is still engaged. Might yours be like this also? If so, you have a different problem. Good luck and Happy New Year! Dave | I was posting as Jeepers and just realized that someone else posts | here using the same name ( or someone else use to use that name) so [quoted text clipped - 19 lines] | | Also does it apply vacuum to engage the front axles or remove vacuum? Sorry 87 YJ I actually applied full vacuum to the diaphram tonight and then reconnected the whole works it seems to have cleared up the wobble to some degree, I should have also mentioned that I just did a 1" body lift on the vehicle but I had noticed this the day before I did the lift but it has happened in the past where it seemed to lock then release after a bit of driving. The steering is a lot better now but I still notice that slight resistance on slow tight corners and I'm suspecting it may have something to do with the lift and the length of the streering shaft to the power steering pump. >You can pull the vacuum hose plug off of the front axle and then with the >engine running see if you can tell if one side still has vacuum [quoted text clipped - 32 lines] >| >| Also does it apply vacuum to engage the front axles or remove vacuum? No... you posted as "Jeepster" and the other guy is "Jeepers". As far as your YJ... it is vacuum activated, and prone to problems. There is a modification that eliminates the vacuum actuator. I'm sure someone will chime in with the link (Bill). -- JimG 80' CJ-7 258 CID 35" BFG MT on 15x10 Centerlines D44 Rear, Dana 30 Front. SOA 4.56 Gears, LockRight F&R Dana 300 w/4:1 & Currie twin sticks Warn X8000i w/ dual batteries > I was posting as Jeepers and just realized that someone else posts > here using the same name ( or someone else use to use that name) so [quoted text clipped - 19 lines] > > Also does it apply vacuum to engage the front axles or remove vacuum? In a Google search I saw a Jeepster but that may have been a long time ago and not a person who popped in once or twice. I will change back the nick. :) >No... you posted as "Jeepster" and the other guy is "Jeepers". As far as >your YJ... it is vacuum activated, and prone to problems. There is a >modification that eliminates the vacuum actuator. I'm sure someone will >chime in with the link (Bill). Beat ya Bill: http://www.quadratec.com/cgi-bin/sgin0101.exe?&UREQA=1&UREQB=2&UREQC=3&UREQD =4&FNM=00&T1=52435+00&AID=10273891&PID=1117139 JimG > I was posting as Jeepers and just realized that someone else posts > here using the same name ( or someone else use to use that name) so [quoted text clipped - 19 lines] > > Also does it apply vacuum to engage the front axles or remove vacuum? Try again to connect it all together: <http://www.quadratec.com/cgi-bin/sgin0101.exe?&UREQA=1&UREQB=2&UREQC=3&UREQ D=4&FNM=00&T1=52435+00&AID=10273891&PID=1117139> > Beat ya Bill: http://www.quadratec.com/cgi-bin/sgin0101.exe?&UREQA=1&UREQB=2&UREQC=3&UREQD > =4&FNM=00&T1=52435+00&AID=10273891&PID=1117139 > [quoted text clipped - 23 lines] > > > > Also does it apply vacuum to engage the front axles or remove vacuum? Hmmm... still didn't work... I never be as good as Bill. :-( > Try again to connect it all together: <http://www.quadratec.com/cgi-bin/sgin0101.exe?&UREQA=1&UREQB=2&UREQC=3&UREQ > D=4&FNM=00&T1=52435+00&AID=10273891&PID=1117139> > > > Beat ya Bill: http://www.quadratec.com/cgi-bin/sgin0101.exe?&UREQA=1&UREQB=2&UREQC=3&UREQD > > =4&FNM=00&T1=52435+00&AID=10273891&PID=1117139 > > [quoted text clipped - 23 lines] > > > > > > Also does it apply vacuum to engage the front axles or remove vacuum? That should have worked. http://www.quadratec.com/cgi-bin/sgin0101.exe?&UREQA=1&UREQB=2&UREQC=3&UREQD=4&F NM=00&T1=52435+00&AID=10273891&PID=1117139 > Try again to connect it all together: > > <http://www.quadratec.com/cgi-bin/sgin0101.exe?&UREQA=1&UREQB=2&UREQC=3&UREQ > D=4&FNM=00&T1=52435+00&AID=10273891&PID=1117139> Thanks I noticed the long url and cut and past it... Hmmmm $170 US ....maybe I will try to get this old stock one cleaned up and working properly. I was thinking of maybe buying a new vac harness for the axle shift motor and pulling off the motor and cleaning it up. >Beat ya Bill: > [quoted text clipped - 26 lines] >> >> Also does it apply vacuum to engage the front axles or remove vacuum? You didn't say what year or model, there are some differences. Pressure switch on the firewall sorta indicates '87 to '90 YJ Wrangler. First off, don't worry about the front axle being continuouisly engaged, all of the TJ's ('97 and later) run that way all the time. The shift motor is vac pulled each way, in and out. The 4wd pressure switch and the 4wd light are quite reliable, if the light works and responds, things are usually all right in the axle. In fact, the light will not go out until the axle disengages. The really shaky part of all this is the vac lines and the switch on the transfer case. ($35 and $15 respectively) So if all that works, I have to ask what makes you think it is locked in 4wd? The only thing that can be broken and give you this particular set of symptoms is the shift fork inside the shift motor. 4 bolts and you can inspect it. > I was posting as Jeepers and just realized that someone else posts > here using the same name ( or someone else use to use that name) so [quoted text clipped - 19 lines] > > Also does it apply vacuum to engage the front axles or remove vacuum? 87 YJ Laredo / 258 cu It seems to have a bit of bump steer ..... not real bad but none the less there is a bit of a bump in the steering wheel when I turn corners. I have inspected the vac lines and they "appear" ok but I suspect that maybe it was caused by a 1" body lift that I did , but then again I did notice it just before I did the lift. I plan today to pull the cover and cycle it in and out of 4WD and watch the fork it might be sticking, I also have a vac test guage and I plan to check the vac signal to each side of the diaphram. >You didn't say what year or model, there are some differences. >Pressure switch on the firewall sorta indicates '87 to '90 YJ [quoted text clipped - 39 lines] >> >> Also does it apply vacuum to engage the front axles or remove vacuum? What size suspension lift do you have, if you have one, and do you have the factory Pitman steering arm or a dropped Pitman arm? Jerry -- Jerry Bransford To email, remove 'me' from my email address KC6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ > 87 YJ Laredo / 258 cu > [quoted text clipped - 50 lines] > >> > >> Also does it apply vacuum to engage the front axles or remove vacuum? Standard suspension with 300,000 km's on it. >What size suspension lift do you have, if you have one, and do you have the >factory Pitman steering arm or a dropped Pitman arm? > >Jerry AH HA!!!: Check your front axle knuckle U-Joints! One of them is binding up. Look for a tell tale rim of rust right by the rubber seal. > Standard suspension with 300,000 km's on it. > >>What size suspension lift do you have, if you have one, and do you have the >>factory Pitman steering arm or a dropped Pitman arm? >> >>Jerry If that is it I know which one it is, I replaced the drivers side u-joint last September and never got around to doing the passenger side. ( I broke my litttle 5" vice on the last one and haven't replaced it :) >AH HA!!!: Check your front axle knuckle U-Joints! One of them is >binding up. Look for a tell tale rim of rust right by the rubber [quoted text clipped - 6 lines] >>> >>>Jerry |
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