[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index] diff locking stays locked !
Bernard/Paul, #> > But now the front diff stays locked (the green light on the dashboard > keep burning and and you feel it also) I don't know what to do to > disengage it as the switch doesn't operate anymore. but this not the > switch because the rear engage and disengage like new. > > Does anyone of you have any idea of the problem? > Is it dangerous to drive with the front diff locked? Bernard, Yes it is VERY detrimental to your differetial, and generally your whole front end, to drive with the diff locked, (actually it only hurts it when you turn corners, but when do you go anywhere and not come back?) I had this happen to me with my 93 90q, however all i did was gently "wiggle" the diff, by turning slightly left and right and driving slowly ( 10 kmh) and trying the switch as i was moving. I have used my locking system since then, in a straight line, and haven't had any trouble. #> No. 1 - You can't lock the front differential, the system in your quattro GT coupe allows you to lock the center and rear diffs. You probably locking the diffs by twisting the diff lock switch in the center console. Correct? No. 2 - With the factory Audi quattro system in a 1993 Audi 90, you can't lock the center diff. The center diff is a Torsen. You can lock the rear diff by pressing a button. Now, from the sounds of it the center diff is locked and won't release. Turning the switch pulls a vacuum on a solenoid mounted to the right side of the tranny. Look by the output flange on the tranny and you will see the solendoid, it has 2 ports on it and the vacuum lines go through the firewall to the switch. An actuating rod is pulled by the solenoid to lock the diff. To unlock I would pull each of the vacuum lines from the solenoid to release. Then if it is still locked, the actuating shaft might be binding, crawl under the car and try to move the rod and see if it is stuck. As for damage, it probably won't happen driving around with the center diff locked for a short time. Driving 5k miles with it locked on dry pavement might induce some wear. All that is happening is the drive torque is being distributed 50/50 to the front and rear axles. The front and rear axles are still able to compensate for side to side changes in wheel speed, since they are not locked. - Dave Lawson 86 gt 83 ur-q
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