hillpc |
01-15-2019 07:13 PM |
On my 97 A8, there's a mechanical lever with a ball (the end of the cable snaps over the ball) on the driver's side of the trans that gets moved through all the 7 positions as the cable is moved by the gear selector inside the cockpit. Have someone move the selector lever inside the cockpit while you watch to see if the lever with ball is being moved. The operator should feel all 7 detents (clicks). There's also the F125 switch on the side of the trans that reads the position of the lever with ball and tells the computer what gear is selected. I wouldn't think your problem is that switch, since you only feel 3 positions (or is it 4, P R N D?) when you should feel 7 (if I understand you correctly.) Did the clamping mechanism at the trans end of the cable sheath, or the U-shaped clip holding the sheath to the selector at the cockpit end come loose? If that happens I imagine the whole cable, not just the inside wire rope, could move, which would make it seem like you're running out of travel on the selector. But if the car is actually in neutral the whole time (does it idle down in R and in D like it should?), it sounds like the cable is not actually moving the lever on the side of the trans or the manual valve inside the trans. If the car does idle down in R and D, but reads N, it could be the F125 switch not sensing the position correctly. You'd probably get a code if that happens.
I don't know where the cables usually break, though the plastic ring at the cockpit end of my cable broke when the manual valve inside the trans (which is moved by the lever with ball) seized up when hot and I kept pushing on the selector handle real hard trying to get it into Park. I bought a used cable and replaced the manual valve that was seizing in place when hot. The thread at https://www.audiworld.com/forums/a8-...2891020/page2/ has more info on that problem, with a lot of other meandering about valve body crack, F125 switch, and blown A drum. Since my cable was intact except for where it hooked to the selector, I was able to drive the car for testing before I had a replacement cable by unhooking the cable completely from the selector, and just pulling or pushing on the cockpit cable end (with the broken ring) to select the gears. I also bought a replacement F125 switch because I opened mine for inspection by drilling out the rivets and I didn't want to mess with reassembling it.
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