Hello all, long time lurker, first time posting. I love German engineering, but own mostly Fords and Dodges, all manual, with the exception of this wonderful 100.

I have a 1993 Audi 100S Automatic. The car was purchased 2 years ago with 204K. When I bought it the PO's mechanic had installed the tranny filter with no o-ring. So it was slipping, getting stuck in gear, all that good stuff. He thought it was dying, I took a chance and got it for a steal.

So 55k down the road, right at 259,000 it's starting to act up again. I've already got more use out of the car than I paid for, but I'm fairly attached to this thing now.

The car as it sits will rev and slide into 2nd and 3rd gear. But 4th is solid and shifts perfectly. All driving ranges engage smoothly and as quick as ever.

I did a service just cause I had an extra filter and some fluid laying around and the problem is still there. The old fluid was beautiful on the way out, not burnt or full of crud. The filter was fairly clean too. After the service, the problem persists.

I'm thinking maybe solenoids, mainly because 4th is still a perfect shift and I'm not finding chunks of clutches in the pan. I don't recall how many solenoids were in there as I didn't pay that much attention.

Can I find them online? I can't find anything any of the usually places I look. Google has been no help either.

Could I have pissed off the computer for the tranny? Simple battery disconnection should fix that I assume. I'll try that.

If this thing had a manual I'd love it even more. I guess I'll have to look into that option.

I will say I love these things. I've heard horrible things about maintenance difficulty and parts prices, but that was all bs. This thing is built better than any American car I've had the "pleasure" of toying with and most of the parts are decent priced.

My next move is a B5 S4 for some DD fun.

Any help is appreciated!

 

I had a 92 100 Auto and it did the same thing only 2-3 it would flare. I removed the valve body and found the valve that controlled the 2-3 upshift and it was sticky. I used like 1500 grit sand paper and rolled it in my hand until it was nice and smooth in the bore. Didnt fix it 100% but it made it so the flare shift was extremely rare. The cars still running around town and it had 220k when i sold it.

 

Alright, I'll pull it apart and see what I can see. I had a feeling I was at the "pull the valve body apart" stage.

How difficult was it to get apart? I assume it shouldn't be too bad but the only autos I have to go on are American...

At least at this point I can do a service on this transmission in 20 minutes. Haha

 

It was pretty easy. Not alot to it, its real straight forward. I found plenty of internal working information on the trans making diagnosis rather easy.

 

Awesome! I have some documentation laying around, I'll take some time and read up.

I've been impressed so far with how straight forward most of this car is. I'll pull it apart this weekend and report back!

Thanks for the information.