I love my Audi. This is my families 3rd A4 and usually never have any problems. But lately my 2001 A4 1.8T has been giving me alot of problems. Todays problem is as follows: Whenever I shift into 3rd gear and the RPM would be relatively high (above 3500) then the gear grinds. To test this I would downshift, grind. Go to 5000rpm in 2nd, shift to 3rd, grind. I would be in 4th... put my clutch in completely, and shift, grind. Doesn't grind when I left go of the clutch, grinds when I shift. When I shift at lower RPM's nothing goes on. WHAT IS GOING ON?!?!?! some advice please

 

synchros are probably gone...

 

what could be the cause of this? The car is not even a year old. I never have grinded the gears before this problem occured either.

 

lets just say............ The Drivetrain is Audis Weakest Link.

 

just for personal growth. Could you please explain the synchros. I'm on a quest to learn about cars... I got my car back from the shop Friday (wheel bearings were worn down) and I really don't feel like giving up my car once again, but I know it must be done. I know what synchros are and what they do. But what would cause this problem is my question I guess.

 

ummmm...... easiest way..... they are gears inside of the tranny. i cant explain a theory on it.

 

1. engine - A. clutch - 2. layshaft - B. gear selector - 3. various transmission gears
1) The engine speed is controlled by the throttle alone when the clutch is disengaged ("in"). It is equal to the layshaft speed when the clutch is engaged.

A) The clutch disconnects the engine from the layshaft when you step on the pedal.

2) The layshaft speed is equal to the engine speed when the clutch is engaged. The layshaft speed is related to the road speed when a gear is
selected. Therefore, when the clutch is engaged AND a gear is selected, the engine speed is related rigidly to the road speed. (Nobody spins the wheels in this schematic outline!) When the clutch is disengaged AND the selector is in Neutral, the layshaft coasts down freely, regardless of either engine or road speed.

B) The gear selector disconnects the layshaft from the transmission gears when you select "Neutral", and connects the layshaft to a specific transmission gear when you select one.

3) The various transmission gears are being pushed around by the road speeding under your car via the differential and driveshafts. All of them
are spinning at different speeds in rigidly defined relationship to each other. If your tires are not slipping, the speed of the system is rigidly proportional to your road speed.

I think that is a pretty good description. What why would it break or cause problems?

 

Gotta disagree there.

 

i dont work on transmissions to know what the cause is.... call up AOA and find out... or speak to your dealership's service manager to find out.

 

ok mark.... care to enlighten the subject then with an idea?