Hi All, I am having a very worrying issue with my Audi A4.
Model is: Audi A4 B5
Year is: 1997
Engine : 1.6 Gasoline.

The engine throttle goes wildly up to 7000/8000 rpm whenever the accelerator pedal is pressed to above 3500 rpm - by itself. The only way to get the throttle down is to switch of the engine(turn ignition key to off position)!

To restart engine without the wild self-acceleration - we have to play a ittle with the accelerator cable under the hood where it connects to the throttle device.

I have performed a diagnostic of the engine an obtained the results attached.









Anyone has any idea or came across such an issue .... please let me know.

It is quite dangerous to be driving it at the moment since it throttles wildly up to maximum throttle revolution 7500/8000 rpm on its own whenever we accelerate to above 3500 rpm and does not return to idle at all!

Thanks for any feedback

 

So your car does have a mechanical throttle unlike most of the electric servo units today?

I'd check the grounds on the engine wiring harness first. A loose ground will cause all kinds of issues. Just look for a group of wires coming out of the harness to a bolt that is attached to the block and/or body. Loosen them and re-tighten them to make sure they're making good contact.