Tyresmoke Forums - View Single Post - Pinking / Pinging / Predetonation in Audi 4.2s

sutherland · 06-07-2009, 09:00 AM

More than once, and in more than one Audi 4.2 (S8 and S6) I've had pinking. This seems to occur if I've been using 99 Octane fuel in the UK or 102 octane fuel in Germany and then only been able to get 95 octane. I've found (depending on the car) that it can come at 2000-3000 rpm under medium load or between 5,000-6,000 rpm under hard load.

I thought that the ECU was supposed to adjust back for the lower grade fuel to avoid this, but I've read elsewhere of folk having the same problem on standard 4.2 Audis and Audi saying there's nothing wrong etc. I don't much like my car doing this so wonder if anything can be done about it. Is it worth disconnecting the battery to force an ECU reset when one is forced to fill up with 95 octane fuel?

06-07-2009, 09:00 AM	#1 (permalink)
sutherland Fiat 500 Join Date: Jan 2009 Posts: 48	Pinking / Pinging / Predetonation in Audi 4.2s More than once, and in more than one Audi 4.2 (S8 and S6) I've had pinking. This seems to occur if I've been using 99 Octane fuel in the UK or 102 octane fuel in Germany and then only been able to get 95 octane. I've found (depending on the car) that it can come at 2000-3000 rpm under medium load or between 5,000-6,000 rpm under hard load. I thought that the ECU was supposed to adjust back for the lower grade fuel to avoid this, but I've read elsewhere of folk having the same problem on standard 4.2 Audis and Audi saying there's nothing wrong etc. I don't much like my car doing this so wonder if anything can be done about it. Is it worth disconnecting the battery to force an ECU reset when one is forced to fill up with 95 octane fuel?