Hi everyone,

My 2005 roadster has just developed a new behavior: On moderate to heavy deceleration (using engine braking alone), it will do its normal "burble" for about 3 seconds and then POP a pretty significant backfire. Simultaneous with the backfire, the upshift light goes yellow and the speedo drops by about 50%, just for a moment (other gauges may also move). Strange. After the single backfire, it goes to no burble -- just quiet deceleration.

The "normal" behavior that I've always known with the car is that it burbles on deceleration for 10 seconds, then goes to just running smoothly / quietly as long as your foot is off the accelerator.

Any ideas? It's like the "burble" programming is messed up. The car is otherwise running fine (as far as I can tell).

Somewhat related to this, does anyone have an OBD2 plug-in that adapts to an iPad app that they can recommend? I'd like to see what the ECU has to say about all this...

Thanks!
Bryan