1996 Audi A6 Quattro Base 6 Cyl 2.80L
so i am driveing down the hwy and i smell a rotting egg smile and the car is over heating and it shut off want start
Nissan Technical Advisor 9/5/2011
An exhaust odor that smells like rotten eggs is the result of a rich air/fuel mixture. This condition may be the normal result of placing a heavy load on the engine, as with pulling a trailer or heavy grade. The catalytic converter is responsible for reducing the Carbon Monoxide and Hydrocarbon levels in the exhaust. When the air/fuel mixture is too rich, the catalyst cannot convert all of the additional fuel in the exhaust. The result is a foul odor that is often asscociated with rotten eggs. If the vehicle only emits this odor under the above conditions, the symptom is probably normal. However, if the vehicle also has a running problem, engine warning light on, or emits the odor under all operating conditions, further diagnosis should be performed. Check the coolant level could be low, add fluid. Engine computer should be scanned for fault codes. Post the codes here so we can advice repair.