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Audi 200/100 Turbo. Petrol smell whilst driving Sometimes accompanied by a ticking noise. Introduction This is a very common problem for 5 cylinder turbo charged Audi’s. The symptoms are usually the following, immediately after start up there is a strong smell of petrol in the cabin and a loud ticking noise from under the bonnet. The smell might also be evident when the engine is warm when accelerating hard or climbing steep hills. Another problem this fault can cause is poor acceleration at times and normal/good acceleration at others. Cause Warped or cracked exhaust manifold, broken exhaust manifold studs. Reasons There have been many theses given as to why this happens. Some say that it is simply poor metallurgy on Audi’s part, thus at high temperatures the manifold tries to expand and can not do so, so instead warps and breaks the manifold studs or cracks the manifold itself or both. Another theory is that it is caused by worn or unserviceable gearbox/engine mounts. The idea behind this is that the exhaust down pipe becomes closer to the front cross member and during acceleration/ deceleration or over rough ground the down pipes hit the cross member and the resulting shock causes all of the damage. My theory Quite honestly I don’t know The simple fact is Audi spent a lot of time and money designing and developing this car but even clever people make mistakes. Also I have fixed around two dozen exhaust manifolds and of these only 4 had bad engine or gearbox mounts To put it straight if the mounting are worn on the O/S of the engine then replace them whilst the exhaust is out of the way Remedy Firstly disconnect the earth lead of the battery As you will be working over the top of both the starter motor and the alternator make sure you have the codes for stereos etc first, or use a memory saver device. Remove the inlet manifold, watch how you do this