If there is a sweet smelling white cloud following behind you at all times, you may have a bad head gasket. Typically head gaskets fail when the head and the engine expend at different rates, and the gasket can't seal the newly expanded gap. This issue is made worse on some motors which use an iron cylinder block and an aluminum head.
What does a car sound like with a blown head gasket?
If the head gasket fails in such a way it allows the compressed air/fuel to escape, the compression of that cylinder is reduced. This loss of compression results in a rough running engine and a notable reduction in engine power. This sort of failure typically is accompanied by a sound like an exhaust leak.
Can you test a head gasket?
First, you can try a pressure test of your cooling system. If the pressure decreases over time, it is an indication that you have a leak somewhere. If you cannot find the leak externally, chances are you have a head gasket leak. You can also try performing a compression test of your engine to find a head gasket leak.
How do you know if you need a new head gasket?