This can be caused by an exaust leak close to to your engine. Breathing exaust fumes can be harmful, get this checked out by a machanic.
You can smell exhaust because your exhaust pipes and exhaust system has worn out. As a result, the exhaust and carbon monoxide it contains leaks inside the van. Soon, it will not be a problem because the carbon monoxide will have killed all of you.
Since this morn my car has started shaking and not functioning properly. I can also smell a burning smell coming through the fans and the boot? Could this be the Exhaust?
exhaust is pretty easy to smell. If you smell it, then you likely do, also check the rear end of the car for possible places where the exhaust can get into. a battery powered carbon monoxide detector will also work
most of the time you will smell a rotten egg smell if its bad, or if you hear a rattling noise coming from your exhaust
A smell coming from a reverse cycle air conditioner may be a signal that the filter needs to be cleaned. A smell like engine exhaust might be present if the air conditioner motor is in need of repair.
I would start by checking any leaks in your exhaust and fuel filter area, if there is any leaks throughout the exhaust the smell of gasoline or exhaust may come through into the interior.
An engine oil leak that drips or runs onto the hot exhaust and the fumes find their way into the fresh air intake under the cowl area.
EGR Valve stuck open
Could be overheated coolant or just leaked oil burning off your exhaust headers
There isn't much a person can do to stop the stinky smell of exhaust from the muffler. This smell, sometimes like sulphur or rotten eggs, is a by-product of the fuels burned.
Ur exhaust....
Check exhaust system for leak i.e. Donut gasket, exhaust manifold, EGR valve