A car may smell like gas after a tune-up due to a few potential reasons. It could be from a loose or damaged fuel line, improper reassembly of components, or a faulty injector that was disturbed during the service. Additionally, spilled fuel during the process could also cause a lingering odor. If the smell persists, it's important to have the vehicle inspected to ensure there are no leaks or other issues.
There are a few reasons why your car might smell like fish. Fish could have been at one point stored in the car.
my car smells like i have a petrol leak when i turn it on but have no leak underneath the car
Cats spraying your car with urine.
Leaking heater core
If a car begins to smell like rotten eggs and then starts acting like it has bad gas, it may have been filled with the wrong type of fuel. This smell is common when diesel fuel is burned.
It probably has a leak, possibly from the heater core.
look for a leaky fuel line
Your car will not neccessarily smell like Antifreeze if your water pump is going, in my personal experience it sounds like your HEATER CORE is shot. That is what usually makes that smell, unless you spilled some on the engine. Also, if the water pump was going the car would run hot and/or overheat.
One or more cylinders are firing badly or not at all. It needs a major tune-up.
Car exhaust can smell like rotten eggs when the fuel has a lot of sulphur in it.
A car may smell like sweat due to gym clothes, or other workout clothes, being left in the car.
It makes your car smell somewhat new, but be careful as too much will make it smell like a cab, unless of course you want to go for the cab smell.