Water leaking through the seals on my 93 mx5, what

There are a couple of things to consider...

First the cabin air intake is generally in a tray that once the engine compartment hood or bonnet is closed should be almost completely isolated from the engine compartment due to the rubber sealing strip and other rubber components. Perhaps some of these are missing or in poor condition. If heater intake water drains are fitted they should be self closing...

In good condition normal smells or fumes should not get past those seals.

The other consideration is where are the fumes coming from? Unless the engine has an exhaust or oil leak or a breather problem the amount of fumes generated to leak into the cabin, even if the sealing isn't in good order, should be minimal.

Hey Mr. T.,
Get a tube of this... cut a small piece off the tip..(you WILL need a caulking gun to get this out of the tube).. and maybe a friend to help pry the seal around the windshield up so you can squirt this sealer COMPLETELY .. and liberally ...around the windshield...let the seal down gently.. and let it dry.. this should seal it!! (let it DRY BEFORE wiping the excess).. https://www.oreillyauto.com/detail/transtar-autobody-technologies-body-tec-5109/chemicals---fluids-16461/glues--adhesives---sealants-19861/windshield-window-repair-17686/adhesive/4502/4749716

You have a leak in the radiator, water pump, a hose, the heater or a head gasket. Check these and see if there is any water coming out of the exhaust or in the sump.
Take off the radiator cap, fill it right up to the neck, start the engine and warm it up. See if there are any bubbles in the top of the radiator, keep it topped up so there is no room in the top tank.
If there are continuous bubbles then there is a leak in the head gasket.

your going to need a steering unit replacement. Go to orielly.com auto parts and look up to see if there is seal. But I doubt it. We never replace seals in steering gears.

check the water pump for leaking

Can you tell us more?
How many miles on the car?
Which side of the engine area? Drips after you park etc?
Oil ever low? If so how often do you ad oil?
Any visible oil on engine and bay components under hood?

likely areas for oil leaks may include depending on model and make:
Oil pan gasket seal.
Oil pressure sending unit.
Oil filter installed dry or over tightened at your last oil change.
Oil drain plug loose or plug gasket needs replacing.
Valve cover gasket needs replacing.
Crank shaft seals need replacing.
Distributor seals need replacing.
RTV gasket sealer beyond expected life and need replacing for other engine components, inspection plates or covers.

Check your door seals VERY carefully next time your car gets wet - you'll probably find that the forward seal is leaking very slightly - the water tends to run down the pillar and onto the carpet. There often are no drips to provide you with a hint as to where the leak is; try running your finger along it to find moisture. Also there is a little 'well' in the upper corner of the seal that tends to trap water when you get in and out of the car - this often gets squeezed into the car but is rarely enough to cause too much of a problem.
Once you've found the problem area, you just have to get the seal replaced!
Good luck, Sherwin

sounds like u have a bad window seal

thread dammaged in head causing spark pug to come loose can fit heli coil to fix thread in head so spark plug wont come loose and leak oil into tube. other places oil can come from to cover plug in oil
remove rocker cover then remove spark plug tube they are screwed into head and clean thread of tube and apply sealant loctite to thread refit to head and may pay to replace seal for top of spark plug tube that is in rocker cover
one of these or both can leak, if tube is tight in head it may not be leaking the top seal is

clean the srea and watch, tracing back to the source. The oil can leak from the front seal, rear main seal,Pan gaske, or come from the top of engine. Chances are greater it's coming from the front because of fan draft. good luck