First of All Get a Engine Diagostics and see if there are any problems and fix them from a Prof Machenic If your car has not been tuned then change the spark plug, spark plug wires, fuel line filter. If this does not solve then change the distributer cap. That should solve the basic prolems of Shaking engine. Also check for the engine oil levels from time to time for the exhaust smell. (if car is old do put the engine oil treatmet like MOTOR UP, and other...which are available in the market)
My 3.8 Impala had a slight antifreeze smell from the engine compartment, and was much worse at the exhaust It was also missing, the problem was the upper intake plenum. I know that on this motor it is a common problem, and can quickly progress to the point of the car no longer running. You could have a small leak anywhere that is evaporating before it can drip.
Any exhaust smell in a car cab indicates an exhaust leak somewhere along the line. Th reason you don't smell it while driving is because the air flowing air under the car is blowing the exhaust gasses away before it can rise into the cab. After the car sits for a while, the gasses seep out of the leak, and up into the cab.
A fuel leak. A coolant leak, coolant has a sweet smell. An exhaust leak. A burnt clutch. A burnt rubber smell, from a slipping accessory belt/tensioner or rubber contacting the exhaust. A Moldy smell with the A/C on from a dirty/moldy evaporator. An oil leak, if it is leaking near the exhaust manifold, from say the valve cover. A smell from burnt brakes from a faulty brake caliper. A burnt plastic smell, from plastic melting against the exhaust( wiring loom, or plastic bag on catalytic converter). A. mildew smell caused by a water leak, clogged evap case drain, flogged sunroof drain.
Running the exhaust blower will expel fuel or exhaust vapors trapped in the engine compartment. This is a precautionary step. A visual inspection the engine compartment is also a good habit to get into if you have not started the boat for some time. Things to look (and smell) for in the engine compartment that might tell you something is wrong with your boat before you start it include: fuel or exhaust, water, and broken or loose motor parts.
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