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I learned to work on my own cars out of budgetary necessity. As a teenager, I could afford neither professional services, nor cars that were new enough to run without the need for regular repairs and maintenance. My grandfather had been a race driver and mechanic for decades, and helped educate me on auto repair and prevented me from making many mistakes during my long learning period. Cars were far less complicated then, and there are components common to vehicles now that weren’t part of the equation three or four decades ago. Many modern cars have a splash guard mounted on the underside of the engine compartment to protect the components under the hood from water, mud, rocks, and other road detritus.
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A missing or damaged engine shield can allow water to intrude in places it doesn’t belong, like around the ignition coil and spark plug wires. If enough water gets in these places to act as an insulator, you might notice a loss of performance, or your car could stop running altogether. Mud, rocks, and debris can also damage radiator fins, fan blades, and other parts under the hood. While it is theoretically safe to drive short distances on clear pavement in good weather without a splash shield in place, road and weather conditions can be unpredictable, and it doesn’t take much to damage your car to the point where it could need an expensive repair.
Fender liners and upper engine shields are also important
This guidance also applies to the liners on the inside of your wheel wells and the plastic shields that sit atop most engines nowadays. If you’re driving through deep puddles or in a heavy rainstorm, enough water can leak in via engine mating surfaces or the air intake to cause hydrolocking, which can be fatal to your engine. You should be opening the hood on a regular basis anyway, to check and change your oil, coolant, and if you need to change your transmission fluid, so it should be apparent if water is getting into your engine compartment.
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It’s also a good idea to pop your head under the front of your securely parked vehicle from time to time to check that your splash shield is intact and mounted securely. You can also turn the steering wheel to the lock point in each direction to check the fender liners. Fender liners and splash shields break easily, so be careful when removing and installing them. You won’t be able to find replacements at most parts stores, either. Salvage yards and dealerships are your best options, but you can find fasteners and removal/installation tools for most vehicles on Amazon. For example, this 35-piece splash shield fastener kit that fits certain Chevy S10 pickups and some Nissan and Infiniti models costs just $6.99.
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