O'Fallon Auto Repair

The Silent Engine Killer: Unmasking Carbon Coking and How to Stop It If you’re a driver in O'Fallon, Missouri, you know our roads can be a mix of scenic country drives and the stop-and-go hustle on I-64. Your vehicle’s engine works hard through it all, but there’s a silent, sneaky threat that can rob it of power, efficiency, and its long-term health: carbon coking. You might have heard the term, especially if you own a direct-injection engine (which is most modern vehicles). But what exactly is it, and why should you care? As your local automotive experts at Hillside Auto Repair, we’re pulling back the curtain on this common issue to help you protect your investment. What in the World is Carbon Coking? Imagine the inside of your engine’s combustion chamber. It’s a place of extreme heat and pressure where fuel and air mix and ignite thousands of times every minute. Over time, this process can leave behind h ... read more

Lifter Tick: The Annoying Click That Demands Your Attention You're sitting in your driveway in O'Fallon, the engine is idling, and you hear it: a persistent, rapid tick-tick-tick-tick coming from under the hood. It's not a loud knock, but it's too rhythmic to be normal. Your first thought might be, "Is this serious?" Welcome to the world of lifter tick, one of the most common, and often misunderstood, engine noises. Before you imagine your engine scattering itself across I-70, take a deep breath. At Hillside Auto Repair, we diagnose lifter tick on a regular basis. Sometimes it's a minor issue; other times, it's a warning sign. Let's demystify this annoying sound, explain what's happening inside your engine, and what you should do about it. What Are Lifters and What Do They Do? To understand the tick, you need to know the lifter's role. Think of your engine’s valve train as a com ... read more

The Rise and Fall of the Air-Cooled Engine: A Nostalgic Look at a Simpler Time There’s a distinct, mechanical symphony that car enthusiasts can recognize instantly—the distinctive clatter and whir of an air-cooled engine. For decades, this was the sound of innovation, from the humble Volkswagen Beetle puttering down a street to the roar of a Porsche 911 on the racetrack. The air-cooled engine was a marvel of simplicity, but like many great technologies, its time eventually passed. At Hillside Auto Repair in O’Fallon, we have a deep appreciation for the entire history of the automobile. Understanding where we’ve come from helps us better service the vehicles of today and tomorrow. Let’s take a journey through the rise and fall of the air-cooled engine, a true icon of automotive engineering. The Technology: Simplicity Itself The core principle of an air-cooled engine is brilliantly straightforward: use air, not ... read more

The Dog Clutch: The Brutally Effective Heart of Your Manual Transmission In the world of automotive engineering, most components are designed for smooth, quiet, and seamless operation. But there's one component in many manual transmissions that is, by design, the complete opposite: the dog clutch. Its name might sound odd, but its purpose is pure, unadulterated performance. If you've ever driven a high-performance car with a lightning-fast, rifle-bolt shifter, you've experienced the work of a dog clutch. For driving enthusiasts in O'Fallon who appreciate the mechanical connection of a manual gearbox, understanding this component reveals why some transmissions feel so incredibly direct and robust. Let's dive into what makes it so special and so demanding. What is a Dog Clutch? The "Clunk" You Can Feel First, let's clear up the name. It's not named after man's best friend, but rather the "dog teeth&q ... read more

What Engine Knock Is and How Your Car Fights Back You’re accelerating up an on-ramp to I-70, your engine is under load, and then you hear it, a rapid, pinging, metallic rattle from under the hood that sounds like a handful of marbles being shaken in a tin can. This isn't a normal engine sound; it's the sound of self-destruction. This is engine knock (or detonation), and it's one of the most destructive forces your engine can experience. For drivers in O'Fallon, where highway merges and towing are part of daily life, understanding knock is key to protecting your investment. At Hillside Auto Repair, we know that the most important battles your engine fights are the ones you never hear, thanks to a tiny but mighty guardian: the knock sensor. What is Engine Knock? The Unwanted Explosion To understand knock, you first need to understand normal combustion. In a healthy engine, the spark plug ignites the air-fuel m ... read more