Engine Misfires & The Dreaded Check Engine Light
Philip Defatta • May 30, 2025
Engine Misfire
Engine Misfires: What You Need to Know
At PROFIX Auto Repair, we've seen our fair share of engine misfires. While they can be caused by a variety of factors, one often-overlooked culprit is high in-cylinder pressure. In this post, we'll explore the relationship between high in-cylinder pressure and engine misfires, and what you can do to prevent them.
What is In-Cylinder Pressure?
In-cylinder pressure refers to the pressure inside the combustion chamber of your engine, where fuel is ignited to power your vehicle. This pressure is a critical factor in determining engine performance, efficiency, and longevity. When everything is working properly, the pressure inside the cylinder is carefully calibrated to ensure optimal combustion.
The Link Between High In-Cylinder Pressure and Engine Misfires
So, why are engine misfires more likely under high in-cylinder pressure? Here are a few reasons:
Increased Stress on Ignition Components: High in-cylinder pressure puts additional stress on ignition components like spark plugs, ignition coils, and fuel injectors. When these components are subjected to excessive pressure, they can become worn out, weak, or damaged, leading to misfires.
Fuel Ignition Issues: High pressure can also affect the fuel ignition process. If the pressure is too high, it can be difficult for the spark plug to ignite the fuel-air mixture, resulting in a misfire. Turbo charged engines, which are very common, have higher in-cylinder pressures and are more sensitive to ignition weakness.
Engine Knock or Pinging: High in-cylinder pressure can also cause engine knock or pinging, which occurs when the fuel-air mixture ignites prematurely. This can lead to misfires, as well as potentially damaging the engine over time.
The Variability of Misfires
One thing to note about engine misfires is that they don't always happen consistently. Some misfires may occur all the time, while others may only happen under specific conditions, such as:
Constant Misfires: These misfires happen consistently, regardless of driving conditions. They can be caused by issues like faulty spark plugs, ignition coil problems, compression problem, or fuel injector clogs.
Intermittent Misfires Under Load: These misfires only happen when the engine is under heavy load, such as during rapid acceleration or when towing a trailer. They can be caused by issues like worn or dirty spark plugs, weak ignition, or fuel mixture problem, etc.
Common Causes of High In-Cylinder Pressure
So, what can cause high in-cylinder pressure in the first place? Some common culprits include:
Carbon Buildup: Carbon deposits on the cylinder walls or piston can increase pressure and lead to misfires.
Incorrect Fuel Octane: Using fuel with too low an octane rating can cause engine knock or pinging, leading to high in-cylinder pressure.
Faulty Fuel Injectors: Clogged or dirty fuel injectors can disrupt the fuel-air mixture, leading to high pressure and misfires.
Worn or Damaged Engine Components: Worn or damaged engine components, such as piston rings or cylinder walls, can also contribute to high in-cylinder pressure.
What Can You Do?
If you're experiencing engine misfires, it's essential to have them diagnosed and repaired promptly. At PROFIX Auto Repair, our experienced technicians can help identify the root cause of the issue and recommend the necessary repairs.
To prevent engine misfires and high in-cylinder pressure, make sure to:
Use the Correct Fuel Octane: Use fuel with the recommended octane rating for your vehicle.
Keep Your Engine Clean: Regular maintenance, such as oil changes and fuel system cleaning, can help prevent carbon buildup.
Monitor Your Vehicle's Performance: Keep an eye out for signs of engine misfires, such as rough idling or decreased power, especially under heavy acceleration.
Conclusion
Engine misfires can be frustrating and costly to repair. By understanding the link between high in-cylinder pressure and engine misfires, as well as the variability of misfires, you can take steps to prevent them and keep your vehicle running smoothly. If you're experiencing engine misfires or other issues, don't hesitate to contact the experts at PROFIX Auto Repair. We'll get you back on the road in no time.
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If you’re shopping for a used Tesla in Norman, Oklahoma, a professional pre-purchase inspection is one of the smartest steps you can take before buying. At PROFIX Auto Repair, we provide thorough Tesla pre-buy inspections to help drivers avoid unexpected repairs and make confident decisions. Electric vehicles like Tesla require a different approach than traditional gas-powered cars. Our experienced technicians understand Tesla-specific systems and know exactly what to look for during a pre-purchase inspection. We carefully evaluate: -Suspension, steering, and braking systems -Tire condition and uneven wear patterns -Underbody and structural components -Thermal Cooling/Heating systems and high-voltage safety checks -Warning messages, fault indicators, and electronic issues -Signs of prior collision damage or improper repairs Many problems with used Teslas aren’t obvious during a quick test drive. Our inspection helps uncover hidden issues that could lead to costly repairs down the road, especially important when buying from a private seller or out-of-area dealer. Located right here in Norman, OK, PROFIX Auto Repair proudly serves Tesla owners throughout Cleveland County and the surrounding area. Whether you’re purchasing a Model 3, Model Y, Model S, Model X, or Cyber Truck our goal is to give you clear, honest information before you buy. Before you commit to a used Tesla, schedule a Tesla pre-purchase inspection at PROFIX Auto Repair in Norman, Oklahoma—and buy with confidence.
Tesla Alignments: Protecting Your Tires from Uneven Wear at PROFIX Auto RepairTesla owners love the performance, but many notice tires wearing out faster than expected—especially uneven wear on the inner edges of the rear tires. This is common on Model 3, Model Y (including the newer 2026 Juniper models), Model S, and Model X. Common causes include: Heavy battery pack adding significant weight & Instant electric torque stressing tires during acceleration and regen braking. Factory alignment specs (often aggressive negative rear camber for better handling and stability) that accelerate inner-edge wear—even when "within spec." Everyday factors like potholes, curbs, or mileage causing slight drifts in toe, camber, or caster. The result? Premature bald spots on the inside, reduced tread life, noisier rides, lower efficiency, and safety concerns. A professional four-wheel alignment makes a big difference. At PROFIX Auto Repair, we use state-of-the-art equipment to check and adjust your Tesla to optimized specs—balancing performance, handling, and longer tire life. Many customers see dramatically reduced wear and better range after our service. Watch for these signs your Tesla needs attention: Uneven or rapid tire wear (especially inner rear edges) -Pulling to one side -Off-center steering wheel -Vibrations or unusual tire noise Don't let misalignment chew through another expensive set of tires. Schedule your Tesla alignment today at PROFIX Auto Repair—we're EV-friendly and ready to keep you safe on the road! Call us at 405-310-2279 or Click Here to book. Your Tesla deserves expert care. PROFIX Auto Repair – Trusted Service for Teslas & All Vehicles.
As the temperatures drop and winter sets in, many drivers start experiencing frustrating car issues that seem to appear out of nowhere. At PROFIX Auto Repair, we've seen a surge in these cold-weather-related problems every year. The good news? Most of them are preventable with a little preparation and maintenance. In this post, we'll cover the most common issues our customers bring to us during the winter months and share tips on how to avoid them. 1. Dead or Weak Battery - Cold weather is the number one enemy of car batteries. Low temperatures can reduce a battery's power by up to 50-60%, making it struggle to start your engine—especially if it's already a few years old. Tip: Get your battery tested for free at PROFIX—we can tell you if it's time for a replacement before you're stranded. 2. Low Tire Pressure - For every 10°F drop in temperature, your tires can lose about 1 PSI of air pressure. Under inflated tires reduce traction, fuel efficiency, and increase the risk of blowouts on icy roads. Tip: Check your tire pressure monthly (including the spare!) and inflate to the manufacturer's recommended levels. 3. Thickened Engine Oil - In extreme cold, conventional oil can thicken, making it harder for your engine to turn over and potentially causing unnecessary wear during startup.firestonecompleteautocare.com Tip: Switch to a lower-viscosity synthetic oil rated for winter conditions. An oil change at PROFIX can make a big difference. 4. Frozen Door Locks and HandlesMoisture gets into locks and seals, then freezes solid, leaving you locked out of your own car. Tip: Apply a silicone-based lubricant to locks and rubber seals to prevent freezing. 5. Wiper Blade Issues - Wiper blades can freeze to the windshield, become brittle, or get damaged by ice buildup, streaking or failing when you need clear visibility the most. Tip: Replace old blades with winter-specific ones and lift them off the glass when parking in snow. 6. Reduced Traction and Getting Stuck - Snow and ice turn roads into skating rinks, leading to skids or wheels spinning without forward progress. Tip: Consider winter tires for better grip, and keep a traction aid like kitty litter in your trunk.Don't Wait Until It's Too Late!Many of these issues can be caught early with a simple winter maintenance check. At PROFIX Auto Repair, our experienced technicians are here to help keep your vehicle running smoothly all season long. Schedule your winter prep appointment today—call us or book online. Stay safe and warm out there! PROFIX Auto Repair – Your Trusted Local Experts for All Seasons
Well, Norman, Oklahoma decided to sprinkle a little Christmas magic on us in December, and by “sprinkle” we mean actual snowflakes the size of tortillas! While the kids are building wonky snowmen and half the town is attempting donuts in the Dollar General parking lot, we’re over here thinking about your poor car shivering outside.Here’s the quick, fun PROFIX Snow-Day Survival Guide:Slow Your Roll, Cowboy – Black ice doesn’t care how tough your truck looks. Ease off the gas, increase following distance, and pretend you’re driving Miss Daisy. Brakes Aren’t Suggestions – Pump those brakes gently like you’re flirting, not stomping like you just saw your ex at Target. Wipers Up, Problems Down – Before the snow hits next time, flip your wipers up. No more doing the ice-chip shimmy at 6 a.m. with a cereal bowl in one hand. Battery Hates the Cold More Than Your Mother-in-Law Hates Your Cooking – Cold weather can sap 50% of your battery’s cranking power. If your car’s been starting slower than a Monday morning, swing by PROFIX. We’ll test it faster than you can say “hot cocoa.” Tires Matter, Bro – If your tread looks slicker than the roads, it’s time for new shoes. All-seasons are cute until they’re ice-skating. Bonus laugh: Yes, someone already brought us a car this morning because “the traction control light looks like a sad face.” It’s okay, we speak fluent car emotions.Stay warm, stay safe, and if your car starts making noises that sound like it’s auditioning for a polar bear documentary, you know where to find us—we’re the warm shop with the coffee that doesn’t taste like regret.Drive slow, Norman. We love you (and your car) too much to see either of you in a ditch.— The PROFIX Crew
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At PROFIX Auto Repair, we're not just fixing rides on the ground—we're powering missions in the air! As a proud volunteer pilot, I team up with Angel Flight, a nonprofit network of dedicated aviators who provide free flights to patients and families facing serious medical challenges. When commercial travel isn't an option due to distance, finances, or special needs, we step in to bridge the gap—flying them to life-saving treatments, consultations, and compassionate care across the country. Every takeoff is a testament to giving back and making a real difference! Want to see our Angel Flights in action? Track us live on FlightAware—the ultimate flight-tracking app and website. FlightAware will show the last flights and scheduled flights. When we are airborne, it will track us live. Follow along from takeoff to touchdown and cheer us on as we soar for those in need. Stay tuned for announcements about our next mission. Have a story of hope or want to support Angel Flight? Drop a comment below—we'd love to hear from you. Together, we're lifting more than just planes. #PROFIXAutoRepair #AngelFlight #VolunteerPilots #FlightAware #GiveBack #AviationForGood
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