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ENGINE MAINTENANCE

Engine maintenance is vital to keep your car or truck operating at peak performance. It also impacts the longevity of your vehicle's engine. Trust the experts at Dennis Hall's Auto Service to help you protect your investment. Call us at 865-690-1151 or visit our shop in Knoxville 37922.

These are some of the engine maintenance services we offer.

Check Engine Light
No one likes to see their car's "Check Engine" light come on. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. At Dennis Hall's Auto Service, we can pull the code and diagnose the problem for you. Give us a call at 865-690-1151 or stop by the shop for our expert assistance.

Fuel Injection
Fuel injection is a system for admitting fuel into an engine. Since 1990, fuel injectors have completely replaced carburetors as the primary means of getting gasoline into the engine. A fuel injector atomizes the fuel by forcibly pumping it through a small nozzle (under high pressure). Failure of the fuel injection system means poor performance and ultimately destroys the engine.

Ignition
Your vehicle's ignition system is responsible for starting the engine by delivering an electrical spark that ignites the air-fuel mixture in the combustion chamber. Issues can involve a worn ignition switch, a faulty ignition coil or broken or corroded wiring. These problems can lead to symptoms like the engine failing to start, intermittent stalling, dashboard warning lights, or even complete power loss while driving.

Ignition Wires & Cables
These vital parts transfer the spark from the ignition coil to spark plugs that ignite the mixture of fuel and air. The mixture starts the engine. Over time, ignition wires and cables get weak and break down. This makes it impossible for the spark to reach the engine cylinders. This results in the engine misfiring. Common symptoms of faulty ignition cables and wires are: poor gas mileage, engine misfires, engine light is on, and engine vibration.

Oil, Lube, and Filter
To keep running smoothly, your car highly relies on oil, lube, and oil filters. Oil helps in lubricating, cooling, and cleaning the internal engine components. With time, motor oil becomes contaminated. Your car needs an oil, lube, and filter change every three months (or 3,000 miles) in order to function optimally.

Spark Plugs
A spark plug delivers electric current to the combustion chamber from the ignition system. Spark plugs that haven't been changed for a long time can cause ignition problems. At Dennis Hall's Auto Service, we have automotive experts who will check and replace your spark plugs. For all your spark plug repair or replacement needs, call 865-690-1151 or visit Dennis Hall's Auto Service today.

Spark Plug Related FAQs


How do you know when a spark plug needs to be replaced?

The most common sign that a spark plug needs replacing is an engine that hesitates during acceleration. Other warning signs may include engine misfires during startup, rough idling, sluggish acceleration, declining fuel economy, and engine knocking.

What else should I replace when replacing spark plugs?

If you're considering having your vehicle's spark plugs replaced, there's a good chance the spark plug wires should be replaced as well. Ignition wires become brittle over time, and worn wires can lead to engine misfires, poor performance, and reduced fuel economy.



Check Engine Light FAQs


What could cause a check engine light to come on?

Come by Dennis Hall's Auto Service and we can diagnose the reasons for a check engine light turning on. It can range from something serious like a faulty catalytic converter or potential engine failure to something simple like a loose gas cap or the need for a routine 50,000- or 100,000-mile manufacturer maintenance service.

Is it okay to drive with the engine light on?

The short answer is no. The longer explanation is that the light may indicate a serious engine problem, and continuing to drive as if nothing is wrong could result in much more expensive repairs. A check engine light means you should have your vehicle inspected as soon as possible by a professional at Dennis Hall's Auto Service in Knoxville.

What is the most common problem with my check engine light?

A loose gas cap is one of the most common reasons a check engine light comes on. However, the best way to determine the exact cause is to have a technician at Dennis Hall's Auto Service read the diagnostic code stored in your vehicle's onboard OBD computer.

What does a solid check engine light mean?

A steady check engine light generally indicates a non-emergency issue that still needs attention. Come by Dennis Hall's Auto Service and we'll help diagnose and resolve the problem before it becomes more serious.

What does an intermittent flashing check engine light mean?

A flashing check engine light is a warning of a potentially severe problem that requires immediate attention. Get your vehicle to an auto repair shop as quickly as possible, or safely park it and arrange for a tow to your preferred repair facility to avoid further engine damage.



To learn more about our Engine Maintenance services, call us at 865-690-1151 or request a quote by clicking below:


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Discover More About Engine Repair Services At Dennis Hall's Auto Service in Knoxville

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Auto Maintenance Services
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Contact Us Today!

Got questions? We've got answers! Drop us a line, give us a call, or even stop by. Our team is eager to help you with any auto repair needs you have. Let's get you back on the road safely and swiftly!

What Our Customers Are Saying

Hands down the nicest people ever.They replace my headlight for free today.For my birthday what a blessing I will use them for everything I need in the future they didn't have to be so kind. Such an amazing place I recommend them to everyone having car trouble go see these guys

, 11/21/2025

I took my 93 Nissan to Dennis Hall back in March because it was idling rough and had them go ahead and do a rear end service on it as well. They did great work and at an adorable price. It is now August and I noticed it looked like my rear end had leaked a little bit and called them to see if I need to schedule an appointment to get it looked at again. They told me to just stop by and they would check it out free of charge to make sure everything still seemed correct. They got me in and out quickly and very pleased they took the time to make sure their work was correct and didn't make me have to pay for another service. I will be going back for all my vehicle needs 10/10 auto shop!

, 08/08/2025

Had an issue pop up when we were traveling on the interstate. We stopped here and they helped us out super quick and were very nice. If I lived in town this would be my mechanic.

, 07/17/2025

Great job fixing air conditioning in Hyundai veloster

, 06/15/2025

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