Engine Repair

Typically, overheating occurs when something in the cooling system isn’t working or the engine has lost its coolant (antifreeze). Modern engines require coolant to absorb heat, as air alone is not enough to cool them. Common causes include:

You should immediately get off the main highway or street. If the gauge enters the red zone, it can cause permanent engine damage. Find a safe place to shut the vehicle off and have it towed to a repair shop.

This is usually due to an airflow issue. When driving at highway speeds (60–80 mph), the force of the speed pushes plenty of air through the radiator. In traffic, you rely on electrical fans to pull air through; if a fan is broken, the engine will overheat as soon as the vehicle slows down.

Yes, low coolant can cause major engine damage because the engine has no way to stay cool. Low coolant is often a sign of a leak, either externally on the ground or internally where it is being burned off inside the engine.

Continuing to drive an overheating car will likely cause catastrophic, major damage. You may end up needing to replace the top of the engine or the entire engine.

A mechanic can perform an “engine block test” to check for internal damage. If the vehicle was severely overheated, it may not even turn on or run anymore.

Performance drops for several reasons:

• Computer Intervention: Modern car computers will automatically reduce performance to try and save the engine from destroying itself.
• Mechanical Issues: High heat can throw off timing components or cause fuel to vaporize (turn into gas) before it even reaches the engine.

• Sweet Smell: Engine coolant has a very sweet smell that is noticeable even if the leak is small.
• Fluid Colors: Look for slightly oily, water-like fluids on the ground that are green, orange, red, or blue.
• A/C Issues: If your air conditioning stops working properly, it may be a sign the engine is overheating.

Yes. A blown head gasket is typically caused by major overheating. The heat creates pressure that blows a hole in the gasket between the upper and lower parts of the engine. Signs include coolant leaking into the engine or steam coming out of the tailpipe.

Preventative maintenance is the best way to avoid overheating. Key steps include:

• Changing coolant at the proper mileage (typically every 30,000 miles) to prevent it from getting “gummed up”.

• Keeping the system maintained so leaks or airflow problems don’t start in the first place.

You should have it checked at least twice a year and definitely before any long road trips. A professional inspection should look at coolant levels, the condition of rubber hoses, and signs of leakage around the radiator or water pump.

Anytime an overheating issue occurs, it should be inspected by a professional.

Important Safety Warning: Never take the cap off the radiator or the overflow bottle when the engine is hot, as the coolant can burn you badly. Have the car towed to a shop instead.

Drivers typically experience running issues where the vehicle feels hesitant or runs rough. This may involve the car struggling, shaking, or simply not “purring” as it should. While these symptoms are sometimes accompanied by a check engine light, that is not always the case.

The most common early warning signs include:

• Check Engine Light: Modern vehicles are designed to trigger this light often before a driver can even feel a physical problem.
• Poor Performance: Hesitation when accelerating from a stoplight.
• Starting Issues: Hard starting or slow cranking in the morning, sometimes followed by a rough idle until the engine warms up.

Engines have many moving parts that can cause noise, but a frequent cause, especially in hot climates like Arizona, is using the wrong fuel. If a vehicle requires high-octane fuel (like 93 octane) and is filled with a lower grade during the summer, it can cause knocking. Addressing these noises early can prevent major damage.

Rough running or shaking is a signal that the engine is not receiving the proper balance of fuel, air, or spark. Potential causes include:

• Ignition System: Worn-out spark plugs or a need for a tune-up.
• Fuel Delivery: A failing fuel pump that isn’t providing enough pressure.
• Air Flow: A plugged air filter that is starving the engine of air and causing it to “chug”.

A loss of power is usually related to the “burn” process, which requires fuel, air, and spark. Common culprits include:

Dirty Fuel Injectors: Just like a showerhead getting plugged with calcium, injectors can get carbon buildup, causing them to drip instead of spray efficiently.

Plugged Filters: A clogged fuel filter or air filter prevents the engine from getting the volume of materials it needs to create power.

Ignition Wear: Spark plugs or other ignition components that need servicing.

It is not recommended, as an engine that is struggling could shut off unexpectedly, creating a safety hazard on the freeway or leaving you stranded in extreme heat. If your check engine light is flashing, you should stop driving immediately and get the vehicle to a mechanic.

Misfiring is typically caused by issues in one of three areas:

• Tune-up Needs: Worn spark plugs, wires, or failing ignition coils.
• Fuel Pressure: A fuel pump that isn’t delivering enough pressure to the engine.
• Air Control: A plugged air filter or a malfunctioning system that regulates air intake

The light is part of the “onboard diagnostic system,” acting as a warning system for the car’s computer to tell you something is wrong. It functions much like a human body feeling an ache or pain to signal that a check-up is needed.

Minor issues can quickly spiral into much more expensive repairs. For example, ignoring a faulty fuel injector (a few hundred dollar fix) can lead to excess fuel dumping into the exhaust and destroying the catalytic converter (a few thousand dollar fix).

A true diagnostic is more than just reading a computer code. It involves:

• Technician Testing: A specialist physicaly tests components, checks fuses, and unplugs parts to see how the engine reacts.
• Parameter Review: Analyzing how fuel is being delivered and how the engine is performing in real-time.
• Pinpointing the Root Cause: Distinguishing between a “bad sensor” and a simple broken wire, which prevents you from buying unnecessary parts.

Catching a problem early stops it from becoming “progressive”. A noise caused by one worn part might cost $800 to fix. If ignored, metal shavings from that part can distribute through the entire engine, eventually requiring a total engine replacement.