The Car Repair Experts Answering Any Car Question You Throw At Us
Under The Hood show
The Car Repair Experts Answering Any Car Question You Throw At Us Under The Hood show · Jun 17, 2026
The Car Repair Experts Answering Any Car Question You Throw At Us

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The Car Repair Experts Answering Any Car Question You Throw At Us
2014 GMC Sierra 1500
Car

2014 GMC Sierra 1500

A GMC Sierra 1500 is a full-size pickup truck. The caller is saying their 2014 model has problems with ABS, which is the system that helps prevent the wheels from locking up during hard braking.

Gmc Sierra
Car

Gmc Sierra

The GMC Sierra EV is a pickup truck that uses electricity instead of a traditional gas engine. The podcast mentions it in the context of a truck having ABS problems—ABS is the system that helps prevent wheel lock during braking. If ABS isn’t working correctly, braking can feel different and may be less safe.

Term

wheel speed sensor

A wheel speed sensor is a small sensor near each wheel that tells the car how fast that wheel is spinning. If one sensor stops working, the car can get confused and may activate safety systems like ABS.

Term

scanner

A scanner is a diagnostic device you plug into the car to read error codes and see what sensors are doing. It can tell you which sensor is failing instead of guessing.

Term

tone ring

The tone ring is a patterned metal ring near the wheel that the sensor reads. If it’s damaged or the signal is weak, the sensor may stop reading correctly, especially at low speeds.

Term

RPM

RPM is a measure of how fast something is spinning. Here, they’re saying the sensor problem shows up more when the wheel is turning slowly.

Term

ABS

ABS is the system that helps prevent your wheels from locking up when you brake hard. If the car thinks a wheel speed sensor is wrong, ABS may kick in even when you’re not braking as hard, and the pedal can feel different.

Term

body harness

The body harness is the vehicle’s main wiring network that routes signals between sensors and the car’s control modules. A broken wire between the wheel hub sensor and the body harness can cause the wheel speed sensor to drop out.

Term

four wheel drive

Four wheel drive means power goes to all four wheels. When the car is lifted, that lets you check each wheel’s speed sensor by watching which one stops reporting.

Term

hoist

A hoist is a lift in a repair shop that raises the car off the ground. It’s used here so the wheels can spin while they check the sensor readings.

Brand

Dormans

Dorman is an aftermarket parts brand known for replacement components, including wiring harnesses and sensors. In this segment, the host mentions Dorman’s products as the source for the sensor and harness repair parts.

Term

heat shrink connectors

These are special electrical connectors that get tighter and seal up when you heat them. They help keep the wires connected and protected after a repair.

Term

hub

The hub is the part the wheel mounts to. In this case, it also contains parts of a sensor system, so if the hub’s internal components fail, the car can act up in a repeatable way.

Term

ceramic magnet

A ceramic magnet is a small magnet inside a sensor or wheel-related component. If it cracks, the sensor can stop working correctly, and the problem can show up again and again.

Term

brakes

They’re talking about the brakes acting up right before the car comes to a complete stop. The fact that it happens at the same moment every time can help narrow down what part is causing it.

2004 Volvo S60
Car

2004 Volvo S60

This is a 2004 Volvo S60. The problem being discussed is the car’s ignition system—things like the spark plugs and ignition coils—which can cause misfires and trigger warning lights.

Term

ball failure

The phrase sounds like a dashboard warning message. The important part is that it’s happening along with misfires and engine codes, which usually points back to ignition components.

Term

misfire

A misfire means one cylinder isn’t firing correctly. That can make the engine run rough and can turn on the check engine light.

Term

spark plugs

Spark plugs make the spark that lights the fuel in each cylinder. If they’re worn out, the engine can misfire and run poorly.

Term

coils

Coils are what create the strong electrical voltage needed for the spark plugs. If a coil is failing, the engine can misfire and the check engine light can come on.

Term

ignition circuit

An ignition circuit code means the car thinks there’s an electrical problem related to the ignition system. If misfires are also happening, it often means a coil or its wiring is failing.

Term

coil failure

A coil failure means the ignition coil can’t produce the correct high voltage reliably. When coils and their boots degrade, they can break down electrically and cause arcing, leading to random or intermittent misfires.

Term

boots

The boots are the protective covers on the ignition coils. If they wear out, electricity can leak or arc, which can cause the engine to misfire randomly.

Term

arc to ground

“Arc to ground” means the electricity is taking the wrong path. Instead of firing the spark plug correctly, it can jump to a grounded part and cause misfires.

Term

tune up

A tune-up is when you replace or service key parts that help the engine run correctly. Here, they’re talking about replacing ignition parts like coils and spark plugs.

Term

wattages

A bulb’s wattage is how much electricity it uses. If you put in the wrong wattage, the car may think something is wrong and turn on a warning light.

Term

lamp out warning

That warning means the car thinks one of your exterior lights isn’t working. Sometimes it’s not the bulb being missing—it can be the wrong bulb type or wattage.

Company

advance auto parts

Advance Auto Parts is a store where you can ask what bulb your car needs. It helps you avoid buying the wrong bulb number.

Term

dielectric grease

Dielectric grease is a protective coating you put on the bulb socket to keep water out. That helps prevent rust/corrosion so the connection stays reliable.

Term

3157

3157 is a specific bulb “model number” your car expects for that light. If you put in a different number, the light may not work correctly and the car can show a warning.

Term

3057

3057 is a different bulb type than 3157. If the car needs 3157 and you install 3057 instead, the car may still warn you that the light is out.

Term

monitoring system

Your car has a system that checks whether the lights are working. If something about the bulb or connection isn’t right, it can trigger a warning.

Term

resistance

Cars watch the electrical load of a bulb. If the bulb’s wattage is wrong or the bulb is failing, the car sees different electrical behavior and may warn you the light is out. So the warning can be triggered even if the light isn’t completely dead.

99 3.8 Mustang
Car

99 3.8 Mustang

This is a 1999 Ford Mustang with the 3.8-liter V6. The caller says it knocks only when idling, and the discussion points toward parts connected to the engine’s rotation (like the flywheel/flex plate), not the cylinders. That kind of noise pattern helps narrow down where to look.

Term

flywheel

A flywheel is a heavy part bolted to the engine that helps transfer power to the transmission. If a bolt or fastener comes loose, the flywheel can knock against nearby parts. That can show up as a rhythmic knocking sound, often most noticeable at idle.

Term

bell housing

The bell housing is the metal casing that connects the engine to the transmission. It’s where parts like the flywheel/flex plate live. If a bolt comes loose, it can end up trapped in there and make a knocking sound.

Term

torque converter bolt

On an automatic transmission, the torque converter is held in place by bolts. If a bolt loosens, the converter or flex plate can shift slightly and make a knocking sound. That’s why the caller’s idle-only knock could point to these fasteners.

Term

flex plate

On many automatic cars, the flex plate is the part bolted to the engine that works with the torque converter. It flexes as the transmission transfers power. If bolts on it loosen, it can knock—often most noticeable at idle.

Ford F150
Car

Ford F150

This is a Ford F-150 pickup truck from 2013. The hosts are talking about an oil leak issue on this specific truck, so the year and model help narrow down what parts are likely involved.

Part

right side valve cover

The valve cover gasket is a seal that keeps oil from leaking around the top of the engine. If it’s leaking, oil can run onto other parts under the hood.

Part

front timing chain cover

The timing chain cover is a protective housing at the front of the engine. If it’s leaking, oil can escape and get onto nearby parts.

Term

vacuum pump

A vacuum pump makes suction (vacuum) for certain systems on the car. If oil is leaking near it, that can be a sign the leak is affecting parts around it.

Term

AC hoses

AC hoses carry the refrigerant that makes your car’s air conditioning work. If oil gets onto them, it can cause problems for the AC system.

Term

power steering

Power steering helps you steer with less effort. If oil leaks onto power steering lines or hoses, it can lead to steering system problems.

Term

transmission cooler lines

These are the lines that carry transmission fluid to a cooler so it doesn’t get too hot. If they rot and leak, your transmission can run low on fluid and overheat.

Brand

Dorman products

Dorman makes replacement parts for repairs. In this case, they’re used for a vacuum-pump-related fix that the hosts say is common.

Term

valve cover gasket

The valve cover gasket is a seal that keeps oil from leaking around the top of the engine. If it’s leaking, oil can drip down, but sometimes the leak is actually coming from a different part below it.

Term

timing chains

Timing chains keep the engine’s moving parts in sync. If they wear out or stretch, the engine can run poorly or even suffer serious damage.

Term

guides

Guides are the parts that keep the timing chain properly positioned. If they wear out, the chain can move out of place and cause timing problems.

Term

EcoBoost

EcoBoost is Ford’s name for turbocharged gas engines. The idea is to get good power without using as much fuel as a bigger naturally aspirated engine.

Place

SEMA

SEMA is a big auto show where companies show off new car parts and technologies. They’re saying they first saw EcoBoost there when it was new.

F-150 Raptor
Car

F-150 Raptor

The Ford F-150 is a popular pickup truck. The podcast is talking about an F-150 in connection with a specific performance version (the Raptor) and when it was available. That kind of discussion usually relates to what parts or setups were used and when.

Term

fender flares

Fender flares are the extra pieces around the wheel wells. They help cover wider tires and keep dirt and rocks from getting kicked up into the body.

Concept

purpose built for towing

Some trucks are designed specifically to tow heavy loads. If you tow more than they’re meant for, you can overwork the engine and drivetrain and cause failures sooner.

Term

gear ratio

Gear ratio is how the truck’s gears are set up to help the engine pull. For towing, the right gearing helps the engine work efficiently instead of straining.

Term

towing package

A towing package is a factory or dealer bundle of components and calibrations intended to tow safely and reliably. It commonly includes upgraded cooling, wiring/connectors, and sometimes hitch/receiver hardware sized for the vehicle’s rated towing capacity.

Term

AC

“AC” here means your car’s air-conditioning. It’s the system that makes the cabin cool and comfortable.

Term

air in the system

If air gets into the AC system, it can mess up how well the AC works. Over time it can also cause damage that makes parts stick and fail.

Term

things can stick and fail

“Stick and fail” means parts inside the AC can get stuck and then stop working. That can lead to the AC breaking down completely.

Brand

car-part.com

car-part.com is a website that helps you find used car parts. It connects you with recycling yards that sell parts for many different cars.

Term

recycled

Here, “recycled” means the parts come from used cars instead of being brand new. That usually costs less and is better for the environment.

Brand

Road Ready Wheels

Road Ready Wheels sells replacement wheels for cars. The idea is you can get wheels that fit your vehicle without paying dealer prices.

Term

OEM

OEM means “made by the original manufacturer.” OEM-looking wheels are meant to look and fit like the wheels your car originally had.

Term

TPMS sensors

TPMS sensors are the parts that monitor your tire pressure. If you change wheels, you often need to keep using your car’s existing sensors so the dashboard warnings keep working correctly.

Term

agreed value policy

An agreed value policy means you and the insurance company agree on how much the car is worth ahead of time. If the car is totaled, you’re typically paid that agreed amount instead of arguing about the car’s value later.

2018 Crosstrek
Car

2018 Crosstrek

This is a 2018 Subaru Crosstrek. The hosts are talking about towing and how heat builds up in the car, especially in the engine oil and the transmission, and how an oil cooler helped keep temperatures lower.

Part

oil cooler

An oil cooler is a device that helps cool the engine oil. When you tow something heavy, the engine oil can get too hot, and a cooler helps keep temperatures down.

Brand

Mishimoto

Mishimoto makes aftermarket parts, especially cooling upgrades. Here, their oil cooler is being used to help the engine run cooler when the car is towing.

Term

CVT temperature

CVT temperature refers to the operating heat of a continuously variable transmission (CVT). CVTs can be sensitive to heat because their belt/chain and internal fluid conditions affect smooth operation and long-term durability.

Term

towing a camper

Towing a camper means you’re pulling a heavy trailer. Heavy loads make the car run hotter, so temperatures like engine oil and transmission heat matter more.

Lucid Air
Car

Lucid Air

The Lucid Air is an electric car. The podcast is talking about cooling—specifically how at higher speeds there may not be enough airflow to cool a component effectively. If cooling isn’t sufficient, the car may not perform as consistently under harder driving.

Term

E30 fuel

E30 is a fuel mix that’s partly ethanol—about 30% ethanol and the rest gasoline. The exact mix matters because ethanol changes how the fuel behaves in the engine.

BMW E30
Car

BMW E30

The BMW 3 Series is a smaller luxury car that many people buy for a mix of comfort and driving feel. The podcast mentions it because someone is working with a specific type of fuel (E30) and can’t get it where they live, so they used a different mix. That matters because fuel type can change how an engine runs.

2022 6.2 Silverado
Car

2022 6.2 Silverado

This is a 2022 Chevrolet Silverado with a 6.2-liter engine. Since it’s calibrated to run on a specific fuel grade, mixing ethanol blends like E85 to make E30 can be risky unless you know the real ethanol content and how the engine is set up to handle it.

Term

octane

Octane is a rating that tells you how resistant the fuel is to knocking in the engine. If your vehicle recommends a certain octane level, using a different blend can affect how safely the engine runs.

Term

alcohol

Here, “alcohol” means ethanol in the fuel. The problem is that E85 can vary in how much ethanol it actually contains, so your mix might not end up as E30 like you intended.

Term

flex fuel

A flex-fuel vehicle can run on different mixes of gasoline and ethanol. The car is set up to handle changes in how much ethanol is in the fuel.

Concept

sense it and it varies

They’re saying the fuel mix can change at the station, and you can’t tell the exact ethanol percentage just by guessing. To know for sure, you’d need to measure or test it.

Concept

test it with water to pull it apart

They’re talking about a simple at-home style test: adding water to see how the fuel separates. Because ethanol mixes with water differently than gasoline, you can get clues about the blend.

Term

E85

E85 is a fuel mix that’s mostly ethanol—up to about 85%—mixed with gasoline. The exact mix can vary, so the car may not always get the exact percentage you expect.

Term

lead additive

Lead additive is a product you add to fuel to mimic what lead used to do in older cars. It helps protect the valve seats so the engine doesn’t wear out as quickly on unleaded gas.

Term

lead substitute

A lead substitute is an additive made for older engines that used to rely on leaded fuel. It’s meant to protect the valve seats, and you should use it at the exact mixing ratio on the bottle.

Term

valve seats

Valve seats are the contact surfaces where the valves seal in the engine head. If they wear out, the engine can lose compression and run poorly, so additives may be used to help prevent that.

Term

ZDDP additive

ZDDP is an oil additive that helps protect the engine’s moving metal parts from wear. Older engines and certain cam/lifter designs can need it more than modern oils.

Term

zinc substitute additive

This is a type of oil additive that boosts anti-wear protection using zinc-based chemistry. It’s often used when an older engine needs more protection than what today’s oils provide.

Term

metal conditioner

A metal conditioner is an additive you put into engine oil to help protect the engine’s metal parts. The idea is to reduce wear where things rub together under high pressure.

Term

camshaft

The camshaft is a key engine part that helps control when the valves open and close. If it wears out, the engine can run poorly or suffer damage over time.

Term

bearings

Bearings are parts inside the engine that help moving pieces rotate smoothly. They depend on good oil lubrication to avoid grinding and wear.

1965 Corvair
Car

1965 Corvair

The Chevrolet Corvair is a classic Chevy from the 1960s with an unusual engine setup. In 1965, it’s a rear-engine, air-cooled car—so it feels very different from most cars you’d see on the road today.

Term

spider convertibles

“Spider” is a nickname people use for a sporty kind of convertible. It usually just means an open-top car with a particular look, not a specific mechanical part.

2019 Ford Escape 2.5 liter non-eco boost
Car

2019 Ford Escape 2.5 liter non-eco boost

This is a 2019 Ford Escape SUV with a 2.5-liter engine. The speaker is saying it’s not the turbo “EcoBoost” version, which is important because turbo and non-turbo engines can fail in different ways.

Concept

randomly wants to die

When a car “randomly” shuts off, it can be tough for a mechanic to find the cause because it may not happen while the car is in the shop. Often they have to wait for it to fail again or use scan tools to see what’s going on when it does.

Term

Idle in park

This means the car was sitting still with the engine running, and the gear selector was in Park. If it dies while sitting there, it usually suggests a problem that affects the engine at rest, not something that only happens while driving.

Part

alternator

The alternator is what keeps your car’s battery charged while the engine is running. If it’s weak, the battery can run out of power and the car may shut off or refuse to restart.

Term

battery cable

A battery cable is the thick wire that connects the battery to the rest of the car. If that connection is loose or dirty, the car can shut off and then start working again later.

Term

corrosion

Corrosion is rust or buildup on metal contacts. It can make the electrical connection unreliable, so the car may die and then restart later.

Brand

stable

“Stable” is the brand name of the additive they’re recommending. They say it includes a product meant to help stop rust inside the fuel tank.

Term

vapor action

“Vapor action” is an additive that helps protect the inside of a fuel tank from rust. It’s designed to work even when the tank is fairly empty, because it acts in the air/vapor space above the fuel.

Model T
Car

Model T

The Model T is a very old Ford classic. The speaker says they used the tank additive in their Model T because they’d had rust problems inside the fuel tank before.

Tesla My Model
Concept

fuel expansion causing overflow when the tank is full in hot weather

When a steel fuel tank is filled to the brim, heat causes the fuel to expand. That expansion can raise fuel level enough to overflow, especially if the tank was filled when the fuel was already warm.

Concept

prevent rust from moisture

The goal is to keep water from reaching the metal parts of the car. If moisture can’t get up from the floor, the car is less likely to rust.

Term

vapor barrier

A vapor barrier is a plastic sheet you put under a car to stop dampness from coming up from the ground. Less moisture under the car means less rust over time.

2017 Subaru Outback
Car

2017 Subaru Outback

A Subaru Outback is a popular family car that’s known for handling bad weather well. Here they’re talking about what kind of gasoline it can use—especially E15 and E10, which have more ethanol than normal gas.

Term

87

“87” is the octane number on gas pumps. Octane is basically how well the fuel resists engine knocking, and this call is about whether the car can switch from the 87-type fuel to higher-ethanol blends.

Term

E15

E15 is regular gas mixed with 15% alcohol (ethanol). Some cars can use it and some can’t, so the important part is whether your car is designed for that ethanol level.

Concept

fuel compatibility

Fuel compatibility means whether your car is built to safely run the type of gas you want to use. Here they’re checking if E15/E10 is okay for the Outback, not just whether it will start.

Term

E10

E10 is gasoline mixed with 10% alcohol (ethanol). Many cars are designed to run on it, and in this call they’re saying this Outback should handle E10 without issues.

2013 Mercedes E350
Car

2013 Mercedes E350

A 2013 Mercedes E350 is a Mercedes-Benz luxury car. The host is talking about a problem where the engine isn’t firing correctly in certain cylinders, which triggers warning codes and causes drivability issues.

BMW E87
Car

BMW E87

The BMW 1 Series is a small luxury car. In the podcast, it’s mentioned because a person bought an E87 (a specific model generation) and then had repeated problems afterward. That’s a reminder that some used cars can require a lot of repairs if they weren’t maintained well.

Term

fuel trims

Fuel trims are the car’s computer adjusting how much gas it injects. If you change fuel types (like E85 vs regular gas), the computer should adjust to keep the engine running correctly. If it can’t adjust enough, the car may run rough or throw codes.

Term

running very rich

Running rich means the engine is getting more fuel than it needs for the air available. If the mixture is too rich, the car can feel off and may trigger trouble codes. With E85, the computer has to adjust fueling to keep the mix right.

Term

fuel and air

The engine needs the right balance of fuel and air to burn cleanly. Different fuels need different amounts of fuel to match the same airflow. If that balance is wrong, the engine can run poorly or throw codes.

Term

fuel gets richer

“Rich” means the engine is being fed more fuel than it needs. More fuel can make the car run rough or waste gas, and it’s generally worse for fuel economy.

Term

very rich and very poor fuel economy

If the engine is running “rich,” it burns extra fuel. Extra fuel use usually means worse gas mileage.

Term

relearn

“Relearn” means the car’s computer has to re-adjust after something changes. After that, it can again control the fuel mixture correctly.

Term

reprogramming

“Reprogramming” is when the car’s computer software is updated. It helps the car run correctly with the fuel type and settings you’re using.

Term

91 premium

“91 premium” is a type of gasoline with a higher octane number. Higher octane helps prevent engine knocking, and some cars are tuned to use it.

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