Automotive Experts - Don't Just Use The Cheapest Gas Without Knowing What It Is
Under The Hood show
Under The Hood show May 20, 2026
Automotive Experts - Don't Just Use The Cheapest Gas Without Knowing What It Is

Automotive Experts - Don't Just Use The Cheapest Gas Without Knowing What It Is

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49:30
Automotive Experts - Don't Just Use The Cheapest Gas Without Knowing What It Is
2011 Ford Flex
Car

2011 Ford Flex

A 2011 Ford Flex is the exact car the caller has. They’re talking about a serious engine issue where someone says the only real fix is replacing a big portion of the engine.

Term

misfiring

Misfiring is when part of the engine isn’t igniting fuel the way it should. It can make the car run rough and often shows up when a mechanic checks the engine codes.

Concept

certified used option

Instead of buying the most expensive replacement, they’re suggesting a certified used replacement. It’s used, but it comes with an inspection and warranty so you’re not taking a total gamble.

Term

unlimited mileage

Unlimited mileage means the warranty coverage doesn’t depend on how many miles you drive during the coverage period. That matters for engine replacements because the risk of issues can show up after the repair over time.

Part

water pump

The water pump moves coolant so the engine doesn’t overheat. The host is saying that on this engine design, the water pump is inside the engine and if it fails, it can cause serious damage.

Concept

certified used parts

Certified used parts are used car parts that have been checked and approved by a program. That way, you’re less likely to get a part that’s damaged or won’t fit.

Concept

certified auto recycler program

This is a system where salvage yards follow rules to check and verify used parts. It helps make sure the parts are in good shape and easier to rely on.

Term

long block

A “long block” is basically the main engine assembly. It usually includes the core parts inside the engine, but not every outside component like accessories.

Term

cylinder speed

The engine monitors how each cylinder is working. If one or more cylinders aren’t behaving the way the computer expects, it can turn on a warning code.

Term

fuel injected motor

A fuel-injected engine delivers fuel using electronic controls instead of a carburetor. That helps the engine run more consistently and meet emissions rules.

Term

fire code

“Fire code” sounds like the speaker is referring to an engine diagnostic warning code (commonly a check-engine–type code). These codes are generated when the engine computer detects a fault condition and stores it so technicians can diagnose the problem.

350 Chevy
Car

350 Chevy

“350 Chevy” is a classic Chevrolet V8 engine size. The hosts are using it as an example of older engines and how they could run even if things weren’t perfect.

Term

carbon buildup

Carbon buildup is gunk that can collect inside the engine over time. If it builds up on or around the valves, it can prevent them from sealing or working smoothly, which can cause running problems.

Term

leak down test

A leak down test checks how well each cylinder seals. They put air into the cylinder and see where it leaks out—like past the valves or piston rings—so you can tell what part is worn or not sealing right.

Term

intake valve

The intake valve is the door that lets the fuel/air charge into the engine’s cylinder. If it doesn’t seal well, the engine can lose compression and run worse.

Term

exhaust valve

The exhaust valve is the door that lets the burned gases exit the cylinder. If it leaks, the cylinder won’t seal correctly and the engine may not run right.

Term

crankcase

The crankcase is the bottom part of the engine where the crankshaft sits and where oil collects. If air leaks past the valves, it can end up in that area, which the test can reveal.

Term

emission system cleaning

Emission system cleaning is using a cleaner to help remove buildup that can affect how the car controls exhaust emissions. It’s sometimes used when the problem seems related to carbon deposits.

Term

soaking in the cylinders

This is a cleaning method where they add a chemical and let it sit in the cylinder area to loosen carbon. It’s used when carbon buildup is thought to be causing the engine problems.

Term

GDI fuel system service kit

This is a cleaning kit made for direct-injection engines. The goal is to reduce deposits and keep the fuel system working the way it should.

Term

direct injected engines

Direct injection means the engine sprays fuel directly into the combustion chamber instead of into the intake port. This design improves efficiency, but it can also lead to more deposits on intake valves, which is why cleaning products are sometimes recommended.

Term

burn a valve

“Burn a valve” means the engine’s valve gets overheated and damaged. Once that happens, the engine may lose power or even need major work to fix it.

Term

kill the cylinder

“Kill the cylinder” means one part of the engine stops working properly. The car can start running rough, and it can get worse if you don’t fix the cause.

Term

piston

The piston is the moving part inside each cylinder that compresses the air-fuel mixture and transfers combustion force to the crankshaft. If carbon buildup gets severe, the piston crown and surrounding areas can look “nasty,” and the engine can lose efficiency or suffer damage.

Term

dealer

Here, “dealer” means the official store for that car brand. Parts from a dealer usually cost more than other options.

Term

rust

Rust is metal corrosion. On a used car, it can mean the car has been exposed to moisture or hasn’t been cared for, and it can lead to expensive repairs.

Term

diminishing returns

It means you keep paying for fixes, but each new fix helps less than the last one. Eventually, it’s not worth spending more because the car is likely to need bigger problems soon.

Toyota Prius
Car

Toyota Prius

The Prius is a car that uses both a gas engine and an electric motor. That helps it use less fuel than many regular gas cars. People often talk about it because it can have specific maintenance needs as it gets older.

Term

oil change

An oil change is when you replace the engine oil. It helps keep the engine lubricated and cleaner so it can run smoothly.

Term

tread

Tread is the pattern on the tire that touches the road. When the tread is deeper (like on new tires), the car usually grips better and feels safer.

Term

misfire

A misfire is when the engine doesn’t burn fuel correctly in one or more cylinders. That can make the car shake or run rough, and it’s a sign something needs checking.

Term

transmission

The transmission is what helps the car transfer power from the engine to the wheels. If it’s going bad, the car can feel shaky or act weird, even if the tires are new.

Ford Ranger
Car

Ford Ranger

The Ford Ranger is a pickup truck, and the 2004 XLT is an older version. Pickup trucks are built for hauling and everyday driving, but older ones can need repairs over time. The episode mention sounds like the owner is troubleshooting something that happened while someone else used it.

Term

EVAP purge test

EVAP is a system that keeps fuel vapors from escaping into the air. A purge test is basically the car checking that it can “pull in” those vapors and burn them. The host is saying the situation could have triggered that kind of check.

Term

charcoal canister

The charcoal canister is a small EVAP-system part that “soaks up” fuel vapors. Later, the car pulls those vapors in and burns them. If you add too much fuel, it can mess with how well that canister works.

Part

fuel cap

The fuel cap is the seal on your gas tank. If it’s worn out or doesn’t seal tightly, gas fumes can leak and the car can act up or show warning lights.

Company

Motorrad

Motorrad is referenced as a supplier/brand for replacement fuel-cap “closure devices.” The point is that a correct, compatible cap can be a low-cost first fix for an aging fuel cap.

Term

vent valve

A vent valve is part of the vehicle’s fuel tank vapor control system, helping regulate pressure and directing fuel vapors to be processed instead of venting to the atmosphere. If it sticks or fails, you can get drivability problems and evaporative-emissions faults.

Term

system sealed

Cars have to keep the fuel system airtight so fuel vapors don’t leak out. If there’s a leak, the car can run into trouble and the check-engine light may come on.

Term

rich

“Rich” means the engine is getting more fuel than it should for the amount of air. That can cause extra emissions and may show up as a warning light.

Concept

masking a problem

Sometimes one problem can “hide” another, because the car’s sensors and symptoms get confused. You might not notice the real cause until the first issue is fixed.

Term

fuel fill neck tube

That’s the part of the car that the fuel nozzle goes into. If it rusts through, it can cause leaks or let the fuel system not seal correctly.

Term

drive cycles

A drive cycle is basically a “pattern of driving” your car needs to go through so its computer can run checks. Some issues won’t fully clear until the car has been driven enough times in the right way.

Volkswagen ID buses
Car

Volkswagen ID buses

Volkswagen’s “ID” is their electric-vehicle family. Here, they’re talking about electric buses that use that ID branding and why they weren’t moving off lots.

Concept

combustion vehicle

A “combustion vehicle” is a normal gas or diesel car that makes power by burning fuel in an engine. The discussion is about Honda pushing back its deadline for stopping these vehicles.

Concept

plug-in hybrids

A plug-in hybrid can drive using electricity like an EV, but it also has a gas engine if you need it. The point here is that Honda expects to use more of these instead of only fully gas cars.

Concept

frack and extract

“Fracking” is a drilling technique that helps pull oil and gas out of tight rock. The point here is that it could get too costly or difficult to keep producing enough fossil fuel.

Concept

internal combustion engines

An internal combustion engine is the kind of engine most gas cars use, where fuel is burned to make power. The speaker is saying that in the future, it may only work if the fuel isn’t fossil-based.

Term

biofuel

Biofuel is fuel made from renewable organic materials, not from fossil oil. In this discussion, it’s presented as the substitute fuel if fossil fuels become unavailable.

Concept

electric

The host is talking about switching from gas-powered cars to electric cars. The idea is that the change needs more than just new cars—it needs the supporting setup to power them.

Term

infrastructure

Here, “infrastructure” means the real-world stuff needed for electric cars to work—like charging stations and the power system behind them. The point is that you can’t switch to electric cars without building that support.

Term

ethanol

Ethanol is a fuel made from plant-based sources that can be mixed into regular gasoline. It can affect how the engine runs, so not every car is equally happy with every ethanol blend.

Term

biodiesel

Biodiesel is a renewable type of diesel fuel made from plant or animal oils. It can be mixed with regular diesel, but it may act a little differently—especially in cold conditions.

Brand

Tesla

Tesla is a company that makes electric cars. The point here is that Tesla was one of the early big players, and the market changed as more companies joined in.

Renault Wind
Car

Renault Wind

The Renault Wind is a small convertible, meaning the top can open for fresh air. It’s built for short, fun drives rather than hauling. The podcast mention sounds like it’s about how wind and parking position affected the situation.

Ford F150
Car

Ford F150

The Ford F-150 is a large pickup truck. Oil changes are important because the engine needs clean oil to run well. The episode is asking about what the car’s phone app says for when to change the oil.

Term

algorithm

An algorithm here just means the car is using math/rules to decide when maintenance is needed. It looks at how the car has been used, not only the calendar or miles. That’s what makes the reminders vary from driver to driver.

Term

lower cost of ownership

“Lower cost of ownership” means the car is designed to be cheaper to keep and maintain over time. One way is by spacing out maintenance so you don’t have to go in as often. But if your driving conditions are tough, you may still need service sooner.

Term

maintenance frequency

Maintenance frequency just means how often the car tells you to do service. Some cars are set up to recommend it less often to save time and money. But if conditions are rough, you might need to change things sooner than the reminder suggests.

Term

oil life

Oil life is the car’s guess about when your engine oil is getting worn out. It tries to estimate this from how you drive and how the engine runs. The safer approach is to use it as a guide, not the only rule.

Concept

hail damage to collector cars

They’re talking about how hail can dent cars and why older collector cars might seem less affected. The key point is that hail size and wind matter—small hail might not dent, but big hail can.

Term

hail storm

A hail storm is weather where small chunks of ice fall from the sky. If they hit a car, they can dent the metal and crack windows, even if the car still seems to run normally.

Term

sheet metal

Sheet metal is the thin metal skin of the car—like the hood and doors. Hail can leave dents because the ice hits those panels directly.

Term

glass

Here, “glass” means the car’s windows and windshield. Hail can crack them because the ice hits with a lot of force in a small spot.

Term

solar panels

Solar panels are devices that make electricity from sunlight. The speaker is saying the hail knocked out solar panels at a nearby facility, not just cars.

Chevrolet Camaro
Car

Chevrolet Camaro

The Chevrolet Camaro is a sports car. It’s usually the kind of car people choose for a fun driving experience and car events. The podcast mention is mainly about seeing one at the show or gathering.

Term

rodent damage

Rodents can get into a car and chew the wires. That can make the car act weird or not start, and it often requires more than a simple patch.

2008 Chevrolet Impala
Car

2008 Chevrolet Impala

A 2008 Chevrolet Impala is a regular family sedan, but its engine bay has a lot of wiring. If rodents chew the wires, the car may not run right, and fixing it can be tricky.

Term

air box

The air box is part of the intake system that brings air into the engine. If animals nest there, they can cause damage around the intake area.

Term

harness options

“Harness options” refers to the fact that the same model can have different wiring configurations depending on equipment (trim, emissions setup, accessories, and sensor/connector variants). A replacement harness must match those options so the connectors and circuits work correctly after installation.

Term

engine harness

The engine harness is the wiring bundle that runs the engine’s electronics. If you replace it, it has to be the right one for that exact car so the plugs and functions line up.

Part

wiring harness

A wiring harness is like the car’s electrical “wire bundle” that connects sensors, computers, and other parts. If you buy the wrong one, the plugs may not match or the car may not work correctly.

Term

part number

A part number is a unique code that identifies the exact version of a part. Using it helps you avoid buying a similar-looking harness that won’t plug in or match the car’s setup.

Concept

California vs federal emissions fitment

Some cars are wired differently depending on emissions rules. They mention California vs federal versions, and that the California setup can require extra wiring for emissions equipment, so you can’t always swap harnesses freely.

Term

solenoids

Solenoids are electrically controlled “switches” that move a valve. In this case, they’re part of the emissions system, and the wiring for them can change between emissions versions.

Term

air pump valves

Air pump valves are emissions-system parts that help move air where it’s needed to reduce pollution. Different emissions rules can mean different valve setups, so the wiring harness may need to match.

Company

VINmatch Pro

VINmatch Pro sounds like a tool that uses a car’s VIN to help figure out what that specific car is. The hosts say it can compare VINs and show details that help with finding the right information for parts.

Term

option codes

Option codes are codes that describe what features your car was built with. They help you figure out the exact setup so you don’t buy parts that fit the wrong version.

Term

VIN numbers

VIN numbers are like a car’s fingerprint. They can tell you exactly which version of the car you’re dealing with, which helps when you’re trying to find the right parts.

Concept

self-service

A self-service yard is where you go to a junkyard and remove parts yourself from the cars on the lot. Even with tools that help you identify what you need, you still have to pull the part.

Term

active recall

“Active recall” means your car is on a list of vehicles that the manufacturer says has a problem that needs fixing. If it’s still active, the fix is usually covered by the manufacturer.

Term

backup camera

A backup camera shows what’s behind your car on the screen when you go into reverse. It can help prevent accidents when backing up.

Term

recall window

A “recall window” is the period during which a vehicle is still eligible for the recall remedy under the recall program. If the owner misses that eligibility period, the remedy may no longer be covered and the customer could be charged.

Term

AC work

“AC work” means getting the car’s air conditioning fixed or checked. When it gets hot, more people notice problems and bring their cars in.

Term

AC system

Car AC is like a heat-moving machine. It uses a special fluid (refrigerant) to pull heat out of the cabin. If that fluid is low, the AC won’t work well and can get too hot.

Term

refrigerant

Refrigerant is the special fluid that makes car AC work. It’s what carries heat out of the cabin. If there isn’t enough of it, the AC may stop cooling and can be harder on the system.

Term

radiator

The radiator is what helps your engine get rid of heat. In the front of the car, it also sits near the parts that help the AC cool, so clogged areas can make everything run hotter.

Term

condenser

The condenser is the part of the car AC that dumps heat outside. If it’s covered in bugs or grime, air can’t flow through well, and the AC can struggle or stop working.

Term

cabin air filter

Your cabin air filter helps keep the air inside the car cleaner. If it gets clogged, the air conditioner has to work harder and can start acting up. Here, they’re saying a dirty filter can contribute to the A/C freezing.

Term

locks up

If the compressor “locks up,” it means it gets stuck and can’t spin anymore. That usually means the A/C can’t function normally and the repair often involves replacing the compressor. It’s a major failure mode, not a minor fix.

Term

oil in one position

A/C systems use refrigerant and lubricant oil together; the oil needs to circulate to lubricate the compressor and other components. The speaker describes a scenario where oil is held away from the compressor, which can contribute to compressor failure. While the exact mechanism can vary by system, the key idea is that oil circulation matters.

Concept

estimate after disassembly

The speaker emphasizes that accurate repair pricing often can’t be known until the technician takes the system apart and inspects what’s actually failed. Many estimates are incomplete until parts are removed, because hidden damage or additional components may be involved. They also note that an estimate covering the whole system up front can be much higher.

Term

evaporator

The evaporator is the part of your car’s air conditioning that cools the air inside the cabin. If it leaks, the system can lose refrigerant and the A/C won’t work right.

Term

compressor

The compressor is the pump in your car’s air conditioning. If it “locks up” or stops working, the A/C can’t circulate refrigerant, so it won’t cool.

Term

evacuated

Evacuating the A/C means pulling out air and moisture before adding refrigerant back. That helps the system work properly and last longer.

Term

lines off

“Taking the lines off” means disconnecting the A/C hoses/tubes. Mechanics do this to reach the broken part, and it can take time.

Term

85

“85” here means a gas blend with a lot of alcohol (ethanol), usually called E85. Only flex-fuel cars are meant to use it.

Term

flex fuel

Flex-fuel cars are made to handle different amounts of alcohol mixed into gasoline. If your car isn’t flex-fuel, using a higher-ethanol fuel can cause drivability issues or damage.

Term

premium fuel

Premium fuel is a higher-grade gasoline than regular. It’s not just about “better”—it can have different fuel chemistry, and some cars are picky about what they’re designed to use.

Term

E30

E30 is regular gas mixed with about 30% alcohol (ethanol). Not every car can use it—only cars that are built to handle higher-ethanol blends.

BMW E30
Car

BMW E30

The BMW 3 Series is a luxury car, usually a sedan. People may use different types of fuel, and some cars can be designed to use certain blends. In the episode, one person used E30 and the other used regular premium, and they noticed the cost difference.

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