#2647: Service With a Smile
The Best of Car Talk
#2647: Service With a Smile The Best of Car Talk · Jun 13, 2026
#2647: Service With a Smile

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#2647: Service With a Smile
Concept

changes the emissions of your car

They’re talking about reducing or transforming what comes out of the car’s exhaust. The device is meant to make the exhaust less polluting by changing what’s in it.

Term

microwave emissions converter

It’s a device that tries to clean a car’s exhaust using microwave energy. The idea is to change the exhaust gases so they become less harmful.

Term

5,000 degrees Kelvin

Kelvin is a scientific way to measure temperature. 5,000 Kelvin means the exhaust gets heated to an extremely high temperature.

Term

industrial grade diamonds

These are diamonds meant for industrial tools, not for jewelry. The claim here is that the exhaust carbon could be turned into diamond material.

Honda Accord
Car

Honda Accord

The Honda Accord is a regular passenger car meant for everyday driving. The podcast mentions a 1996 Accord LX with over 100,000 miles, which is a lot of use for a car. Stories like this usually focus on what happens as the car gets older and how it holds up.

Term

engine miss

An engine misfire means the engine doesn’t ignite the fuel in a cylinder the way it should. When that happens, the engine can shake and the car may feel like it’s jerking. If it keeps happening, it can also cause loud noises or strong vibrations.

Term

spark plug

A spark plug is what makes the gasoline engine “light off” the fuel at the right moment. If it’s not sparking properly, the engine can run unevenly and feel like it’s shaking or jerking. That uneven running can also make the car feel like it’s getting nudged or lurching.

Term

misfiring

Misfiring is the condition where a cylinder fails to ignite during its power cycle. Because the engine’s torque output drops during the misfire and returns when it fires correctly again, the car can feel like it’s being nudged or surging. In the segment, the host ties misfiring to repeated “boom, boom” bumps and a jerking sensation.

Term

exhaust system

The exhaust system is the set of parts that carries the engine’s fumes out of the car. If the engine is shaking a lot, those vibrations can travel to the exhaust parts under the car. That can make loud bangs or booming noises.

Term

crankshaft

The crankshaft is the main rotating part inside the engine that turns the pistons’ motion into the motion that drives the car. When the engine misfires, the power delivery changes from one crankshaft cycle to the next. That’s why the car can feel like it’s jerking or surging repeatedly.

Term

clutch

The clutch is the pedal/part you use to smoothly start moving in a manual car. If it makes clacking noises when you let it out, something in the clutch or drivetrain may be worn or not adjusted right.

Term

RPMs

RPMs tell you how fast the engine is spinning. They’re saying they have to rev the engine higher than normal to get the car moving without the clunking noise.

Term

stall

A stall is when the engine dies and the car stops running. Here, if you don’t give the engine enough revs before letting out the clutch, it can’t keep turning and it shuts off.

Term

engine misfire

An engine misfire means the engine doesn’t burn fuel correctly in one or more cylinders. The result can be rough running or hesitation, like the car feels like it’s not pulling smoothly.

Term

running very rich

Running rich means the engine is getting too much fuel compared to the air. That can make the engine run rough and burn dirty, and it can be triggered by certain driving situations.

Term

running too rich

It means the engine is burning too much fuel compared to how much air it’s taking in. When that happens, the spark plugs can get dirty (fouled), and the car may run rough. The car tries to fix it automatically, but sometimes the sensors can make it worse.

Term

fouling the plugs

Spark plugs can get dirty from combustion byproducts. When they’re dirty, they don’t ignite the fuel-air mixture as well, so the engine can run poorly. Excess fuel can cause this.

Term

oxygen sensor

The oxygen sensor checks what’s coming out of the exhaust and helps the car decide how much fuel to add. If it’s reading incorrectly, the car may add too much fuel (or too little), which can make the engine run badly. That’s why a bad sensor can cause mixture problems.

Term

leaning out the mixture

Leaning out means the car is trying to use less fuel for the same amount of air. The computer does this to keep the engine running cleanly. If the sensor is wrong, it can lean the mixture too much and cause problems.

Term

tune up

A tune-up is a service meant to get the engine running right again. It often includes things like checking or replacing spark plugs and making sure key sensors and settings are correct. Mechanics suggest it when the car starts running rough or acting up.

Term

38,000 miles

They’re using the car’s mileage to say it’s about time for routine maintenance. Some parts wear out gradually, and around this kind of mileage a tune-up may be due. It’s more of a “when to check” clue than a diagnosis by itself.

Ford Explorer
Car

Ford Explorer

A Ford Explorer is a popular SUV. Here, the story is about the transmission fluid vanishing and the car acting like it’s slipping, which usually means something is wrong in the transmission system—either a leak or an internal problem.

Term

transmission fluid

Transmission fluid is the liquid that helps the transmission work smoothly. If it keeps running out, the car may shift poorly or slip, and it can also mean the fluid is going somewhere it shouldn’t be.

Term

blue smoke

Blue smoke usually means the engine is burning oil. That’s a clue something is worn out or leaking internally, not just a normal exhaust smell.

Term

oil

Oil is what keeps the engine parts from grinding against each other. If the oil level keeps rising by itself, it can mean something is mixing into the oil—like another fluid leaking into the engine.

Term

transmission cool line

Automatic transmissions use fluid to work. Some cars route that fluid through a small cooler to keep it from overheating, using lines/hoses. If a line leaks, the fluid can end up where it shouldn’t.

Term

crank case

The crankcase is the lower part of the engine that houses the crankshaft and collects oil. If something like transmission fluid gets into the crankcase, it can dilute the engine oil and cause lubrication problems.

Term

cooler tube

A cooler tube is a line that helps move transmission fluid through a cooler so it doesn’t get too hot. If it corrodes or leaks, you can get smoke and transmission problems.

Term

corroded

Corroded means the metal is rusting or breaking down from chemicals and moisture. If a transmission line corrodes, it can start leaking and cause smoke.

Term

head gasket

The head gasket is a seal that keeps different engine fluids and gases from mixing. If it fails, you can get smoke and other serious engine problems that usually need a mechanic to fix.

Term

vacuum modulator

On some older automatic cars, a vacuum modulator helps the transmission shift smoothly using engine vacuum. If the inside diaphragm breaks, transmission fluid can leak where it shouldn’t, which can cause smoke and missing transmission fluid.

Term

tranny fluid

Tranny fluid is the special fluid an automatic transmission uses to do its shifting. If it leaks out, you can get smoke and you’ll notice the transmission fluid level dropping.

Term

dipstick

A dipstick is a simple tool you pull out to check how much fluid is in the engine. If it’s overfilled, there can be too much oil, which may cause smoke and other problems.

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