One of the first things that can go wrong on an older car is the spark plugs. If you don’t replace them with better quality plugs, your old car may not start anymore.
It’s important to know what causes a bad spark plug, and how you can fix it if you have transmission problems or when you first start your car.
What causes a bad spark plug, and how to fix it?
Is It Possible That A Bad Spark Plug Can Cause Transmission Problems?
Good spark plugs don’t directly cause transmission issues. If the spark plugs aren’t good, they might deliver less Torque to the transmission.
This prevents the transmission from shifting gears which can cause your car to run rough with less power.
The spark plugs and transmission are not connected. The transmission is connected to the wheels while the spark plugs are connected to the engine.
It is probably not a bad spark plug if your vehicle is having transmission problems. It is a good idea to check out what is causing your issues with your vehicle.
The most likely cause of transmission problems is either a faulty wiring harness or something else entirely.
If you have bad spark plugs in your car, we strongly recommend that you replace them with higher-quality ones.
The new rule of thumb is that iridium spark plugs last twice as long as standard, but the current price difference makes it hard for most people to afford.
What Causes Bad Spark Plugs?
Most people think that only high-quality spark plugs will get their vehicles running smoothly, but the truth is more complicated than that.
There are two different types of spark plugs: iridium and Platinum-iridium. Platinum plugs are more expensive than iridium plugs, but they are the more common of the two.
The real problem with spark plugs is that most people don’t know what causes a bad spark plug, which is why Platinum-iridium is slightly better.
Carbon fouling is the biggest reason for a bad spark plug. When you remove the insulation from your wire harness in your car, you expose the wires to a lot of gunk.
They get exposed to engine heat where they get worn and dirty. When the spark plugs are next to the wires, they have to work hard for the engine to work.
I know this might sound obvious, but you can see your plugs get black from carbon fouling.
One of the most common causes of bad spark plugs is overheating, if spark plugs start to overheating they cause the electrodes to get damaged more quickly.
This causes the plug gap to be out of alignment and prevents electricity from flowing smoothly.
If you install low-quality spark plugs in your car, you can cause damage to the engine.
Is It Possible for a Spark Plug Misfire To Cause Transmission Problems?
No, a misfire will not cause problems. Since a misfiring engine makes the car lose power, it will make it harder for the transmission to shift up and down, but it doesn’t damage it.
What Causes Transmission Jerk?
Low transmission fluid is one of the biggest reasons for an automatic car to jerk.
The transmission fluid needs to move smoothly through the system to transfer the Torque from the Engine to the Wheels.
A problem with your transmission fluid can cause a jerking feeling when you want to take off or a bucking feeling when you are at higher speeds.
The most common cause for jerking is damaged clutches, worn gear synchros, or damaged main shaft.
If you are having transmission problems with your car, we recommend that you take it in for a professional inspection.
A professional will be able to replace the transmission at a very low cost if it is worn out. It is also necessary to replace fluids if they are low.
How to Diagnose a Bad Transmission?
A bad transmission can have the same symptoms as a mechanical breakdown.
If your car jerks when you drive through a parking lot, or it clicks out of gear, it is most likely transmission problems.
It may be necessary to take your car to a mechanic if transmission issues are difficult to identify. If the transmission is bad, a proper inspection will tell you.
If you have other issues with your engine that is causing it to misfire and jerk, a professional will be able to take a look at your vehicle and diagnose where the problem is coming from.
How Can I Avoid Spark Plug Issues?
It is recommended to change spark plugs at approximately 40,000 miles or as instructed in the owner’s manual to avoid getting into this mess.
If the distance between the center and side electrodes is greater than 40 thousandths of an inch, then you should change the spark plugs.
Misfiring can be diagnosed by plugging in an engine misfire diagnostic device and looking for engine misfire codes, however, most codes are only given by the engine when a certain number of parameters are met and, in several instances, misfiring starts happening before the ECU trips any code.
When changing spark plugs, it’s always a good idea to stick with original equipment manufacturer plugs, as they are made to provide optimum performance, and therefore it’s better to buy them from a local store.
The owner’s manual says to change spark plugs when the car is cold and tighten them when the car is hot.
It is always a good idea to take proper care of your car as it helps in avoiding a variety of problems and you may not encounter any kind of engine misfire if you do all your car maintenance in time.
Truck driver by profession, automotive lover by heart. Ricky is the main publisher and editor at Truckile.com sharing his life-long knowledge and experience in the auto industry and truck driving!