How To Fix A Burnt Valve


When your car does not start, it is important to check all of the potential causes of failure. For example, if you turn the key and get nothing but smoke, it is advised to test for liquid in the gas tank.

If you pull out the gas cap and there is no stream of fluid, then the engine did not fail due to a burnt valve!

This article will go into more detail about what can happen when valves burn during combustion, how this happens, and some easy fixes to try before replacing the whole thing.

Reminder: It is very important that you do not leave any part of the vehicle unattended while trying to diagnose or fix any issues. Also, make sure that you have adequate transportation ready as something may take longer than expected to be fixed.

Inspect the fuse circuit

how to fix a burnt valve

The first thing you should do in any situation involving a fire is to make sure that the cause has been eliminated. In this case, the cause of the smoke was clearly not coming from under your vehicle or anywhere else within the car.

It also did not come from the battery so making sure those are both good will help you rule out something like a bad connection or corrosion which could be remedied if needed.

Another possible source would be an electrical short caused by someone breaking into your car and stealing everything but the hood. While very unlikely, it is important to check and see if there was anything left behind.

Check the battery

The next thing you should do is check your car’s battery. If it isn’t getting enough charge, the engine won’t start. Make sure that it gets at least twelve volts (the amount of electricity needed to make a good pull) before trying to turn the vehicle on.

After making sure that the battery is okay, test it by placing a piece of paper with a word or number like “test” on it in one of the grooves where the wires come out of the top of the battery. If there is a small spark when you push down on the paper, then the battery is fine and can be used for fixing the melted valve.

If not, then you will need to get a new one! Luckily, batteries are pretty inexpensive these days. Try your best to save as much money as possible by looking around online for tips and tricks to re-buy a new one.

Replace the fuse

how to fix a burnt valve

The first thing you should do if your car is having trouble starting is check the battery. If it’s good, then look at the fuse that controls ignition for the engine. You can usually pull out the old one and replace it with a new one but there are some tricky ones!

The most common type of burnt-out fuse in an internal combustion vehicle is what we call a fuel injection or electronic spark plug fuse. These fuses typically have two wires connected together, one white and one yellow. When the fire goes out, the plastic casing melts down and only the second wire remains exposed.

You may need to take it apart and solder the ends back onto the metal core, but never burn off the whole thing as this could cause the engine to run without enough fuel!

If yours looks like the more expensive types, buy a replacement part online instead of from a dealership.

Replace the battery

how to fix a burnt valve

The next thing you should do is check if the car needs a new battery. A burnt out valve can cause your engine to run, but it will not work properly without an adequate amount of power. If this is the case, then replacing the battery is the first step in fixing the issue!

Some vehicles use one set of batteries for each cylinder whereas other cars have separate ones for each individual intake or exhaust pipe. This article will focus on the latter.

You will need to make sure that you change both the air intake tube as well as the ECT (exhaust control device) box together. These are usually found under the hood adjacent to each other.

Check the polarity of the battery

how to fix a burnt valve

One of the most common causes for a burnt out valve is having mixed batteries or loose wires. If this happens, then either the source of power has too much voltage, not enough voltage, or both.

If there are two sources of power, one must be more powerful than the other in order to make the engine work correctly. In the case where there is not enough voltage, nothing will happen when you turn the ignition on.

In the case where there is too much voltage, the engine will burn up quickly. This can cause serious damage to the vehicle!

It is important to check the battery’s charging state before trying to test the valves. Batteries lose their ability to hold a charge as they age. A new car may have balanced batteries which mean that they all hold an equal amount of electricity, but as the cars use-up, some might run down faster than others.

For example, if you leave your car running with a flat battery for a few hours, it will rapidly discharge and ruin the battery. As the battery ages, some of its components suchas plates and electrolytes break down and waste away, reducing its efficiency.

When looking at the battery, see how many amps it holds per hour. The higher the number, the better the battery will hold a current flow. A good battery should have a reading of at least 2 amp hrs.

Use a different battery

how to fix a burnt valve

The first thing you should do in any situation is evaluate the symptoms and determine if they are serious or not. If they are, then doing something about them is important!

If you feel your car is burning oil more than normal, turn down your engine speed by either pulling over or switching off cruise control (depending on whether it has that feature). This will help prevent excess heat from breaking down the engine’s components.

You can also check out what kind of fluid you have by putting some drops into a glass and looking at it under a light source.

Replace the circuit breaker

how to fix a burnt valve

For most vehicles, replacing the electrical circuit breakers is your best bet for fixing a burnt out valve. These are contained in a case called an “enclosure” or a “container” that you can access by pulling off the car cover.

The enclosure has a sliding door at the top and a side panel with small openings along each edge. You open up these edges to reach the switch within.

Removing the container is tricky since there are usually clips holding it in place. Some require using a screwdriver to pry them free while others have special tools designed just for this purpose. If yours use either of those, do not force them!

You might also need a pair of thin wire cutters to clip off any wires inside the switch. Make sure to never pull on a connected wire or risk breaking something.

Once removed, you should be able to tell which one is the faulty one. The switches all look similar, but some have markings indicating what part of the vehicle they control.

Check the wiring

how to fix a burnt valve

One of the first things you should do if your vehicle will not start is check the electrical system. Make sure all connections are secure, and that there are no loose wires anywhere.

If you find that one wire has come disconnected, reconnect it until your car starts and works properly. It may be necessary to replace this lost connection.

Another possibility is due to poor contact at the battery terminal. You can test this by using bare hands or use a very small piece of tape as a jump lead to see if the battery provides enough power to the rest of the vehicle.

If so, then we recommend replacing the battery! A bad battery will only cause further problems down the road.

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