Car Repair and Maintenance

Problems After Changing Spark Plugs: What Can Go Wrong?

Problems after changing spark plugs

Since spark plugs affect so many aspects of the vehicle’s health and performance, changing spark plugs must be a routine maintenance task that is performed often. However, you could still face problems after changing spark plugs.

Your spark plug is very important to your car’s performance. Spark plugs provide the spark that ignites the air or fuel combination. These spark plugs produce an electric arc between the two leads they are connected to. These leads are not in contact with one another, but since they are so near to one another, electricity can pass through the space between them. As a result of this, the spark plug makes a significant contribution to the ignition system of your vehicle.

Since this is the case, it is very important to constantly examine them and to replace them whenever it is essential to do so.

Problems after changing spark plugs

Problems after changing spark plugs

People will replace their spark plugs when they discover certain difficulties and small changes in the condition and performance of their cars. This is why people change their spark plugs. However, some people still experience issues, even though the spark plugs have been replaced. Check below for some of the problems after changing spark plugs:

1. Engine noise

Following the replacement of your spark plugs, you may hear some rattling or banging sounds coming from your vehicle. Additionally, you will hear these sounds if the spark plug is not firing properly.

It will originate from your pistons as well as the combustion, which is not functioning in the ideal manner.

For the pistons to move, they must move at high velocities, and if the spark plugs are not burning properly, the pistons will make these sounds. A faulty spark plug is one possible reason for this problem so ensure you get the best spark plug when replacing the old one in your car.

2. Hard start

Some people have reported that after replacing the spark plug in their vehicle, they are unable to start the car at all, while others have said that starting the vehicle is very difficult. One possible explanation for this is that the spark plug in your engine is malfunctioning and needs to be replaced with a functional one.

3. Poor fuel economy

You may have noticed that the fuel economy of your vehicle is reducing and frustrating. Spark plugs are an important component of a vehicle’s overall fuel efficiency. If you have just replaced your spark plugs, you should have seen an improvement in your vehicle’s overall fuel efficiency instead of a reduction.

4. Reduction in performance

Another problem after changing spark plugs which is experienced by many people is a reduction in their car’s performance. After having your spark plugs replaced, you could find that your vehicle’s performance does not suffer in any way. However, for your engine to operate at its most efficient level, you need to make sure that the spark plugs are working at one hundred percent whenever you accelerate and shift gears.

What should I check after changing the spark plugs?

First of all, you have to make sure that your engine is not operating with a jerky idle. If the spark plug is new and efficient, you shouldn’t have any issues with a rough idle. You also need to determine whether or not you will have difficulty starting your vehicle.

You should not have any more difficulties starting your car after replacing the spark plug. Nevertheless, you should also inspect your engine to see if there are any misfires. An improper ignition in the engine might be brought on by a faulty spark plug.

Therefore, you need to be sure that the replacement spark plugs you purchased are free of any defects. When it comes to the engine, you need to make sure that you check to see whether the engine is surging. Also, ensure you monitor your fuel usage.

You need to change out your spark plugs if your vehicle has poor fuel economy. If you have already changed your spark plugs but your car is still using a lot of fuel, there is likely an issue with either the spark plugs themselves or one of the other components in your vehicle. Check to see whether the performance of your car has a slow acceleration as well.

Can new spark plugs cause rough idle?

Although your new spark plugs can generate a rough idle, the likelihood of this happening is quite low. Per the Car Part, “Spark plugs and the ignition coil are both parts of the ignition system. When they go bad, they can cause rough idling or engine misfires.”

On the other hand, it is not completely out of the question that the spark plugs in question are still malfunctioning or deteriorating.

It is highly recommended that you have it analyzed by a professional if you have any doubts about its efficiency. There is also a possibility that you placed the spark plugs in the wrong manner.

Why does my car shake after I changed the spark plugs?

After replacing the spark plugs in their vehicles, several drivers have reported that their vehicles now shake more than before.

There are a few things that might be causing the shaking in your car. It’s possible, for instance, that the fuel pressures are too low, or that the engine is producing spurious ignitions.

On the other hand, if you have just replaced your spark plugs and you plan to continue using them, you may have faulty spark plugs.

A malfunctioning idle air control valve is another possible cause. It has the potential to make your engine idle more slowly than usual.

Should I reset ECU after changing the spark plugs?

After having their spark plugs replaced, more people are curious as to whether or not they should reset their engine control unit (ECU). Others believe that you should not reset your engine control unit.

After having your spark plugs replaced, you may hear from other individuals that you do not need to reset your engine control unit (ECU).

On the other hand, if you want to reset your ECU, you’ll find that some individuals will say it’s not a terrible idea at all, while others will argue there are no advantages to doing so. If you are going to reset your ECU, however, you need to check that you are not already on a new inspection schedule before you do so.


Can spark plugs change cause a car not to start?

There is a possibility that the spark plugs in your car might prevent it from starting. After replacing the spark plugs in their vehicles, a significant number of drivers have reported that their vehicles are unable to start.

Changed spark plugs now car won’t start what to do?

If you have replaced your spark plugs but your vehicle still will not start, you need to check to see if any plug wires come straight from the coil or the distributor and then down into the plugs, and you also need to ensure that they are linked properly and securely. You can find a picture of your car and examine it to see how the wires are connected and how they are hooked up. It’s possible that you connected the wires incorrectly, both in terms of how and where they were joined.

Final thoughts

Making sure that your spark plugs are replaced with new ones regularly is very important. This is because spark plugs play such an important role in the overall condition and performance of your car.

Although even after changing spark plugs to new ones, some people still complain of experiencing problems after changing spark plugs. Therefore, you need to test the new spark plugs in your engine. Examine the item closely for any flaws or damage before and while using them.

Latest posts by Bernard Juchli (see all)

Bernard Juchli

Bernard Juchli is an experienced racer, mechanic and team owner who trusts Avon Tyres.Bernard is the lead driver and force behind his Big Dog Garage Race Team. He is the General Manager and Chief Mechanic of Jay Leno’s Garage. Bernard and his crew of seven are responsible for all repairs, restoration and fabrication of Jay’s incredible automobile and motorcycle collection.

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