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Lexus NX300 Spark Plugs Replacement Costs
RepairSmith offers upfront and competitive pricing. The average cost for Lexus NX300 Spark Plugs Replacement is $148. Drop it off at our shop and pick it up a few hours later, or save time and have our Delivery mechanics come to you.
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How to Replace a Bad Spark Plug?
For a spark plug replacement, you may need to remove the intake manifold and other components like the ignition coil or spark plug wire. Accessing and removing these parts can be difficult on some vehicles.
Moreover, a bad spark plug replacement job can lead to expensive engine repairs. That’s why it’s best to let a professional mechanic change your vehicle‘s spark plugs.
Consult the owner’s manual on when to change old spark plugs and about the correct spark plugs for your vehicle. It’s a good idea to get the ignition coil and spark plug wires checked when your car gets a spark plug change. You may also get them inspected while going for other maintenance activities, like an oil change service.
But what if they go bad? You should replace faulty spark plugs immediately. A faulty spark plug can result in an engine misfire. Frequent misfires could also lead to a damaged catalytic converter, reduced engine performance and fuel efficiency, and irreversible engine damage.
You may also end up with a dead battery from repeatedly trying to crank your car that won’t start due tospark plugproblems.
What Are the Common Symptoms of Failing Spark Plugs?
Why? Spark plugsfouled with engine oil, fuel, or carbon won’t ignite the air-fuel mixture correctly. This can cause engine misfires and activate the CEL.
However, the Check Engine light can also appear due to spark plug wire or coil pack issues (other than afaulty spark plug).
2. Fuel EfficiencyDrops
Bad spark plugs increase your vehicle’s fuel consumption because they lead to inefficient combustion. In fact, spark plug failure can reduce your car’s fuel efficiency (a.k.a. fuel economy or gas mileage) by around 30%.
Plus, unburned fuel from incomplete combustion will be expelled from the engine and may ignite in the catalytic converter, damaging it.
3. Engine Idles Rough
Under normal conditions, theengineshould idle smoothly. But if your vehicle has a faulty spark plug, you may hear pinging, rattling, or knocking soundsdue to misfires. Ignoring these signs of a bad spark plugcan result in engine damage over time.
4. Car Struggles to Start
Wornspark plugs will struggle to fire your engine, likely stalling it. However, the starting troubles could also be due to a battery problem.
Unburned fuelreaches the vehicle’s exhaust system when a worn spark plug doesn’t ignite the air-fuel mixture properly in the combustion chamber. Consequently, your vehicle’s tailpipe emissions may smell like gasoline.
The smell may also result from a clogged air filter, a leaky fuel injector, or a defective mass airflow sensor.
2 Spark Plug Replacement FAQs
Let’s explore some more about spark plug replacement through these two commonly asked questions:
1. Why Do Old Spark Plugs Need Replacing?
Every time a sparkforms between the spark plug’s center and ground electrodes, it burns off small amounts of metal from each electrode. This gap increases as your vehicle‘sspark plugs constantly fire during engine operation.
With time, the spark plug gap grows so much that the requiredsparkno longer forms, and the spark plug fails.
2. Do I Need to Replace All the Spark Plugs?
Ideally, you should change all the spark plugs in one go. Changing spark plugs helps you prevent situations like an engine misfire, bad gas mileage, etc.
If you’re replacing only badspark plugs, each spark plug in your engine will have a different replacement cycle. Consequently, you’ll need to spend more effort and time with repairs whenever the spark plug on a specific cylinder fails.
Moreover, your engine works best when all the spark plugs have similar performance levels. For instance, if two spark plugs in your six-cylinderengineperform differently than the rest, it can cause the engine to go out of sync.