Jeep J-300 Spark Plug Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(193)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(193)

Spark Plug Replacement Service

How much does a Spark Plug Replacement cost?

On average, the cost for a Jeep J-300 Spark Plug Replacement is $125 with $30 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1964 Jeep J-300L6-3.8LService typeSpark Plug ReplacementEstimate$174.75Shop/Dealer Price$199.69 - $252.01
1963 Jeep J-300L6-3.8LService typeSpark Plug ReplacementEstimate$154.75Shop/Dealer Price$179.71 - $232.04
1965 Jeep J-300V8-5.3LService typeSpark Plug ReplacementEstimate$174.67Shop/Dealer Price$204.61 - $271.88
1965 Jeep J-300L6-3.8LService typeSpark Plug ReplacementEstimate$154.75Shop/Dealer Price$179.69 - $232.00
Show example Jeep J-300 Spark Plug Replacement prices

What are spark plugs and how do they work?

Spark plugs are one of the key components of your vehicle’s ignition system. They ignite gasoline and air inside of your engine. This gives your engine the power to propel you down the road. The spark plug takes high voltage electricity from the ignition coil and creates a spark at just right moment during the engine’s combustion cycle. This gives the engine the best mix of power, fuel economy and low emissions. However, the electrode at the end of the spark plug eventually wears out and can cause performance issues.

Spark plugs-MATROX-1

When should you replace spark plugs?

Replacement should follow the vehicle maintenance schedule. This will be listed in the vehicle’s owner’s manual. Some cars require regular replacement at 30k, 60k or 100k miles. It is possible in some cases that a spark plug might fail before the service schedule, but it’s not typically common.

Avoiding spark plug replacement can cause:

  • Difficulty starting your car.
  • Check engine light for a misfire code.
  • Flashing check engine light during acceleration for misfire, this can cause engine damage.
  • Reduced fuel economy and/or power.
  • Rough idle and/or unexplained engine vibration.
  • Failed State emission testing.

Even if only one spark plug is found to be faulty, they should always be replaced in sets. Most engines will require 4,6, or 8 spark plugs.

How do mechanics replace spark plugs?

Spark plugs are threaded into the engine’s cylinder head(s). Most cars have one plug per cylinder, so a four-cylinder engine will have four plugs, a six-cylinder engine will have six plugs, and so forth. The mechanic will:

  • Have the correct spark plugs on hand for your vehicle
  • Pull any diagnostic trouble codes that may be related to worn spark plugs.
  • Remove the original spark plugs and look at removed spark plugs for any clues indicating engine mis-operation exists; such as oil burning, excessively rich mixture, pre-ignition damage etc. Inform owner of any found unusual conditions.
  • Install new plugs using a torque wrench.
  • Finally, a road test of the vehicle to confirm normal operation.

Is it safe to drive with worn spark plugs?

Yes, but spark plugs that are worn enough to cause engine-misfiring have the potential to cause engine damage and overheating of the catalytic converter. Regardless of the age of the plugs, or mileage, if the engine misfires or runs poorly, the plugs should be inspected for defects. Generally, spark plug failure will not keep the engine from running, but in cases of extreme wear, you may experience a limitation in the speed at which you can drive the car. If the maintenance schedule says the plugs should be replaced, it is best to do so promptly.

When having spark plugs replaced keep in mind:

  • High-speed driving may accelerate spark plug wear. Consider earlier than required inspection and tune-up if you operate the car in severe conditions.
  • Plugs should always be promptly replaced per the manufacturer maintenance schedule even if they appear to be working perfectly.
  • If your vehicle is equipped with spark plug wires (as opposed to a coil-on-plug system), the wires should be replaced at the same time. This may increase the cost of your repair.
  • It is possible that when doing a spark plug replacement, your vehicle may also need additional parts like ignition coils, this will add to the repair cost.
  • Some engines require that the intake manifold be removed while replacing spark plugs. This may increase the parts and labor cost for the repair.
  • Leaking valve cover gaskets, which have let oil get in contact with the spark plugs, coils or wires, may be the cause of ignition system issues. Valve cover gaskets will need to be replaced in addition to the spark plugs, wires or coils. This will add to the repair cost.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Jeep mechanics

Real customer reviews from Jeep owners like you.

Excellent Rating

(193)

Rating Summary
186
5
0
0
2
186
5
0
0
2

Carlos

28 years of experience
501 reviews
Carlos
28 years of experience
Jeep Liberty V6-3.7L - Spark Plug Replacement - San Bernardino, California
Carlos showed up at EXACTLY our appointment time, finished the job promptly, and walked me through the different questions that I had. I had my spark plugs replaced and had the throttle body cleaned out. Ended up paying about $280. This was comparable to what I was quoted at different auto shops, but with the added convenience that I could stay home with my newborn baby. The ONLY downside is that when I called customer support to talk about my invoice, I was very obviously given some people in India with no energy and no problem solving skills. Seemed to just read off a script. but Carlos was awesome and helped me out greatly. I will be booking him for my next service if possible

Eliud

23 years of experience
200 reviews
Eliud
23 years of experience
Jeep Grand Cherokee L6-4.0L - Spark Plug Replacement - Jefferson, Georgia
Eliud was very knowledgeable and completed my repair quickly. Will definitely book him for repairs in the future.

Lucas

10 years of experience
33 reviews
Lucas
10 years of experience
Jeep Wrangler L6-4.0L - Spark Plugs - Frederick, Maryland
Great and knowledgeable mechanic. Very personable, would recommend

Peter

43 years of experience
1321 reviews
Peter
43 years of experience
Jeep Wrangler L4-2.4L - Spark Plugs - Gilbert, Arizona
Fantastic

Excellent Rating

(193)

Rating Summary
186
5
0
0
2
186
5
0
0
2
Number of Jeep Spark Plug Replacement services completed
2123+
services done by our mechanics
TOTAL NUMBER OF EXPERT Jeep MECHANICS
1300+
experts on our platform

Recent articles & questions

How Long Does a Differential / Gear Oil Last?
The The differential is normally located at the rear of your vehicle and underneath the car. It is essential that it stays lubricated with differential or gear oil for it to work properly and your vehicle to go smoothly down...
How to Put Flames on Your Car
Flames Flames on the side of a car are a throwback to the days of the hot rod, and many people enjoy decorating their cars with this iconic imagery. Painting flames on a vehicle is easy when you use the...
10 Best Stores to Buy Auto Parts in Portland, Oregon
Automotive technicians rely on auto parts stores to add and replace car parts. The best auto parts shop in Portland is AutoZone.

Car went backwards when I had it in drive.

This is a known issue in the Volkswagon Jetta transmission. Converter drain back is a situation where the automatic transmission fluid drains back into the transmission pan causing this kind of a reaction. Some of this is normal, but not...

Does my car have a timing belt or timing chain

Hello, thanks for writing in about your Honda Accord. Firstly, there is no way to know without looking your engine to check if it has a timing belt or chain. I have worked on a lot of Honda's and most...

2008 Mini, got an oil change 5w30 full synthetic, 2 days later oil fluid warning turned on. Few days later temp light came on. Car j

Hello. If everything was fine prior to changing the oil then that oil needs to be drained from the engine and another oil should be used. It is possible that you got a bad batch of oil depending on the...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com