Ford F-350 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

(42)

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

(42)

Spark Plug Replacement Service

How much does a Spark Plug Replacement cost?

On average, the cost for a Ford F-350 Spark Plug Replacement is $124 with $29 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1975 Ford F-350L6-4.9LService typeSpark Plug ReplacementEstimate$187.47Shop/Dealer Price$215.59 - $277.45
1978 Ford F-350L6-4.9LService typeSpark Plug ReplacementEstimate$167.47Shop/Dealer Price$195.61 - $257.48
1981 Ford F-350V8-6.6LService typeSpark Plug ReplacementEstimate$269.07Shop/Dealer Price$322.61 - $460.68
1994 Ford F-350V8-7.3L Turbo DieselService typeSpark Plug ReplacementEstimate$566.31Shop/Dealer Price$665.25 - $892.37
1968 Ford F-350L6-4.9LService typeSpark Plug ReplacementEstimate$167.47Shop/Dealer Price$195.62 - $257.51
1994 Ford F-350L6-4.9LService typeSpark Plug ReplacementEstimate$153.67Shop/Dealer Price$178.36 - $229.88
1996 Ford F-350V8-5.8LService typeSpark Plug ReplacementEstimate$205.11Shop/Dealer Price$241.27 - $327.52
1975 Ford F-350V8-7.5LService typeSpark Plug ReplacementEstimate$221.27Shop/Dealer Price$261.84 - $360.50
Show example Ford F-350 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 Ford mechanics

Real customer reviews from Ford owners like you.

Excellent Rating

(42)

Rating Summary
39
1
0
0
2
39
1
0
0
2

Tim

15 years of experience
57 reviews
Tim
15 years of experience
Ford F-350 V8-7.5L - Power Steering Pump - Vancouver, Washington
Tim and his pardner are great

Kahlin

17 years of experience
41 reviews
Kahlin
17 years of experience
Ford F-350 V8-7.5L - Check Cooling System - San Diego, California
I was very pleased with how this repair was completed. I intend to have work done by Kahlin on my other vehicles based on how well this repair was made. Thank you very much.

John

27 years of experience
1019 reviews
John
27 years of experience
Ford F-350 V8-7.5L - Car is not starting - Santa Fe, Texas
Very efficient and friendly

Matthew

33 years of experience
1210 reviews
Matthew
33 years of experience
Ford F-350 V8-7.5L - Electric Problems - Yorktown, Virginia
Excellent job again! This mecganic is awesome!!!

Excellent Rating

(42)

Rating Summary
39
1
0
0
2
39
1
0
0
2
Number of Ford F-350 services completed
462+
services done by our mechanics
TOTAL NUMBER OF EXPERT Ford MECHANICS
1700+
experts on our platform

Recent articles & questions

How to Check Suspension Ball Joints
Ball joints are a suspension component that is found on virtually all vehicles. Ball joints are flexible joints...
The Guide to Right-of-Way Laws in Texas
At At times, one driver is going to have to yield to another, or to a pedestrian. This is both common sense, common courtesy, and law in the state of Texas. Right-of-way laws are in place for the protection of...
B1992 OBD-II Trouble Code: Driver Side, Side mount Air Bag Circuit Short to Vbatt
B1992 trouble code means means that the voltage from the side mount air bag circuit is higher or lower than the parameters set by the manufacturer.

Can a flywheel cause damage to a clutch plate?

This cannot be blamed on either party since the flywheel would show a spot that is low or high after it was machined. The flywheel may have what is called a "hot spot" from the last clutch slip which caused...

Car battery light is on

The battery light comes on to indicate that the charging voltage is low. It usually means there is a problem in the car's charging system. if the battery is in good condition, the car can still run for a...

I keep getting a cylinder 3 misfire code P0303. I have replaced the spark plugs and ignition coils and have had no luck.

Hello There, You may want to try checking things like mass air flow sensor, fuel pressure, injector connections/pulses, etc. Often times, when these components are not working properly or causing a lean fuel condition, this may cause a misfire due...

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