Mitsubishi Diamante 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

(33)

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

(33)

Spark Plug Replacement Estimate for Mitsubishi Diamante

Mitsubishi Diamante Spark Plug Replacement costs $422 on average.

CarServiceEstimateShop/Dealer Price
1994 Mitsubishi DiamanteV6-3.0LService typeSpark Plug ReplacementEstimate$753.20Shop/Dealer Price$916.31 - $1349.83
1996 Mitsubishi DiamanteV6-3.0LService typeSpark Plug ReplacementEstimate$393.62Shop/Dealer Price$476.87 - $670.73
1993 Mitsubishi DiamanteV6-3.0LService typeSpark Plug ReplacementEstimate$713.20Shop/Dealer Price$876.34 - $1309.88
1992 Mitsubishi DiamanteV6-3.0LService typeSpark Plug ReplacementEstimate$713.20Shop/Dealer Price$876.30 - $1309.80
2003 Mitsubishi DiamanteV6-3.5LService typeSpark Plug ReplacementEstimate$617.82Shop/Dealer Price$756.39 - $1113.35
2000 Mitsubishi DiamanteV6-3.5LService typeSpark Plug ReplacementEstimate$626.54Shop/Dealer Price$767.26 - $1130.73
1999 Mitsubishi DiamanteV6-3.5LService typeSpark Plug ReplacementEstimate$637.04Shop/Dealer Price$777.47 - $1140.73
1995 Mitsubishi DiamanteV6-3.0LService typeSpark Plug ReplacementEstimate$723.20Shop/Dealer Price$886.81 - $1320.71
Show example Mitsubishi Diamante Spark Plug Replacement prices

Spark Plug Replacement Service

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 Mitsubishi mechanics

Real customer reviews from Mitsubishi owners like you.

Excellent Rating

(33)

Rating Summary
29
3
0
0
1
29
3
0
0
1

Mathew

24 years of experience
93 reviews
Mathew
24 years of experience
Mitsubishi Diamante V6-3.5L - Transmission Position Sensor (Switch) - Jacksonville, Florida
He showed up right on time and took his time going thru service and other facets of my vehicle that weren't even being serviced. He went Above and Beyond by helping me with the hood of the car-the latch had broke and he jimmied it where it could open and close after it was in a fender bender-it had Nothing to do with why he was there, but he made sure it was road worthy...We definitely found Our Mechanic in Mathew!

Curtis

29 years of experience
163 reviews
Curtis
29 years of experience
Mitsubishi Diamante V6-3.5L - Car is not starting - Augusta, Georgia
He came did his job

Nicholas

11 years of experience
557 reviews
Nicholas
11 years of experience
Mitsubishi Diamante V6-3.5L - Tie Rod End Replacement (Front Left Outer, Front Right Outer) - Raleigh, North Carolina
Extremely friendly and did an awesome job

Keith

26 years of experience
231 reviews
Keith
26 years of experience
Mitsubishi Diamante V6-3.5L - Idle Control Valve - Fort Worth, Texas
Keith was on time and did the work in a timely manner. Hope the least expensive fix keeps her running for a few more months!!!

Excellent Rating

(33)

Rating Summary
29
3
0
0
1
29
3
0
0
1
Number of Mitsubishi Diamante services completed
363+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mitsubishi MECHANICS
700+
experts on our platform

Recent articles & questions

How Long Does a Fuel Injection Line Last?
Most Most car owners are unaware about just how complex their fuel system is. In order for a car to run and operate as intended, many different components will need to work together. The fuel injectors on your car deliver...
New York Parking Laws: Understanding the Basics
If If you are a licensed driver in the state of New York, you are likely well aware of the various laws regarding the roads. You know the speed limits and you know the proper way to pass vehicles on...
P0974 OBD-II Trouble Code: Shift Solenoid A Control Circuit High
P0974 means there is an abnormal voltage reading regarding the shift solenoid A control circuit, likely due to fluid issues or faulty wiring.

AC works sporadically

Hello. It sounds like you have an intermittent problem. If the A/C compressor or A/C pressure switch is working intermittently, this may cause the A/C to work intermittently as well. Have a certified technician, like one from YourMechanic, come and...

Rattling under hood,VDC and slip light both on 2010 Nissan Altima

Hi there - the Vehicle Dynamics Control (VDC) system uses the anti-skid brake system (ABS) and engine throttle control to enhance vehicle stability in extreme conditions - like cornering while it's raining. Most often, problems with this system are the...

My car has had trouble starting for the past 3 months. It cranks but it doesn't turn over in the morning.

There are a number of things that may cause this to happen, however based on what you are describing it sounds like you may have an issue related to maintaining the proper fuel pressure both while starting and sitting at...

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