Mitsubishi Sigma Fuel Injector 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

(1,890)

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

(1,890)

Fuel Injector Replacement Estimate for Mitsubishi Sigma

Mitsubishi Sigma Fuel Injector Replacement costs $752 on average.

CarServiceEstimateShop/Dealer Price
1990 Mitsubishi SigmaV6-3.0LService typeFuel Injector ReplacementEstimate$1396.59Shop/Dealer Price$1729.36 - $2691.40
1989 Mitsubishi SigmaV6-3.0LService typeFuel Injector ReplacementEstimate$1370.59Shop/Dealer Price$1703.38 - $2665.44
Show example Mitsubishi Sigma Fuel Injector Replacement prices

Fuel Injector Replacement Service

What is a fuel injector and how does it work?

A fuel injector is a fuel metering device that sprays atomized droplets of fuel in a specific pattern into the engine’s intake manifold or directly into the combustion chamber. The injector has a solenoid and valve within and the operation, or pulsing, of the solenoid is controlled by the powertrain control module (PCM). The PCM controls the solenoid’s “on” time in order to keep the air-fuel ratio optimized while the engine load and operating conditions constantly change. Fuel injectors are usually connected to a fuel rail located on the top of the engine and the fuel rail, in turn, is supplied with fuel under pressure from the fuel pump located in the fuel tank.

When to consider replacing a fuel injector:

  • Rough idle, loss of power, or misfiring. Poor engine operation has many causes but faults in the fuel injection system, including the fuel injectors, are high on the list of possibilities.
  • Odor of raw gas or visible leaks. Fuel injectors should not leak fuel into the intake manifold when the car is off. If you notice any fuel odor around your car, the possibility of a leaking fuel injector should be considered. There should be no external leak from a fuel injector. If an externally-leaking injector is suspected, do not start your car due to the fire hazard.
  • Check engine light. Some fuel injection failures, for example, a faulty solenoid, may cause a trouble code to be set in the PCM and that will cause the check engine light to illuminate. The codes are read and the fuel injector is tested directly, as needed.
  • Major engine repairs, engine replacement, or lengthy storage. All fuel injectors will have deposits given enough mileage. These deposits can cause an imbalance in the performance of the injectors from cylinder to cylinder. When an engine is already disassembled, or if you are installing a new engine, that is a perfect time to service the injectors as a set. All injectors have tiny internal filter baskets. A professional injector service facility will clean each injector ultrasonically and replace these filters for a relatively low cost.

How do mechanics replace a fuel injector?

Injectors can be serviced once removed from the car or replaced outright with new injectors. If the injectors are serviced, specialized cleaning and test equipment are required. The choice to repair versus replace will depend on exactly what is wrong with the injector as well as customer preference. Either option requires removing the injector from the car and the following procedure is typical:

  • Once the engine is cold, the pressure within the fuel rail is relieved by briefly running the engine with the fuel pump fuse out.
  • The upper plenum on the intake manifold is removed along with any cables, hoses, or wiring that restricts access.
  • The supply and return lines are removed from the fuel rail. The electrical connectors to each fuel injector are unlocked and removed. The fuel rail is then unbolted and removed from the intake manifold.
  • The injector(s) requiring replacement are removed from the fuel rail, taking care to not allow any debris to enter the exposed openings. An O-ring seal usually holds the injector very firmly in a finely polished bore in the fuel rail.
  • Using a new O-ring, the serviced or replaced injector is re-inserted into the fuel rail — using engine oil on the O-ring to prevent damaging it. O-rings in this application fit very tight to prevent fuel leaks.
  • The fuel rail is re-installed and the supply and return lines are re-connected. The plenum is re-installed along with all cables, hoses, or wiring.
  • Finally, the engine is run, there is a careful check for leaks, and the vehicle is road tested.

Is it safe to drive with a fuel injector problem?

Yes, so long as there is no external leak of fuel from a broken or malfunctioning injector, it is safe to drive the car. However, if the injector is known to be malfunctioning, it can cause engine misfires, excessive emissions or, in the case of a badly leaking injector, can overload and overheat the catalytic converter. Additionally, fuel efficiency will always be diminished if the fuel injectors are not working properly.

When replacing a fuel injector keep in mind:

  • Using high quality (Tier One) gasoline may reduce deposits on fuel injectors and prolong their life.
  • If an injector problem develops that requires removal of one injector, the best practice is to remove and service all of the injectors at the same time. That service might involve replacement of the electrically failed injector along with off-the-car cleaning of the remaining injectors. Serving all injectors at once ensures the injector set will be balanced, in terms of flow rates, and in turn promote smooth operation of the engine.
  • Do not use fuel system cleaning compounds, or procedures, unless such materials are specified by the manufacturer of your car.
  • On the car cleaning of fuel injectors is not as effective as off-the-car cleaning because injectors have tiny internal filter baskets that should be replaced as part of the process of servicing a fuel injector.

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

(1,890)

Rating Summary
1,765
71
15
13
26
1,765
71
15
13
26

Matthew

33 years of experience
1164 reviews
Matthew
33 years of experience
Mitsubishi Raider V6-3.7L - Fuel Injector - Newport News, Virginia
Great Mechanic!!! Work was complete in a very timely manner. Much easier than having go through the gymnastics of having a dealership perform the work.

Jose

17 years of experience
154 reviews
Jose
17 years of experience
Mitsubishi Galant L4-2.4L - Oil Change - Henderson, Nevada
Jose was wonderful, very professional, very communicable with me and answered all my questions... He was very friendly & I loved his customer service demeanor... I have referred him to several people... I hope they call & schedule him for their services... I will definitely be requesting his services in the future!!! :-) :-) :-)

Eduardo

19 years of experience
520 reviews
Eduardo
19 years of experience
Mitsubishi Eclipse V6-3.8L - Check Engine Light is on - Houston, Texas
Showed up on time and ran diagnostics on my car. Eduardo was professional and provided the information we need.

Mario

15 years of experience
8 reviews
Mario
15 years of experience
Mitsubishi Eclipse L4-2.4L - Car is not starting - San Antonio, Texas
Did a great job

Excellent Rating

(1,890)

Rating Summary
1,765
71
15
13
26
1,765
71
15
13
26
Number of Mitsubishi services completed
20790+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mitsubishi MECHANICS
700+
experts on our platform

Recent articles & questions

The Best Used Cars to Buy If You’re a Realtor or Real Estate Agent
If If you make your living as a realtor or real estate agent, you may have a number of considerations when it comes to purchasing a used vehicle. The most common considerations are budget, ability to transport people, and comfort....
P0204 OBD-II Trouble Code: Injector Circuit Malfunction - Cylinder 4
P0204 code definition Injector Circuit Malfunction - Cylinder 4 What the P0204 code means The Engine Control Module (ECM) runs checks...
How to Get a New Jersey Driver's Permit
New New Jersey uses a graduated driver’s license program, like many other states. This program requires all new drivers under 18 years old to begin driving under supervision, in order to practice safe driving before getting their full driver’s license....

Need to know my van's towing capacity

Hi there. With the correct hitch and equipment being used on the vehicle, according to specifications, you can safely tow a maximum of 3600 pounds. If you add any more than this you will surpass what this van's towing capacity,...

Do you have to remove the transmission on a 2003 Chevy Tracker with a 4 cyl. engine to replace the crankshaft position sensor?

Hi there. The crankshaft sensor is mounted behind the engine flex plate flywheel. The transmission and the flex plate flywheel needs to be removed to replace the crankshaft sensor. If you need help with a crankshaft sensor replacement, a certified...

My manual car starts but will not move on any gears.

What you are describing sounds like potentially a worn out clutch. As you know, the clutch transmits engine power to the gearbox, and allows transmission to be interrupted while a gear is selected to move off from a stationary position,...

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