Replacing spark plugs on a Mitsubishi Lancer X is a very simple task that will take a few minutes of free time. The manufacturer recommends replacing iridium spark plugs every 90,000 kilometers, at least that’s what is written in the Mitsubishi service manuals. In fact, the Rolf service center recommends changing them every 60,000 kilometers, most likely this is due to the poor quality of gasoline in Russia.
To replace spark plugs you must:
- An extended 16 socket or a 16 spark plug wrench with a lock; it is advisable that the outer diameter of the wrench be as small as possible, otherwise it will not fit into the spark plug wells.
- Torx E10 socket for 1.5 liter engine. For 1.8 and 2.0 engines, a regular 10mm hex socket is used.
- Spark plugs - 4 pcs.
Spark plugs for Mitsubishi Lancer X 1.5i:
- Mitsubishi MN176628
- Bosch 0 242 235 769- spark plug
Spark plugs for Mitsubishi Lancer X 1.8i and 2.0i:
- Mitsubishi MN163236- original spark plug
- Mitsubishi MN163807- original spark plug
- NGK FR6EI- spark plug
- Denso K20PSR-B8- spark plug
Please note that when purchasing original Mitsubishi spark plugs, the box will contain spark plugs from Bosch (for a 1.5-liter engine), and NGK or Denso (for 1.8 and 2.0-liter engines). The fact is that Mitsubishi in this case is only a packer, and the above companies are engaged in the production of candles. Knowing this, for the same amount you can buy two sets of candles instead of one.
Let's start replacing the spark plugs on the Mitsubishi Lancer X
1. First of all, you need to open the hood and remove the top plastic engine cover by pulling it up.
2. If there is a large amount of dust and debris on the engine, it is advisable to blow everything thoroughly. After this, you can begin to unscrew the ignition coil mounting bolts using a 10mm or Torx E10 socket, depending on the type of bolts. 
3. Now you need to disconnect the low-voltage input plug of the ignition coil, then pull the coil up and put it aside. 
4. Immediately below the coil there will be a spark plug, which must be unscrewed using a spark plug wrench with a magnetic or plastic lock. If you are using a regular extended socket, the spark plug can be pulled out using the fuel hose: 
5. Screw the new spark plug into place. If you have a torque wrench, it is advisable to tighten the spark plug to a torque of 25-30 Nm
6. Reinstall the parts in the reverse order of removal.
Replacing spark plugs on a Mitsubishi Lancer X is not at all difficult; you can do it in a few minutes. The main thing is to strictly follow the instructions and not deviate from them. If you have never done this before, then it is better to ask someone to help for the first time.
Service books from the official manufacturer indicate that it is best to replace spark plugs every 90,000 kilometers with iride spark plugs. In our country, this figure is less - 60,000 km, because the quality of gasoline in most of the region leaves much to be desired. If the spark plugs are ordinary, then it is better every 30,000 kilometers.
What will you need to replace?
16 mm wrench or special spark plug wrench. It will be good if the outer diameter of the hook is not large - then the tool will easily fit into the spark plug wells.
If you have a 1.5 liter engine, then you will also need a TORX E10 socket head, if 1.8 or 2, then just a 10 hex socket.
Set of new candles - 4 pieces.
Procedure:
1. Open the hood and remove the plastic engine cover. There is no need to unscrew anything - just pull the cover up.
2. If the engine is dirty, covered in dust or debris, then it is better to rinse and wipe everything thoroughly. Now you can safely unscrew the bolts that secure the ignition coils. To do this, you just need an E10 socket wrench or a simple 10 socket.
3. Now you will need to disconnect the wire plug from the ignition coil. Removing the coil is simple—pull the top and set it aside so as not to lose it or step on it.
4. Immediately below the coil we see what we are looking for. It is unscrewed with a special spark plug wrench or clamp. When using a simple socket, the spark plug can be removed using a fuel supply hose (as in the photo)
5. Install new spark plugs. It is better to first twist it by hand to feel whether the candle has hit the thread or not. If you feel that it is going “tight”, then it is better not to put any effort, but to unscrew it and try again. It's good if you have a special torque wrench: you will need to tighten it to a torque of 25 Nm
6. Reinstall everything in reverse order.
Now, which candles to choose? Different spark plugs are suitable for different power units.
For a 1.5 liter engine it is Mitsubishi MN176628 (original) or Bosch 0 242 235 769.
For 1.8 or 2.0 liter engines - original Mitsubishi MN163236, Mitsubishi MN163807 or NGK FR6EI,
Denso K20PSR-B8.
Remember that even if you buy an original product from Mitsubishi, the box still contains spark plugs from Bosch or NGK, Denso. There are no problems: Mitsubishi simply packages the candles, and partner companies handle production.
To replace spark plugs you will need tool:
- head for 10
- spark plug head 16
- crank / ratchet
- extension
When is it necessary to replace spark plugs?
The manufacturer recommends replacing spark plugs every 60,000 km. mileage, according to technical regulations. Iridium spark plugs must be replaced every 90,000 km. Because In Russia, the quality of gasoline leaves much to be desired; it is better not to delay replacing spark plugs.
Step-by-step guide to replacing spark plugs on Lancer 10
- Turn off the ignition and open the hood, take the ratchet and 10mm socket and unscrew the plastic cover on the engine, which is held in place by 3 bolts.
- We remove the protective cover and gain access to the ignition coils. We disconnect the chips from each of the coils; in order to remove it, you need to press the latch from above and pull it towards you.
- To prevent dirt from getting into the spark plug wells, we clean and blow off the dust around the ignition coils.
- Using a 10mm socket, unscrew one bolt on each of the 4 ignition coils. We remove the ignition coils and gain access to the spark plugs.
- I used a wrench with an extension to remove the spark plugs. An extension cord will be required since the candles are deep.
- We turn out the spark plugs and screw in new spark plugs.
- We put everything back together in reverse order.
Video instruction
