Replacing Corolla spark plugs: which ones to buy, gap, how to change

Spark plugs are an engine element, the proper operation of which affects the operation of the engine, and therefore the vehicle. The uninterrupted operation of these units ensures that there are no gaps in the starting system and, as a result, proper power, as well as normal fuel consumption.

Replacing spark plugs on a Toyota Corolla is a periodically necessary procedure. The car owner independently decides which parts to use - original parts or budget analogues. As a rule, updating the ignition elements on your own is not difficult, Corolla is no exception in this regard.

Frequency of replacing spark plugs on Corolla 150

The manufacturer has set a period for regular updating of Toyota Corolla spark plugs - every 100 thousand kilometers.

Symptoms that indicate the need for another replacement:

increased fuel consumption;
problems starting the engine;
the appearance of shaking at idle;
problems with acceleration of Toyota Corolla.

The inclusion of a special "Check Engine" indicator also indicates problems with the Corolla elements in question.

Corolla 180 under the hood

Factors affecting wear and the need to update ignition elements in a Toyota Corolla:

The use of low-quality fuel, which is an enemy to the components and assemblies of the vehicle. Normal operation can be ensured by AI-95 gasoline and higher.
Excessive aggressive driving also negatively affects the wear and tear of automotive components. Active driving negatively affects the units, including the engine starting system. At higher speeds, the ignition elements generate a spark many times more often and are more subject to wear.
The use of cheap analogues rather than original parts, according to the rule “the stingy pays twice,” leads to frequent replacement, nullifying the car owner’s attempts to save money.

Why is it necessary to change spark plugs on time?

You need to proceed from the interval set by the manufacturer. As soon as the owner of a Toyota Camry begins to have doubts that the mixture is ignited properly, this is already a sign that it is time to replace the old set of spark plugs with a new one. If this is not done on time, numerous problems may arise. For example:

the engine power will decrease, and the engine itself will begin to work incorrectly;
more fuel will be consumed than intended from the very beginning;
the catalyst will clog and last less than it is capable of;
the power plant will be difficult to start, especially in winter weather;
the car will lose its dynamism, so you won’t even have to dream about any sporty or just fast driving.

Timely and correctly replaced Toyota Camry spark plugs with a volume of 2.5 or 3.5 is a procedure that helps prevent the problems mentioned, prolong the operation of components and save resources required for repairs without loss.

Do-it-yourself replacement of spark plugs on a Toyota Corolla

Replacing spark plugs for a 2008 Toyota Corolla , as well as other years of production, is quite simple and accessible. A car enthusiast can carry out this procedure on his own. Manipulations with the ignition elements of the engine do not require preparation, expensive tools and equipment; installation of spare parts is extremely simple and does not take much time. For reliable operation of the motor, original parts or proven analogues are used.

Original spare parts

The market offers not only original Toyota Corolla spark plugs , but also budget counterfeits that are of poorer quality. It is easy to distinguish an original spare part from a low-quality analogue: the original white insulator is not covered with bubbles, the inscription on it cannot be erased with a fingernail. In addition, there are no chips, burrs or defects on the original spare parts. Also, the ring should not unscrew, and the circular engraving should be applied evenly. Non-compliance with the mentioned rules indicates that this is not an original, but a low-quality fake.

On the original spark plug, the sealing washer is tightly seated. The fake one moves freely.

To determine the originality of a spare part, use a multimeter. The sensitivity adjusted for these purposes is 20 kOhm. The detectable resistance in counterfeit ignition parts will be zero, while the original parts will show 5 kOhm.

Popular analogues

Denso is the official supplier of Toyota.
There are popular affordable analogues of spark plugs for the 2008 Toyota Corolla , such as Denso K16R-U11, which is an analogue of Bosch 8 in terms of the glow rating of the spark plug, NGK BKR5EYA. They are widespread and are not inferior in quality to the original ones. Analogs, unlike budget counterfeits, provide comfortable and reliable engine starting, and their service life is close to the service life of the original parts.

Replacement procedure

First you need to remove the plastic motor cover, for which you use a 10mm wrench. Under the cover there are 4 chips installed on the coils that need to be removed. The coils themselves are secured with bolts, to remove which you will need a spark plug wrench for the Corolla 150 body 14.

Using the mentioned spark plug wrench, it is necessary to unscrew the spark plugs counterclockwise from the holes in which the removed coils were located. In order to carefully remove the spare part, it is recommended to first magnetize the key or use long tweezers. Having dismantled the old parts, you need to install new ones in their place and reassemble in the reverse order.

Heat resistance of spark plug

Most spark plug manufacturers use Arabic numerals to identify the insulator. These numbers indicate the thermal number i.e. heat resistance of the candle.

The heat resistance of a spark plug is determined by the ability to release heat to the engine head that is received at the working part of the spark plug under the influence of combustion products.

Typically, heat resistance is adjusted by changing the length of the thermal cone of the insulator. Plugs with a long insulator are called hot. With a short insulator cold.

Hot candles have a larger heating area due to the long insulator. The heat run track is also long. Therefore, the temperature of the thermal body of the insulator increases.

Cold candles have a small heating area. And the temperature of the thermal insulator body decreases due to the short heat path.

For example: On Denso spark plugs the thermal number is indicated from 9~37. Smaller numbers indicate hot candles, and larger numbers indicate cold ones.

For passenger cars, the numbers are usually 16 or 20, and for racing cars, 27 and above.

For example: On NGK spark plugs, the heat number ranges from 2 to 11. Smaller numbers indicate hot plugs, and larger numbers indicate cold ones.

If you screw a spark plug with a different heat rating into the engine, then two of the most common malfunctions can occur: the spark plug will either overheat, which threatens hot ignition, or it will be “filled with soot,” that is, it will not be able to clean itself.

By the way, about self-cleaning: you can check whether the spark plug for the engine is correctly selected in this way - start the engine and let it run at idle speed for several minutes. Turn off the engine and unscrew the spark plug.

If its insulator, which was previously white, has become with a grayish or blackish tint, this is already good. After that, tighten the spark plug again, start the engine and “drive” it at speeds of about 3,000 for 3-4 minutes. Turn it off again and unscrew it again.

If the grayish-black coating has disappeared from the spark plug insulator, the spark plug is “correct”, its heat number is “correct” because the self-cleaning process is maintained. If this does not happen, you should think about it and look for the reasons.

Japanese cars for the “mass” consumer mainly use “standard” spark plugs with a “standard” heat rating - 5/6 for NGK or 16/20 for Denso.

Corolla ignition element clearance

Despite the fact that most car owners have heard about the ignition element gap, few have any idea how to take this parameter into account in practice. It is difficult to underestimate it, since it is important not only for the correct selection of spare parts, but also for the direct installation process.

Spark plug gap

The gap is the distance between the spark plug electrodes, the correct setting of which determines the engine ignition process and Toyota fuel consumption. To set the gap of the ignition elements, you will need adjusting probes and a special key; adjustment is made on the removed spare part.

For a 2008 Toyota Corolla, the correctly set engine spark plug gap is 0.8 - 0.9 mm.

Installing spark plugs

1. First install the spark plug and lightly screw it in until it stops.

2. Then tighten the spark plug with a special spark plug wrench to the torque indicated in the table.

Recommended (correct) tightening torque

Although spark plugs are relatively easy to remove and install, mishandling them can cause spark plug or engine damage.

If the spark plug is loosely screwed on, the contact between the spark plug and the cylinder head is impaired, sufficient thermal conductivity is not achieved, and in the worst case the spark plug may melt.

If the spark plug is screwed on tightly, the screw part may break.

Consequences of over-tightening spark plugs

When the sealing ring has nowhere else to compress, the spark plug body deforms, it stretches out, but the hexagon remains in place.

When tightened, the threaded part goes deeper into the cylinder head. The insulator begins to rotate freely in the housing, and the seal of the spark plug is broken.

Heat removal from the central electrode deteriorates; in this state, the spark plug is not cleaned and stops working.

As you continue to tighten the spark plug, it is destroyed - the threaded part is separated from the body.

Recommendations

Comments 27

Yes, there are a lot of fakes... That's why I opened an individual entrepreneur and sell spare parts, oils, lamps and tires)))) I maintain direct contact with the Denso representative in our Southern Federal District. Now, if I run into a fake, then what can we say about those who buy spare parts through websites (existence, emex, autodoc...))))

hi, but the markings on the candles are different,

Yes, she has changed. If you go to the Denso website, enter the car data, you will be given new part numbers. Choose iridium ones.

it’s clear, they gave me a Denso in the store, they checked the VIN, although from Merced, Mitsubishi and Nissan, they work fine, but not mine), I read your entry, went into the existential, so the price of a candle is 1000, before the replacement they were Bosch, now they are 440 R., I found it on an existential shop with the markings you took off, for 2000 rubles. package

Yes, she has changed. If you go to the Denso website, enter the car data, you will be given new part numbers. Choose iridium ones.

I’m also interested in the difference in prices, the ones you had cost 1052 and the ones you priced 654, I wonder why

Article number and cost of the original ignition coil for Corolla 150 and its analogues

The branded ignition coil has catalog number 9091902266. The cost of a new product ranges from 3,000 to 5,000 rubles. There is also the opportunity to purchase the product from auto dismantling yards. Since the residual life of a used coil is unknown, experienced owners recommend purchasing analogues from third-party manufacturers. A list of the best options is given in the table below.

Table - Ignition coils for Corolla 150 from third-party manufacturers

Company manufacturer	Article number	Cost, ruble
Mobiletron	CT37	2000-2500
Bremi	20485	1600-2000
ERA	880245	1800-2200
Magneti Marelli	060717119012	1400-1800
Janmor	JM5144	1300-1550
Delphi	GN1031312B1	2000-2400

Necessary tools and materials for repair work

To carry out repair work you will need:

10 mm wrench or socket;
spark plug wrench or 14 mm socket with extension tip and torque handle;
rags for wiping;
special gripper or magnetic tip for removing parts from wells.

Spark plugs and coils for Toyota Corolla e180

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FAQ/
Spark plugs and coils

Spark plugs on the Korolev are changed according to regulations once every 100,000 km. All maintenance regulations. Such a long service life is due to spark plugs with a long service life, thanks to the Iridium electrode.

Replacing once every hundred thousand is a very large resource that allows us to save a little, but as practice has shown, one hundred thousand is their maximum period, so it is advisable to change it closer to 70,000 km.

You can change the spark plugs on our Corolla yourself; almost every car enthusiast can do it. You will need a 14mm spark plug wrench, a screwdriver to unscrew the coil mounting bolt and a cloth to wipe dust from the spark plug wells so that when removing them, dirt does not get into the cylinders.

As a rule, the original spark plugs are from DENSO . If you buy them not with the Toyota logo, but with the Denso logo, you can save a lot. Let's understand the part numbers!