Replace spark plugs yourself and clean throttle valves_vehicles, vehicles

Replace spark plugs yourself and clean throttle valves

September 17, 2024

Unwittingly, I have been with my Tuan for more than 6 years. I once cleaned the spark plug when the mileage was close to 30,000 km. Now that the mileage of Tuan has reached 60,000 km, it is time to replace the spark plug. How to judge that the spark plugs that need our car need to be replaced? I think it should be based on the actual state of the spark plug, mainly according to the service life of the spark plug, and the other is to judge according to the daily driving performance of the vehicle. Observe whether it is difficult for your car to start cold, whether the idle speed wobbles, whether the fuel consumption increases, or whether you feel a significant decline in engine performance, and whether there is an obvious sense of frustration. If there is one or more of these problems, there may be a problem with the spark plug, and it is necessary to check the state of the spark plug, remove it and check the color of the spark plug, the gap between the electrode, the gap between the porcelain and the metal, and so on, to further see if it is necessary to replace the spark plug.

If you want to do good work, you must sharpen its tools first.

Early preparation of spark plugs, in order to use the spark plug for a long time, in addition to the quality of the spark plug itself, but also need to have good car habits! Do not add inferior gasoline, drive with attention to detail, drive gently. The vehicle user manual recommends the replacement of spark plugs for 20,000 kilometers. in fact, I think that manufacturers can not accurately judge the use status of spark plugs in each car, and can only roughly give a reference range, so when the recommended service life is reached, you can check it and try to clean it to see if there is any problem. As long as there is no problem, continue to use it!

Unscrew the four screws on the hood with a screwdriver to remove the hood. Note that there is a hook on the left side of the hood that holds the coolant tube, which needs to be bypassed when taking it.

Take off the hood and show us that the four ignition coils are arranged irregularly and covered with a lot of dust. Cleaning is a must! There are three other pipes around the fourth one from the left.

The wires of the ignition coil harness plug are relatively short, so first open the fixed clip on the wire box for easy operation.

Counting from the left, the second ignition coil has a longer wire harness and is easy to operate, so pull out the ignition coil from it. Special ignition coil screwdriver, it’s time to come out.

When you pull it, you need to use some effort. When you hear a clear “bang”, the ignition coil is pulled out.

Plug the spark plug hole with toilet paper and clean the surrounding coil with a vacuum cleaner.

Be careful not to let dust and sundries fall into the combustion chamber, and then wipe the surrounding area with a dishcloth to ensure that it is clean, dry and free of oil.

Remove the clogged toilet paper ball. The pipe diameter of the vacuum cleaner is just large enough to insert the spark plug hole and absorb dust.

Everything is just right.

Loosen the spark plug with the 16mm sleeve.

The extension rod must be put on, press the sleeve against the spark plug and rotate the sleeve counterclockwise. The strength needs to be mastered well and done in one fell swoop, as long as it is loosened.

When the spark plug is completely loosened, the spark plug cannot be removed at the bottom. Then put the ignition coil in and press it down gently to suck out the old spark plug.

Judging from the color, the head of the old spark plug is brown and the color is normal. The electrode gap of the spark plug is also normal, but it is larger than 0.8mm, the head is not burned, and the whole is intact, so it seems to be in good condition, but after all, it has been used for 6 years, and it is almost old, so it is safe to replace it.

First use the sleeve to align the spark plug with the screw hole, gently screw it in by hand, screw to about 1/2 of the total thread length, and then fasten it with the sleeve. In the case of no torque wrench, screw it with an ordinary sleeve, as long as it feels tight, you don’t have to screw it hard, otherwise it is easy to break the screw. Of course, a torque wrench is recommended here.

Wipe the ignition coil, too. There is a lot of dust in the rubber mouth.

The ignition coil has a corresponding position and can’t be mistaken.

Press the ignition coil in and press down hard to ensure that the high voltage coil is tight.

Observe the height of the ignition coil to ensure compaction. It’s time to take the first spark plug.

Still pull out the ignition coil with a screwdriver

The process is no longer narrated.

When the third spark plug is taken, it interferes with the air pipe next to it, which hinders the pull-out of the ignition coil.

Unplug the air pipe to increase the space and make it easy to pull out the spark plug. If the space is large, the operation will be convenient.

Still clean the surrounding dust.

Tighten the spark plug, be sure to control the strength!

The air tube above the fourth spark plug completely blocks the ignition coil and must also be removed. Press and hold the buckle on both sides according to the arrow, release the lock, and release the air pipe.

The space is still not spacious enough. Anyway, the throttle needs to be cleaned, and the pressure pipe next to it is also removed.

Remove the wire from the wire holder on the pressure pipe.

Press the shrapnel on the wire harness, gently pull it out, and take it out.

Use a wrench to remove the two screws from the pressure pipe clamp, remove the clamp, and remove the pipe next to and below the pressure pipe from the pipe clamp.

The end of the pressure tube connected to the throttle is fixed by two clasps on both sides. Gently pull the two clips to the outside with your hands, and then pull the pressure tube up. It takes a little effort here, don’t worry. Pull the buckle to both sides must pay attention to grasp the strength, do not force too hard to break the card!

Take off the pressure tube.

Now the space is larger and it is easy to operate.

With the four replaced spark plugs, the gap between the electrodes was significantly enlarged, and there was carbon deposition on the head.

When the four spark plugs are replaced, check the height of the ignition coil, arrange the wire harness, and secure the fixing clip on the wire box. The spark plug is replaced, and the next step is to clean the throttle.

Remove these four screws and the throttle will be completely removed. You can see black carbon deposits around the throttle butterfly valve.

This is the card holder for fixing the throttle, and of course the upper part of it is responsible for fixing the buckle of the pressure pipe.

Of course, the wire of the wire holder should also be removed, press the shrapnel of the wire holder, gently pull it out, and then take it out.

Open the throttle butterfly valve, the edge of the valve is also black, there is also a black ridge on the valve body, which is very obvious, this is the carbon deposition that needs to be cleaned.

Clean with carburetor cleaner.

The inside and outside sides of the butterfly valve should be carefully cleaned to wash off a circle of carbon deposits on the valve body, including the edge of the butterfly valve.

The booth is directional, so you don’t have to worry about faking it.

How is it? Clean it up!

Make sure the green gasket is inside the groove.

It is important to install and fix the throttle valve properly.

When putting on the pressure pipe, first install the end of the metal port, and then align it with the end of the throttle holder. Align it and tap it down hard, and it will get stuck. Check whether the throttle holder end is installed in place, and finally reinstall the fixed pressure pipe clamp.

The rest is to restore everything to its original state, place the pipes into the pipe clips one by one, and connect the wire joints.

Everything was packed up and the power-on self-test test was started.

After the ignition, what happened? The EPC light is on, indicating that there is a fault in the electronic throttle system! What went wrong? Turn off the engine quickly and check the trouble!