I'm Kim Changbok, a loyal vehicle engineer Today, Santa Fe cm doesn't speed well and there's not enough power
I thought there was a lot of fumes coming out What's important is that the engine warning lamp didn't come in So I'll test drive and see what sensor data values I need to see
I'll let you know if I'm doing it What if you don't have enough power? In a diesel car First intake air flow sensor, second boost pressure. That's right
Whether the turbo works well or not Number three, fuel rail pressure If these three things are satisfactory to some extent, and if they're normal, we'll have to look at the other parts, but let's focus on these three things and look at the data values first Let's take a test drive with you I'm on the road. When I drive until I come to a place where I can drive, I'm slow in quickness and the car feels a little flinched It's not whistling, but it sounds like the wind is leaking So, as I said before Let's graph the air flow sensor, boost pressure, and fuel rail pressure I'll see if there's a breakdown
No fault code If we don't have a broken cord, many of our technicians get mental breakdowns So you have to look at the data values I moved on because my eyes are dark. Rail pressure The rail pressure is the actual rail pressure and the target rail pressure, so the actual rail pressure can follow the target rail pressure So I did this and the second one... What did I say
Mass air flow, mass air flow sensor, boost pressure sensor to check turbo status These three
I'll press the graph I'm going to press the accelerator pedal It's not that big of a difference since I'm idling But I think the boost pressure is going up a little late I'm going to drive Looking at the driving condition, it's going downhill, but it's slowly going out when I press the accelerator pedal I'm leaving and suddenly I'm leaving It's the same when you look at the graph I'll try it again on the uphill road Let's start the uphill path where the slope is about 15 to 20 degrees And I'll look at the scanner data values There's not much traffic. It's slowly going up And since it's high speed, I'm using my energy 80km/h Fuel rail pressure, intake air volume, boost pressure, they're all similar The boost pressure level is low, so I'll look at one that's good for you I'll step on 2 rpm Let's see how much the data value is It doesn't go well at low speed
After stepping on 2,000 rpm, it's only 1,100 rpm It shouldn't be like this It should be 1,400 to 1,500 kPa, but it's 1,200 now Since I fixed it at 2,000 rpm, it's about 1,180
It's about this much. The booster pressure drops considerably at low speed When I stepped on it, the booster pressure
The maximum value goes up by about 2,000 kPa Let's take a look at the intake air. The boost pressure is off Mass air flow sensor This is the intake air flow sensor
The intake air volume is about 27 to 31 kg/c I'll step on it again I'll step on 2,000 rpm
It's hard to guess Around 176.5 at 2,000 rpm The intake air volume is normal. The important thing is that the intake air volume is okay, but the boost pressure is quite different And look at the rail pressure. The fuel rail pressure
0:07:12.382,0:07:23.048
The fuel rail pressure should be compared to the target rail pressure and the actual rail pressure, so I'll just take out two Here, the target rail pressure and the actual rail pressure should be the same Actual rail pressure and target rail pressure are the same Then, I think there's nothing wrong with the fuel supply I'm going to go to the factory and check what's actually damaged, and I guess right now, the intake air is normal, but the boost pressure is low. That's what I'm saying Then, take the intake manifold or the turbo intercooler hose
Turbo intercooler I think there's going to be a problem with the intercooler or hose relationship, this hose relationship The amount of air goes in a lot because the turbo is sucking it, so we need to look at the intake manifold from the turbo to the intercooler Then I'll show you a simple experiment. Let's go I was going to go, but it's a red light
I'm going to go in a little bit The intake air flow sensor values are normal
The boost pressure sensor value is a little low, and it goes up, but it's low Then it means that the intake air leaks somewhere So, I prepared a 10mm vox
I'll simply check with these three types of pliers and box paper Let's start with the air cleaner I separated it I'm going to choke the engine I won't die
It's stuck, but the engine won't die Then it's definitely a turbo hose, an intercooler hose, and an intake manifold leak I removed this Let's find one I removed the hose from the turbo to the intercooler If you block this part here and the engine is off, you block the intercooler entrance, and if the engine is off, this hose is off If it doesn't turn off even if it's blocked, it'll be an intercooler or an intake manifold I'll block this part The engine won't turn off. It has to be rattled and turned off
Then if it doesn't turn off here, this hose is normal Let's move on to the second one I'll take this out I took this part out
If the engine turns off when you block this part, the intercooler is bad If it doesn't turn off, I'll have to look at the intake manifold I'll give it a try It's going to turn off. It's stuck
It's sticking and falling. I'll start the engine again I disconnected the throttle body and the hose from the intercooler I'll block the hose again. If the engine is turned off, the intercooler is turned off. If it's not turned off, it's the intake manifold. Okay? I'll block it It's going to turn off. What is it It means an intercooler went off somewhere. It went off I'll disassemble the intercooler, check the condition, and then repair it I opened the intercooler Let's observe This part is torn Usually, when the intercooler leaks, a small amount of blow-by gas comes out to the intercooler leak, and there is an engine oil stamp on the part where the engine oil vapor comes into contact Let's look at the engine cover You can see here, right? It's like the engine oil is sprayed There's dust on this part, and on this part, it's like sprinkled It looks like this. The click here disappeared I'm going to pour water here so that it's easy for you to see Because it's good for us to see, but we don't know if it'll come out well on camera So I'll pour water and observe this part Everyone, do you see it? There's a hole like that You can see it clearly. It's cracked right now. It's hard to tell with your eyes The reason I don't work during the day is because I can't see the sun, so I work at night. This is a joke I don't have that time, so I always film like this at night Look here. Here's the mouth So, please don't yell at me for taking it at night When you use a power tool like this Pull it slowly like an impact wrench
Slowly like this When you tighten a screw, if you speed it up from the beginning, the screw will get damaged I gave you one last shot I've put the intercooler together. So I'm going to test drive it and check how much the output has improved and how much boost pressure has improved I'll start. Even if I start earlier
I went out smoothly and stupidly without any quickness I'll try it now As expected, the output came back to life Look, the boost pressure is definitely alive When I just stepped on it
Let's do it again. But there's a car in front of us Hold on. It's a bit dangerous here I stepped on it for a second
The boost pressure was very low before, but now it's constant The acid is constant because I'm making the speed that's maintained The power of the engine has improved properly, and the boost pressure has increased as much as I want If it explodes that much, it's hard to make a leaky sound It's okay if I heard the sound of the wind leaking like this during the test drive, but it wasn't that loud even if I listened carefully. It was a bit subtle If there is a big difference between the boost pressure and the intake air volume, or if there is a difference between the fuel rail pressure, these three sensors can be used to check for cars with no output Please keep that in mind. You're having a hard time because of COVID-19 Let's cheer up! Korea, fighting!
