Do-it-yourself throttle valve repair Lacetti

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17.06.2017
... ... We look at the operation of the Lacetti Throttle Valve directly on the running engine. He removed the protective cover and turned the throttle assembly 180 degrees relative to the mounting studs.
Everything became visible, and it became possible to film the operation of the Throttle Valve with the engine running. Start troubleshooting on page Lacetti twitches

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... ... I will write the article later, when I think everything over, I will review all the previous videos. The main problem is that everyone has the same control system, but the engine parameters are different, and the dampers for everyone on XX are open differently. I can fit the remote control to my car, everything will be perfect. But if you move my remote control to another car, then it will not work better. And I want to find a common option for all cars.

13.08.2017
... ... So far, by far, the best option that came to mind is to install a micro switch instead of a limit switch in the throttle assembly. Lacetti twitches 2... And reinforcement of the middle or lower engine mount Lacetti twitches 3... Maybe then something else will dawn on.
Wiring diagram of the Lacetti Throttle Unit:

Can be shared with friends

Hello now in this thread. After watching all the videos, the idea came to try to adjust (bend) the plates of the XX limit switch contacts in the remote control unit, i.e. so that limit switch XX in the remote control opens in the same way as an external attached limit switch opens. What do you think about this.

It will not work - the design itself will not work. You can try to make a hard contact, if a mass is applied to the DZ case, then a minus will appear on the axle lever. Solder or glue a metal plate on the IAC plastic lever at the point of contact of these levers. Solder this plate with a wire with a contact from which a negative signal is sent to the ECU. There the current is small, but they are pressed well. I think they will not burn in. Then these contacts will open not after, but during the opening of the remote control. But with a mikrushka, thanks to the gap in the structure, you can open the contacts before opening the remote control

Please tell me, before cleaning the remote control, the position of the remote control was 3.5% on a muffled and 5.6% on a started car!
After cleaning the remote control without even unscrewing it (I cleaned it very carefully) on a muffled car, the position became 3.1%, and on a wound one - 0%. On the forums, they tell me this should not be, it should be at least 3% (at XX). Resetting adaptations was done 3 times in a row successfully. in the parameters, the real position of the remote sensing and the Desired position of the remote sensing 23 steps.
Tell me is this the norm? Or is there something wrong?

In theory, 23 steps correspond to 2.3% of the opening of the remote control, but not zero. Will the throttle cable be tightened by accident? Has any hose burst after DZ?

The throttle valve of the Chevrolet Lacetti car is a structural part of the intake mechanism of gasoline-type power units with fuel injection. This part is designed to control the volume of air that enters the engine in order to form a fuel-air mixture. This spare part is located between the air filter and the intake manifold.

This component is an air valve. When the valve is opened, the pressure in the system is at atmospheric pressure. And when closed, it drops to a vacuum. This feature allows the use of the spare part in the functioning of the vacuum brake booster.

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The Chevrolet Lacetti car is quite common in Russia. Therefore, finding spare parts will not be difficult. This also applies to the throttle valve. The cost of the element varies depending on the type of drive.

1. The average cost of an element with a mechanical drive is from 1,500 rubles.
2. An electrically driven damper is sold in the region of 2,000 - 3,000 rubles.

According to the technical passport of the vehicle, the service life of the damper is up to 200 thousand kilometers. However, this is not the case in practice. In the absence of proper maintenance, the damper can fail ahead of time. The main maintenance requirement is the timely cleaning of the element.

You can determine the need to clean the throttle valve when the following symptoms occur:

• the occurrence of difficulties when starting the power unit;
• the motor does not start immediately;
• floating speed, as well as unstable operation of the power unit at idle;
• twitching of transport when driving at speeds up to 15 km / h;
• in the process of squeezing the clutch, the revolutions may fall too slowly or too quickly;
• occurrence of dips at 1000 rpm.

To clean the element, the first step is to remove it. The analysis of the spare part begins with removing the corrugation of the air duct and disconnecting the wires from the idle speed regulator and the part position sensor. The dismantling procedure does not require special efforts.

Note! When removing the throttle valve, it is important that the power unit is not hot. As there is a risk of burns.

After that, you should remove the hoses that are connected to the spare part, and then, and the cable from the drive. Thus, the way to the damper is open. It is enough to unscrew a couple of nuts and bolts and remove the position sensor and idle speed control.

Cleaning consists in flushing the element. For this, it is recommended to use a special agent that is intended for cleaning carburetors. The substance should be sprayed on all surfaces and channels. At the end of the process, wipe the part with a rag.

Special attention should be paid to the idle speed regulator. Large contamination may cause the needle to jam and not work properly. And before installing the elements, you should check the general condition of this element. If the needle has a large free play, then the part must be replaced.

Also, before installation, it is required to assess the condition of the gasket. If damage is present, the element should be replaced.

Note! After completing the installation of the throttle valve, adjust the cable tension.

After cleaning the element, the power unit may continue to malfunction. This feature indicates that the spare part needs to be repaired or replaced. The main cause of the malfunction is damage to the damper position sensor.

With this malfunction, the following symptoms appear:

• the power unit starts up with difficulty;
• high or floating idle speed;
• increased fuel consumption;
• during acceleration, power drops are observed.

In practice, repairing a damper is not a practical solution. Replacing the part will help to eliminate the breakdown.

The removal procedure is described above. However, if the owner is not confident in his abilities, then a reasonable solution is to contact a technical service. Qualified specialists will carry out the replacement quickly and at an affordable price.

Many Chevrolet Lacetti owners, after cleaning the damper, face a problem associated with stuck revs. The fault can only be rectified with adaptation. Official Chevrolet service centers carry out the procedure as follows:

• activate the ignition for 5 seconds;
• then turn off for 10 seconds;
• reactivate for 5 seconds;
• start the power unit in neutral;
• warm up the engine to 85 degrees without gas;
• if there is an air conditioner, then it should be activated for 10 seconds, and then turned off for the same period of time;
• for vehicles equipped with automatic transmission, use the parking brake. Press the pedals and move the gearshift lever to position D;
• then repeat the manipulation with the conditioner;
• turn off the ignition.

This sequence will allow the throttle adaptation to be reset, after which it will begin to function properly.

On the services themselves, experts carry out a reset using a specialized computer program.

well. sorted it out.

I guess this does not affect engine braking. The bottom line is that when I go downhill and take my foot off the gas pedal, for example, I feel as if the car is hitting a wall - the engine slows it down. But then suddenly for some fraction of a second this “wall” disappears and the car starts to move as if coasting in neutral. Another second and she again brakes with the engine.

It has already been written about a possible air leak. But this is very difficult to find. Is it worth looking for a smoke machine to find a fistula?
What else could it be? USR? Or is DZ itself behaving this way?

well. sorted it out.

The bottom line is that when I go downhill and take my foot off the gas pedal, for example, I feel as if the car is hitting a wall - the engine slows it down. But then suddenly for some fraction of a second this “wall” disappears and the car starts to move as if coasting in neutral. Another second and she again brakes with the engine.
Or is DZ itself behaving this way?

Those. If I understand correctly, is the firmware to blame?
Is this reliable information or guesswork?

Thanks! very useful link.
but there is little about the braking mode and there is no specifics ..

“The MAP sensor measures the vacuum in the intake manifold. ... Deceleration increases the vacuum. The change in vacuum is sensed by the MAP sensor and read by the ECM, which then reduces the injector run time due to the reduced fuel demand. ”

The ECM responds to changes in throttle position and air flow and reduces the amount of fuel. If deceleration is very fast, the ECM may turn off fuel for a short time. ”

Can turn off - it's like: to promise - does not mean to marry.

How is the log removed? Do you need a bookmaker for this?

Just before NG, problems began with turnover in the XX century.
I changed the candles, BB wires (the old ones were), looked at the errors through CE - no signs. Alarmed only by the position of the damper - 6.7.
I bought a haigirovski1 body trotl cleaner, removed the flap, cleaned it, reset the adaptations, the problem with xx was gone. But another appeared, and this was already found out the next morning. On a cold one it is very difficult to start, and the starter turns briskly, the pump hums, the engine starts, but instead of the intended 750 rpm, it barely works at 600, and it starts very reluctantly. I looked at the errors - p2119 got out (Functional error of the idle speed regulator), I threw it off. As soon as the car warms up a little, there are no problems with starting at all, not to mention when we start on a hot engine.
After flushing, the valve position is 5.5 in CE, it seems like a lot.
Yesterday I took it off again, washed it out, dropped the adaptations - everything is the same. There are no errors on hot, on cold - difficult start and error P2119. The position of the damper according to CE has not changed - 5.5. I checked the remote control connector - it sits tightly. I studied the primary sources - it is not yet clear how to proceed and where to look for the root of the problem

... Or is the bobby dead?
Throw in your thoughts

My Chevrolet Lacetti, how I got rid of the effect of floating engine speed.

Hello to all! I want to share my experience. The mileage of the Chevrolet Lacetti car - 1.6 liters of 2008 MKP 90,000 km, did the cleaning of the injector and the throttle valve in the workshop - “DZ” (the throttle valve drive unit - “PDZ” was removed), immediately after that the idling modes - “XX” and when driving in 1st and 2nd gear at low speeds, they became unstable, the car either accelerates or slows down, zadolbala.The engine revolutions spontaneously floated from 1000 to 3000, when shifting gears, the revolutions did not fall, but on the contrary rose to 3000, when they stopped, they returned to normal, but as soon as the car started coasting, they rose again, while the ride became twitchy, the check was either burning or not burning, diagnostics - there are no mistakes, I traveled all the stations, they take money, the result is zero.
I went to the dealers - 4 hours of work and 2.5 thousand rubles - the result is zero, no one says anything, what is the reason no one formulates - replace that, replace that, (1570 of them for installing original NGK candles, which the next day threw out - did not pass the test on the stand for candles). If you remove the connector from the speed sensor - the speed is normalized, changed the sensor - the same thing. I drowned out the USR - nothing has changed. I decided to tackle this issue, studied the diagrams and drawings, disassembled everything and in the end did everything myself.

When the gas pedal is released, the DZ takes the extreme counterclockwise position, and with the help of a metal lever in the DZ drive, closes the contacts of the XX mode switch. The electronic control unit - "ECU" receives a control signal of 0 volts - contact 55 of the ECU is shorted to ground. At this command, the ECU supplies voltage to the servo-motor of the throttle valve drive “PDZ”, the motor opens the throttle to the angle required for the engine to operate at the specified speed XX, depending on the performance of all engine sensors. The ECU determines the position of the DZ according to the voltage of the variable potentiometer DZ located in the lower tier of the PDZ (contacts 2,7,8 on the engine control sensor circuit), which is an ordinary pair of spring-loaded contacts fixed on the DZ axis and rotating along the resistor tracks on the PDZ board. The PDZ mechanism allows the servo-motor to rotate the remote sensor at small angles (approximately + _ 5 degrees) from the given position of the remote sensor.

How to quickly clean the throttle valve in a Chevrolet Lacetti with your own hands. This method will help you clean the throttle in 5 minutes without removing it. We carry out cleaning with a carbokliner, the original name is Carb Cleaner (means for cleaning carburetors). Perform all work with gloves; we use small pieces of a clean cloth for scrubbing.

Video of cleaning the throttle valve (throttle) in the Chevrolet Lacetti (Chevrolet Lacetti):

P.S. If, after cleaning the throttle valve, the revolutions remain elevated, with a mileage of more than 100 km, you will have to reset the adaptations through the special program Chevrolet Explorer (you can easily find it, the search engine will help you).

As you can see, the method is quite simple and primitive, but at the same time effective. If you want to thoroughly approach cleaning the throttle body, then you will need to remove it. repair Chevrolet Lacetti

Throttle body cleaning Lacetti

Cleaning the Lacetti throttle is a step-by-step photo instruction on how to clean the Chevrolet Lacetti throttle yourself.

I think everyone knows the fact that "thanks to" the crankcase ventilation system, oil vapors, after a certain time, heavily contaminate the throttle assembly. Because of this, the throttle valve does not begin to close tightly and may even stick, which entails malfunctioning of the engine.

If, during computer diagnostics, it is revealed that the throttle valve does not close by more than 5%, then this unit needs to be cleaned.

Also, the shutter must be cleaned in the presence of strong visual contamination. This will affect not only the smooth operation of the engine. but also on fuel consumption.

Nowadays, the choice of funds for this procedure is simply huge. Everyone will find something more suitable for their needs and financial capabilities.

For example, I use this tool.

Throttle valve cleaner

It costs 3-4 USD. Washes everything quickly and efficiently, it suits me.

The instructions say that you can even flush the fuel system by pouring it into a tank with gasoline. Also cleans the intake tract.

Throttle body cleaner

Many people clean the throttle assembly without removing it from the engine. This is not entirely correct, since dirt from the inside and especially on the damper axis remains! Therefore, it is better to remove the flap. Moreover, I do it in 10 minutes.

1. Remove the decorative engine cover

We loosen the two clamps on the corrugation

3. Using pliers, loosen the clamp and remove the crankcase ventilation hose from the valve

Remove the crankcase ventilation hose from the valve

4. Dismantle the corrugation together with the crankcase ventilation hose and this is what turns out

We dismantle the corrugation together with the hose

5. Pressing the latch from below, disconnect the wiring block from the Chevrolet Lacetti throttle assembly

Disconnect the wire block from the Chevrolet Lacetti throttle assembly

6. Turning the throttle drive pulley clockwise, remove the accelerator pedal cable through the groove

Removing the drive cable from the Lacetti throttle assembly

7. Now many people disconnect the coolant hoses to the throttle assembly, but I don't. First, it's faster this way. Secondly, you do not need to be smart with the hose plug so that the coolant does not flow. Thirdly, air will not get into the cooling system.

I simply remove the hoses from the holders and they are long enough to remove the throttle assembly.

8. We unscrew the three nuts and the bolt of the Chevrolet Lacetti throttle assembly and remove it from the studs

We unscrew the three nuts and the bolt of the Chevrolet Lacetti throttle assembly

As you can see, there is not a lot of pollution, but still there is

Dirty Lacetti throttle valve

9. Fit a rag under the throttle assembly so as not to smear the engine and wash off the dirt from the cylinder

Throttle body cleaning Lacetti

10. It is advisable to replace the gasket and clean the end of the intake manifold

Lacetti throttle assembly gasket

11. It is advisable to immediately flush the Lacetti crankcase ventilation valve. To do this, we unscrew it ...

Valve for ventilation of crankcase gases Lacetti

... and rinse it out so that the spring works without jamming

Flushing the crankcase ventilation valve Lacetti

We also wash the corrugation with a tube.

Chevrolet Lacetti Net Throttle

12. Putting everything together in the reverse order.

You can see in this short what and how happens when resetting adaptations with a throttle

Peace to your home and good luck along the way!

Good evening!
I have a question, do you need to look at the throttle value when the engine is running? Or with the ignition on?
I cleaned the DZ today, did not start the engine during diagnostics, it was 3.5%, after cleaning it became 2%, the engine did not start during cleaning and checking. I cleaned the DZ well on both sides, as in your description, on a running engine it shows 3.5-4.9. People write that after cleaning they have 2-3% at the start, I did not clean it well?))

Greetings, Dmitry! I don't know how you cleaned it, but I think it's good
First, you need to reset the adaptations. Secondly, you need to look at a running warm engine in idle mode.
Here is an example of my flap

There will be questions, ask. Good luck!

The Chevrolet Lacetti is considered a compact class “C” car, which was developed by the South Korean car manufacturer - GM Daewoo. It combines Italian design with advanced Chevrolet performance and excellent value for money. This is the second car model, which was built on a completely new platform - J200 and replaced DaewooNubira 2. In European countries, the car was produced from the very beginning as a brand - Daewoo, and since 2004 it began to be produced under the name - Chevrolet.

The interior of the Chevrolet Lacetti is decorated without any sophisticated features, but it still has a fairly modern look. The interior trim of the car is equipped with a large number of aluminum inserts.The presented car is one of the largest in the class, which means that passengers have a fairly spacious space. The trunk of any version of the Lacetti car has a fairly large volume and, moreover, it can always be easily increased due to the rear seat of the car.

Standard equipment of the Chevrolet Lacetti car:

• Power steering;
• Air conditioner;
• Frontal airbags for passengers and driver;
• Distribution of braking forces and automatic locking of brake mechanisms;
• Electric mirrors;
• Sound alarm;
• Rear lights - fog lights;
• Heated rear window;
• Tinted glass;
• Audio preparation;
• Decorative caps;
• Front suspension type - McPherson;
• Power windows are installed in front;
• Central locking with remote control;
• Electric headlight correction;
• Side moldings were made to match the body color;
• Full compliance with the requirements - Euro 2;
• The ability to adjust the height of the steering wheel and driver's seat;
• The rear seats have head restraints.

The Lacetti is produced in a four-door body - a sedan, a five-door body - a hatchback and a station wagon. The design of the station wagon model and the sedan was developed by the Italian studio - Pininfarina, and the design of the hatchback - by Giorgetto Giugiaro. A model equipped with a sedan body was introduced in 2002, a hatchback was released a year and a half later, and in 2004 the sale of a station wagon began. In the markets of some countries, under the name Lacetti, only a hatchback is distributed, and a station wagon and a sedan are called Nubira.

Chevrolet Lacetti sedan and hatchback

Chevrolet Lacetti with a sedan body:

It is considered one of the very first Korean models that were released for sale after the acquisition of the Daewoo model by the American company General Motors. At the moment, the Lacetti sedan is available in several trim levels, such as the SX and SE. Their main difference lies in the installed gasoline engine. In the SX configuration, the car has a 1.6 - liter engine, while the SE is considered more powerful and has a 1.8 - liter engine. In addition, the version with a larger setting of the power performance of the car includes leather steering wheel upholstery, an armrest is installed in front, and the driver's seat also has a lumbar support.

Chevrolet Lacetti with a hatchback body:

Among European countries, the hatchback model is in greater demand than the sedan model. To date, from the entire list of engines made for the hatchback, only a 1.6-liter gasoline engine is used, which develops power up to 109 horsepower. The mechanical transmission has five gears.

Chevrolet Lacetti station wagon:

It is considered one of the most popular station wagons. Here, the buyer is not provided with an alternative gasoline engine to an already installed engine with a volume of 1.8 liters. The station wagon engine can develop up to 122 horsepower. The manual transmission has only five gears.

In addition to choosing the right car model, every motorist should be able to take care of it. Among motorists, the following question is quite common: What is a throttle valve and how to care for it?