The F14D3 engine, which is installed on the Chevrolet Lacetti, was developed back in the early 2000s. True, “developed” is a loud word. In practice, this is an Opel engine developed in 1996 X14XE, almost all parts are interchangeable, the ratings and parameters of the crank group are identical, but no one really advertises this. Well, God bless him, we, the owners of the Lacetti, are more concerned about the cost of operation - what kind of gasoline to fill and whether it is possible to switch from AI 95 to AI 92.

The Lacetti engine is capable of digesting 92 gasoline, but it is better to pour 95.

Regular motor gasoline, so according to the international European classification called 92nd gasoline.

This means that it is used for medium loads atmospheric engines with medium compression. In Europe, both leaded grades and unleaded grades of 92 gasoline are produced. At the same time, 95th gasoline is classified as Premium motor gasoline . How big is the difference between these two brands? It is enough for General Motors to recommend AI-95 according to GOST 51105-97 (leaded gasoline) for use.

The numbers that indicate brands of gasoline are octane number. Therefore, the three units of difference play a significant role. And until 2009, GM recommended refueling with gasoline not lower than 92. Since that time, the engine has been slightly upgraded and fuel requirements have changed. New technologies for the production of petroleum products have also appeared.

So, AI-95, indeed, is obtained from gasolines of the lowest grade, but with the addition of modern additives (aromatic components, gas gasolines, products of high-temperature processing of distillate). And this is no longer the 95th one that was sold to us 10-15 years ago.

What gasoline to fill in a Chevrolet Lacetti

While the car is on warranty service, it is strictly forbidden to pour gasoline with an octane rating less than 95 into the tank.

And this is not a whim of GM and not a universal conspiracy. If during warranty period there will be a breakdown and as a result of the examination it will be established that detonation occurred in the engine due to the wrong brand of gasoline, the case will be considered non-warranty and the owner of the car will have to pay for repairs. The main reason for the firm's insistent recommendations is knock prevention.

knock sensor and 92 petrol

Many people think that the knock sensor, which is designed to signal the start of the detonation process to the control unit, the ECU will correct the ignition timing.

Yes, it will correct, but within certain limits. The thing is that the constant correction of the ignition timing already indicates that there have already been bursts of detonation in the engine, how quickly the sensor will react, how quickly the ECU will react and within what limits, one can only guess.

Meanwhile, the detonation continues. No one needs to explain how it's bad for the engine , but we saved a couple of rubles on the octane number of gasoline.

Survey

And what is the result: AI-92 or AI-95?

In Europe, by the way, there is no 92 gasoline, there is 91. And the difference between it and 95 is even greater.

It remains to draw a few important conclusions before choosing one of the pistols at the gas station - with 92nd and 95th gasoline:

conclusions

Naturally, everyone can draw conclusions for themselves. However, if we want our Lacetti to wave more than one hundred thousand kilometers, we should follow the manufacturer's recommendations. He doesn't give bad advice. Do not save on oils and gasoline and smooth roads to all!

How to convert the Lacetti to 92 gasoline or, conversely, to 95? Very simple. Here is a photo and video instruction of this simple procedure.

In the world of motorists, perhaps the most inexhaustible and controversial topic of debate is what kind of gasoline to use? 92nd or 95th?

Even in our community at the time of this writing, the votes were divided almost equally - 52% for the 95th and 48% for the 92nd.

Moreover, it is practically impossible to convince this or that half. I have expressed my opinion on this

But in fact, the reason for the disputes lies not only in beliefs and religious worship of this or that gasoline.

I would like to look at the other side of the coin. The fact is that very often you can hear from owners of seemingly identical cars completely different impressions of using fuel with different octane numbers. Someone writes that the car does not drive on the 92nd, someone hears detonation and other nuances. And someone, on the contrary, hates the 95th gasoline - like high flow, the car is dull, etc.

Why such opposite reviews from owners of identical cars? Of course, as usual, everything can be attributed to different fuel quality in different regions and at different gas stations. But let's leave it for those who have gasoline to blame for all their problems.

Let's try to figure it out according to Feng Shui

The fact is that despite the same engines, not all engine control units are configured the same.

Let's consider this in more detail.

On the first models for the Ukrainian market, special electronic jumpers were installed under the hood. On the diagrams, they received the name, which in translation means - octane switch.

I talked about this jumper in the article. By default, it was set to 91 octane from the factory.

But, after some time, this jumper was removed, and by default the ECU was set to octane 95. Therefore, even in the car's operating instructions, the Lachevods have different requirements for the fuel used. Someone is not lower than 91, and someone is not lower than 95.

These changes are associated with more stringent environmental requirements, which, apparently, did not allow the use of 91 octane.

From that moment on, the disputes over the fuel used escalated, as someone rode better on the 92nd, and someone on the 95th.

And some are convinced that there is no difference and all these settings do not give any effect, and the knock sensor will help adjust the ECU to any octane number.

What can I say ... Everyone has their own opinion and everyone has the right to think the way he wants.

But if you don’t think, but look at the real development of events, then you can see that when you switch the jumper to 95, the starting UOS actually grows on the diagnostic graphs. And you can also notice that the people made the knock sensor literally a holy and almighty sensor that can correct almost any situation. If you look at the diagnostic graphs, then the adjustment of the PTO by cylinders begins only at a speed of 90 km / h ...

How to translate Lacetti from 95 to 92

Despite the fact that the octane switching jumper was abolished, this option remained in the engine control unit. And it's not difficult to use it.

Consider this procedure on the SIRIUS D4 ECU, but these options are also available on other control units, including the HV-240.

To begin with, let's determine exactly what kind of gasoline your engine control unit is configured for, if you do not know this. To work, we need a 10 mm wrench and an ohmmeter (multimeter).

First of all, disconnect the negative terminal from the battery

... and remove the block from the ECU

We need the 27th contact of the ECU block. The extreme contacts are signed and it is not difficult to calculate the necessary contact. He is fourth from the right in the bottom row.

We connect the first probe of the multimeter to it. Not all probes reach the contact, so it is convenient to use a piece of wire

We connect the second probe of the multimeter to the "mass". The most convenient way to do this is by connecting to a disconnected contact from the battery.

We set the multimeter to the mode of measuring resistance or "continuity" and look at the readings. If the resistance is minimal, then the 27th contact of the ECU is connected to the "mass", and this, in turn, means that the ECU is set to the 95th octane.

In the photo below it is. 1.3 Ohm is the resistance of the probes themselves

Clear? I repeat.

If the 27th contact of the ECU block is shorted to ground, then the ECU understands this as the 95th octane. And if the 27th contact is not closed to ground, then the ECU understands this as the 91st octane.

This can be done in two ways:

• Remove pin 27 from the ECU block and leave it unconnected.
• Cut the wire from pin 27. You can leave it cut, or you can make a switch, or a “father-mother” for quick switching between 91st and 95th octane. Here the choice is yours.

To find the necessary wire, you need to remove the cap from the ECU block connector

Let's move it forward

We remove the cap and find our fourth wire from the edge from the 27th contact

Here is the wire

Attention! I have a car with an octane switch jumper under the hood, so my wire is blue! On cars without this jumper, the wire will be black with a white stripe! It doesn't change the point!

To switch to the 92nd gasoline, it is enough to cut this wire. And in order to switch back to the 95th, you need to reconnect this wire.

If you do not want to cut the wire, then you can simply remove the 27th contact from the ECU block.

To do this, we hook a yellow plastic chip from one end.

Then from another

And we extract it.

Before us are contacts in all their glory. Now you need to squeeze the contact we need with a needle and pull it out of the block

We collect everything back and our car can normally drive on 92-m gasoline.

It is also advisable to reset the adaptations using the Chevrolet Explorer program. You can download, configure and learn how to use in the section

Here is a video on how to convert a Chevrolet Lacetti to 92-gasoline

I’ll add on my own that I prefer driving on 95th gasoline in the Ron switch 95 position.

Well, what do you do and decide, in fact, you

Peace and smooth roads to all!

The entire range of engines Chevrolet Lacetti designed with an optimal ratio of efficiency and liter power. Fuel consumption is comparable to competitive models. At the same time, the car provides sufficient dynamism, allowing the car owner to feel confident both in city traffic and on the highway.

From poured gasoline into fuel tank stability depends on power plant and its durability. Therefore, the quality of fuel must be approached with the utmost responsibility and not pour fuel from dubious gas stations into the gas tank.

If gasoline consumption has increased and no external factors have changed, then this means that attention should be paid to the car. The consumption rate set by the automaker, although obtained under ideal conditions, is still a guideline for the normal operation of the power plant. A sharp increase in fuel consumption very often indicates that a unit or part of the power plant or related systems requires repair.

Fuel consumption with different engine sizes

The fuel consumption of the Chevrolet Lacetti depends on the volume of the power plant, as well as on the gearbox that the car is equipped with. Consumption per 100 km according to the Chevrolet Lacetti passport with 1.4, 1.6, 1.8 liter engines is shown in the table below.

Table - Fuel consumption Chevrolet Lacetti

Choice of gasoline

According to the manufacturer's recommendation, only unleaded gasoline with an octane rating of 95 or higher should be poured into the gas tank. Fuel with a lower octane will cause detonation in power unit and can cause damage to the cylinder-piston group.

Detonation damage occurs from the use of low-octane fuel in the power plant. They are easy enough to spot. In this case, the car owner risks losing free warranty repair. Therefore, if you want to reduce the cost of refueling, there should be no choice between 92 or 95. More details on the behavior of the car on various types of fuel are given in the table below.

Table - The influence of octane on driving chevrolet car Lacetti

Fuel tank volume

The volume of the tank is calculated in such a way that the car can cover up to a thousand kilometers without additional refueling. In more detail, the capacity of the gas tank of the Chevrolet Lacetti in various bodies shown in the table below.

Table - Chevrolet Lacetti gas tank capacity

Feedback from car owners suggests that the real capacity allows you to fill up to 65-67 liters before the cutoff. This is due both to the "honesty" of the gas station, and to the fact that the volume of the tank is slightly larger than normalized.

Description of the causes of high fuel consumption on the Chevrolet Lacetti and their solution

In the case of a worn motor, valve burnout, or ring sticking, compression may decrease in one or more cylinders. As a result, the fuel burns with less efficiency. This impairs vehicle dynamics and requires an increase in fuel consumption to maintain the desired speed limit. Elimination of the problem is possible only by defecting and replacing damaged components or parts.

Actual fuel consumption may differ from the norm due to insufficient tire pressure. The result is an increased force required to overcome the rolling resistance. To fix the problem, you need to pump up the wheels, controlling the pressure with a pressure gauge.

A common problem with the Chevrolet Lacetti is the wedging of the brakes. For diagnostics, it is required to check the temperature of the wheel disks after the trip. A jammed brake heats them up very much. For repair, it is necessary to replace the culprit of wedging, and then pump the brake system.

Fuel consumption may increase due to poor quality fuel. The engine has to burn more fuel to maintain the required dynamics. Very often, falsification becomes the reason why they are clogged fuel filter and mesh. The solution to the problem is possible by draining low-grade fuel and flushing the fuel line.

Influence of maintenance on fuel consumption

Untimely replacement of consumables or their poor quality is common cause why fuel consumption has increased. So, the fuel filter directly affects the air supply to form the air-fuel mixture. A drop in its throughput worsens specifications power plant and causes high fuel consumption.

Clogged air filter

spark plug, oil and oil filter also directly affect fuel consumption. They demand timely replacement and full adherence to the recommendations of the automaker.

Oil filter installation