DIY nissan sunny qg15 engine repair

The topic of Japanese cars and the quality of their workmanship is almost limitless. Today, models from Japan can compete with world-famous German cars.

Of course, more than one industry can do without drawbacks, but buying, for example, a model from Nissan, you don't have to worry about reliability and durability at all - these qualities are always high.

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A fairly popular power unit for some Nissan models is the well-known QG15DE engine, to which there is a lot of space on the network. The motor belongs to a whole series of motors, from QG13DE to QG18DEN.

Nissan QG15DE cannot be called a separate element of the engine series, for its creation was used the base of the more practical QG16DE, which was distinguished by increased consumption. The designers reduced the bore by 2.4 mm and installed a different piston system.

These design improvements have resulted in an increase in compression ratio to 9.9, as well as more economical fuel consumption. At the same time, the power increased, although not so noticeably - 109 hp. at 6000 rpm.

The engine was operated for a short period of time - only 6 years, in the period from 2000 to 2006, while constantly being refined and improved. For example, 2 years after the release of the first unit, the QG15DE engine received a variable valve timing system, and the mechanical throttle valve was also replaced with an electronic one. On the first models, the EGR system was installed, but in 2002 it was removed.

Like other Nissan engines, the QG15DE has an important design flaw - it lacks hydraulic lifters, which means that over time, valve adjustment will be required. Also, a timing chain is installed on these motors with a fairly long operating life, which ranges from 130,000 to 150,000 km.

As mentioned earlier, the QG15DE unit was produced for only 6 years. After that, his place was taken by HR15DE, with more improved technical characteristics and performance indicators.

To understand the capabilities of the engine, you should familiarize yourself with its characteristics in more detail. But it is necessary to clarify right away that this motor was not created in order to register new speed capabilities, the QG15DE engine is ideal for a calm and constant drive.

When choosing a car with a QG15DE engine, you should pay attention to the economical fuel consumption - 8.6 liters per 100 km when driving around the city. A good enough indicator for a working volume of 1498 cm3.

To determine the engine number, for example, when re-registering a car, just look at the right side of the engine block. There is a special area with an embossed number. Very often, the engine number is covered with a special varnish, otherwise a layer of rust may very soon form.

What is the expression of such a concept as the reliability of the power unit? Everything is very simple, it means whether the driver will be able to reach the destination with any sudden breakdown. Not to be confused with service life.

The QG15DE motor is quite reliable due to the following factors:

• Fuel injection system. The carburetor, due to the lack of electronic components, allows you to win in acceleration and jerk from standstill, but even the usual clogging of the jets will lead to a stalled engine.
• Cast iron cylinder block and cylinder head cover. A material with a sufficiently long service life, but does not like sudden temperature changes. Engines with a cast iron block should only be filled with high-quality coolant, preferably antifreeze.
• High compression ratio with small cylinder displacement. As a conclusion - a longer service life of the engine without loss of power.

The engine resource was not indicated by the manufacturer, but from the reviews of motorists on the Internet, we can conclude that it is at least 250,000 km. With timely maintenance and non-aggressive driving, it can be extended up to 300,000 km, after which a major overhaul must be carried out.

The QG15DE power unit is absolutely not suitable as a basis for tuning. This motor has an average performance and is designed only for a calm and even ride.

There are the most frequent breakdowns in the QG15DE engine, but with quality and timely maintenance, they can be minimized or avoided.

It is very rare to find a broken timing chain, but a more frequent occurrence is its stretching. Wherein:

• Engine starts poorly or won't start at all. In this case, it is necessary for the starter to perform long-term work, which also affects its operational life.
• The appearance of floating idle speed.
• Possible failures in work, very similar to the consequences of a failed spark plug.
• Increased noise level during engine operation.

There is only one way out of the situation - to replace the timing chain. Now there are many high-quality analogues, the price of which is quite affordable, so there is no need to purchase an original, the resource of which is at least 150,000 km.

The problem is very common, and if the timing chain has nothing to do with it, then you should pay attention to such an element as the throttle valve. The engines, the production of which began in 2002 (Nissan Sunny), were equipped with electronic shutters, the cover of which requires periodic cleaning.

The second reason may be a clogged grid of the gasoline pump. If cleaning it did not help, then most likely the fuel pump itself is out of order. To replace it, the help of service station specialists is not always required, such a procedure is done by hand.

And as the last option - a failed ignition coil.

Most often occurs when operating at reduced speeds. The reason for this whistling is the alternator belt. You can check its integrity directly on the engine; a visual inspection is enough. If there are microcracks or abrasions, the alternator belt together with the rollers should be replaced.

The indicator of a worn-out alternator belt can be a battery discharge lamp. In this case, the belt simply slips around the pulley and the generator does not make the required number of revolutions. When carrying out repairs, you should also check the crankshaft sensor.

They are especially sensitive when starting a ride and when engaging first gear; the car also jerks when accelerating. The problem is not critical, it will quite allow you to get to the house or to the nearest service station, but the solution will require the involvement of an injector setup wizard. Most likely, you need to rewrite the ECU system or see how the main adjusting sensors work. This problem occurs both on models with mechanics and automatic transmissions.

The consequence of a failed catalyst is black smoke from the exhaust pipe (these are not worn oil seals or rings, as well as a malfunction of the lambda probe), and an increase in the CO level. After the appearance of thick black smoke, the catalyst should be replaced immediately.