The situation of a Niva Chevrolet injector tripping the engine is familiar to many owners of this SUV. The car starts to twitch, the traction disappears, and fuel consumption increases markedly, which is especially unpleasant when frequent outdoor trips or off-road conditions, which means that one or more cylinders of the engine are operating inefficiently or completely disconnected, disrupting the balance of the power unit.
The reasons for this behavior can be many: from banally worn candles to serious problems with compression or electronics. Injection system fuel supply installed on Chevrolet NivaIt is sensitive to gasoline quality and sensor condition, and ignoring the problem can cause the catalyst to fail quickly and cause costly exhaust repairs.
In this article, we will discuss in detail the main causes of trimming, methods of self-diagnosis and ways to troubleshoot. You do not need to be a professional mechanic to understand the essence of the problem, but accuracy and care when checking nodes are required.
Main signs of engine failure
You can tell if the engine is not working properly, by the characteristic signs that appear immediately after starting or during the movement. idle: the tachometer hand is floating and the body vibrates vibrating, the first signal that the mixture in the cylinders is not evenly burning.
When you press the gas pedal, the car can react with a delay, there are dips and jerks. The engine loses power, and acceleration becomes sluggish, especially when you climb uphill or try to overtake. In some cases, black smoke begins to come from the exhaust pipe, and the smell of unburned gasoline becomes clearly audible.
- 🚗 Strong vibration of the body and steering wheel at idle speeds.
- 📉 A noticeable drop in power and acceleration dynamics.
- ⛽ A sharp increase in fuel consumption.
- 🔊 Cottons in a muffler or intake manifold.
Special attention should be paid to the sound of the engine running, and if instead of a smooth hum, you hear an intermittent "clouding", then one of the cylinders is not working. The absence of ignition in one cylinder leads to the entry of unburned fuel into the exhaust manifold, where it can burn out, causing overheating and destruction of the catalyst.
Problems with the ignition system: candles and wires
The most common reason why Niva's Chevrolet engine is troubling is a fault in the ignition system. spark-plugPlacing on electrodes, an increased gap or a broken insulator can completely disrupt spark formation. Visual examination often helps to identify a "dead" candle, but it is best to check them on a special stand or by replacement method.
The second important element is high-voltage wires, and over time, the insulation of the wires dries up and cracks, especially in the conditions of temperature changes under the hood. Chevrolet NivaThe microcracks leak the current, and the spark just doesn't reach the candle, and you can check the wires at night, because if you see "dancing lights" under the hood, you're seeing a breakdown.
☑️ Diagnostics of the ignition system
It is also worth paying attention to ignitionThis device often fails because of overheating or internal malfunction of the coil, and if the replacement of the candles and wires did not help, it is likely that the module is the problem, and its replacement is not a complicated procedure, but requires accurate diagnosis so as not to change the serviceable part.
⚠️ Warning: When checking high-voltage wires on a running engine, use dielectric gloves or tools with insulated handles to avoid being electrocuted.
Remember that even a new candle can be defective. So, when buying a kit, give preference to the proven brands recommended by the car manufacturer. Incorrectly selected kalyl number can also cause unstable engine performance.
Failures of the fuel system and injectors
If the spark is all right, the next suspect is the fuel supply system. Nozzles. They can get clogged with resins and deposits in poor-quality gasoline over time, and a clogged nozzle doesn't spray fuel, it pours it in a jet or doesn't deliver it at all, leading to over-enrichment or depletion of the mixture in the cylinder.
For the diagnosis of nozzles on Chevrolet Niva They often use the method of comparing the engine when each nozzle is turned off in turn, and if the nature of the engine does not change when a certain nozzle is turned off, then this cylinder has not worked or is not working well. fuel-filter and the pressure in the ramp.
The low fuel pressure generated by the gas pump can also cause tripping, especially under load. If the pump is worn out or the fuel receiver grid in the tank is clogged, the engine will starve. This often manifests as a loss of traction when you press the gas sharply.
How to clean the nozzles without removing?
There are special fuel additives that help to clean the nozzles from mild contamination, but when strongly coked, only ultrasonic cleaning on the service or washing with a solvent with the connection of special equipment is effective.
Air suction and sensor problems
Intake leakage is a common reason why the engine is troubling, and the air is getting into the cylinders after the engine is gone. air mass flow sensor (MADR)The electronic control unit (ECU) cannot correct the composition of the mixture, and the engine begins to operate unstablely.
Most often, air suction occurs through:
- 🌬️ The intake manifold (dubies with time).
- 🌬️ Receiver O-rings.
- 🌬️ Cracks in the pipes of the crankcase ventilation system.
- 🌬️ Idle control (RX)
To find a pump, you can use the method of spraying a flammable liquid (for example, a carburetor cleaner) into suspicious areas with the engine running. If the speed changes, then there is leakiness in this place, and it is worth checking the throttle position sensor (TRP) and the DMRV itself.
Faulty. DMRV It can transmit incorrect data about the amount of incoming air, which knocks down the mix settings, and you can check it by temporarily turning off the connector: if the engine performance improves or becomes more stable (albeit with increased flow), the sensor is likely to malfunction.
Mechanical problems: compression and GRM
The worst case scenario is mechanical damage inside the engine, and if the tripping is accompanied by knocks or metal clanching, the diagnosis should be done immediately. compression in cylinders.
Low compression can be caused by:
| Reason. | Symptoms | Elimination method |
|---|---|---|
| Laceration of the valve | Trouting, cotton, power loss | Valve replacement, laundry |
| Rings in the rings | High oil consumption, smoke | Rings removal or replacement |
| HBC gasket breakdown | White smoke, bubbling in the expansion tank | Replacement of the HBC gasket |
| Cylinder-piston wear | Knock, low compression in all cylinders | Major repairs to the engine |
The compression test is done with a compressometer on a warmed-up engine. If one of the cylinders has a pressure that is significantly lower than normal (less than 10-11 atmospheres for the Niva), you need to find out the cause. Pouring a small amount of oil into the candle hole can help diagnose the problem: if the compression grows, then the rings are worn out; if not, the valve problem.
⚠️ Warning: Operating a low-compression or punched-out GBC engine can lead to a piston jamming or overheating of the cylinder head.
Diagnosis with ECU and scanner
Modern injection engine Niva Chevrolet It's self-diagnostic, and when you have a ignition failure, it lights up. Check Engine The error code can be read by using a diagnostic scanner (OBDII) that connects to the connector under the torpedo.
The most common error codes that indicate triplets are:
- 🔢 P0300: Accidental/multiple ignition failures.
- 🔢 P0301-P0304 - ignition gaps in a particular cylinder (the number indicates the cylinder number).
- 🔢 P0171/P0172 is a mixture that is too poor or rich.
Using a scanner allows you to not guess, but to determine exactly which cylinder the gaps occur in, which saves you time and money on parts. However, it is worth remembering that the scanner shows the effect, not always the cause, so a comprehensive approach to diagnosis remains relevant.
Exclusion method: search for a faulty cylinder
If you don't have a scanner on hand, you can use the old proven method of exclusion. On the engine running, alternately remove the connectors from the nozzles or candle caps (caution!).
If you have a good cylinder, the engine speed will fall and the work will become even more unstable, and if you turn off a particular cylinder, the nature of the engine does not change, then this cylinder did not work in the first place, and this is where you need to look for the cause of the malfunction.
When you remove the high-voltage wire, hold on to the cap, not the wire itself, so that you don't damage the conductive vein or get electrocuted. Use dry rags or dielectric mites.
Once the problem cylinder is detected, the algorithm is simple: we swap the candle and the wire with the adjacent cylinder, if the triplica moved along with the part, the cause is found, and if it remains in place, we check the compression and the nozzle of this particular cylinder.
Frequently Asked Questions (FAQ)
Can I drive if the engine is running?
Long trips with a melting engine are highly undesirable, unburned fuel gets into the catalyst, causing it to overheat and melt, which will lead to expensive replacement, and the oil in the crankcase is liquefied with gasoline, which accelerates the wear of rubbing parts, you can get to the garage or the service station, but avoid high loads.
Why does the engine only work on a cold engine?
This often indicates problems with the mixture enrichment system during cold start, malfunctioning of the idle regulator or air suction, and the cause can also be candles with an incorrect gap, which give a weak spark to the cold, and after warming up, the gaps change, and the work stabilizes.
How often should I change candles on the Niva Chevrolet?
The resource of ordinary nickel candles is about 20-30 thousand km, platinum or iridium - up to 60-80 thousand km. However, the quality of the engine is greatly affected by the quality of fuel.
Can the engine be affected by bad gasoline?
Yes, it's one of the most common causes: low octane causes detonation, and impurities and water in the fuel disrupt combustion, often enough to produce old gasoline and refuel with quality fuel at a proven station, to the problem disappears.