In the morning I start the car, as it should be, when cold, the rpm is about 1300-1400 and as it warms up, it gradually drops to 900 BUT, as soon as you drive a little, the rpm rises to 1100 and does not fall! Yesterday I replaced the idle speed sensor and the throttle sensor, the effect is zero, everything is as it was and remains! 1 thousand down the drain(((What is the problem in the ECU control unit? Maybe someone had this?
Price: 1,000 ₽ Mileage: 131,000 km
Troubleshooting Methods
You can solve problems with jumps and floating speeds yourself:
- To confirm and eliminate the possibility of air leaks from the outside, check the supply system for leaks. Using a compressor or pump, supply air to the removed hose placed in water. This allows cracks to be detected.
- The resistance of the IAC is measured. Values within 40-80 Ohms indicate that the device is not working.
- During the diagnostic process, the crankcase gas ventilation valve is cleaned. It is removed and washed with kerosene or carburetor cleaner.
- When sensors fail, they are not repaired, but replaced immediately.
- If the throttle valve requires washing and removal, it is recommended to entrust the job to a specialist. Without removing the damper, you can wash the part yourself using a cleaning aerosol.
- Adjust the idle speed by setting the “quantity” and “quality” screws on the carburetor. Clean the nozzle with an aerosol and blow it out with compressed air.
Important! All conductive contacts are disconnected from the throttle valve. In case of heavy contamination, after cleaning, set the required gap.
In most cases, eliminating these causes helps to get rid of floating speed.
What's the result?
As you can see, at the initial stage of diagnosis, if the engine twitches at idle, you should start with the simplest:
- check spark plugs and high-voltage wires;
- assess the condition of the air and fuel filter;
- if the car has a carburetor, clean and adjust the carburetor;
- on the injector, check and wash the nozzles;
- perform computer diagnostics of the engine;
Finally, we note that on cars with
The cause of the twitching may be problems with gas equipment or the settings/firmware of the gas control unit.
If the diesel engine jerks at idle, then problems with the injection pump should also be added to the general list of possible problems. The pump has many moving elements, damage to which or clogging can also lead to jerking or obvious tripping in the cylinders.
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In idle mode and at low speeds, the engine shakes: possible reasons for the unstable operation of the power unit. Self-diagnosis methods.
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Engine trouble: what is it?
Engine trouble: symptoms. Why does tripping occur and how to find the reason why the motor starts to trip. Checking power, ignition, compression, etc.
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Why don't the revs drop?
There are quite a lot of reasons for the appearance of such an unpleasant phenomenon, let's try to understand this issue together and decide how to get out of this situation.
Most often, in injection engines, speed reduction does not occur due to the fault of the throttle assembly, in which contamination occurs. Old engines, worn out by time, most often suffer from this. Engine oil is released into the power system, it burns in the intake tract and prevents the damper from moving into place. Because of this, an unauthorized supply of the fuel mixture to the engine cylinders occurs, which leads to an increase in idle speed. The solution in this case is quite simple: remove the throttle assembly from the car and thoroughly wash it in kerosene, and then, after drying it, install it back. In some cases, it can be cleaned without dismantling it. It is enough to treat this unit with carburetor cleaning fluid and the problem will disappear.
Another culprit for over-revving may be the throttle position sensor. It is a kind of variable resistor, in which the movable contact moves along a conductive path, generating a pulse to the electronic control unit. An incorrect signal can cause an increased amount of fuel mixture to be supplied to the cylinders, and this increases the crankshaft speed.
It is impossible not to say a few words about such a unit as the idle speed sensor. It starts working when you turn the key in the ignition switch. At this time, the movable rod of this sensor extends into the calibration hole. It is located on the throttle assembly and serves to regulate the flow of the air mixture.
There is another device that can affect the change in idle speed. This is a mass air flow sensor that controls the flow of air mass and issues control pulses to the idle speed sensor.
Chevrolet Niva Raises Idle to Hot by 1200
#1 AlexeyV
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Hello. Shniva signed up for the weekend and just arrived at the gate. I'm a little confused for some reason. Shniva with throttle cable. The problem is that when it’s hot (from the words, when it’s cold it’s like “not so”?) after starting it stays at 800 for 15-20 seconds. then he confidently raises it to 1200 and holds it. Very similar to some kind of software emergency mode. BUT the check does not light up, according to the onboard (according to the owner) the error is increased idle speed. The owner replaced the TPS and IAC (they are new) - it didn’t help. I started it myself - 15 seconds is the norm - then one or two boosts up to 1200 and that’s how it stands..
The car arrives on the weekend, now even the scanner couldn’t pick it up - there’s no time, so for the lack of input, PLEASE UNDERSTAND AND FORGIVE! If you want to scold, DON’T)))) I’ll post the introductory notes on Saturday.
It is clear that you need to look at EVERYTHING - mass air flow sensor, diesel engine, remote control inlet, mass, etc., etc. Maybe someone has encountered EXACTLY such a glitch with shnivy, which side should I start with? And then suddenly there is some kind of “narrowly targeted malfunction” that manifests itself like this.
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Post edited by AlexeyV: 05 February 2014 — 08:31
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Symptoms of a problem
- The engine stalls when changing gear. When a manual driver releases the gas pedal, the engine goes into idle mode and if the device is not operating correctly, the air supply channel may be completely blocked.
- The opposite problem is excessive amounts of XX. Without load, the internal combustion engine works too actively, which leads to excessive fuel consumption and premature wear of the moving pairs.
- The engine stalls when warming up or cold starting.
- The crankshaft speed constantly fluctuates without applying a load. You can also hear it. Experienced drivers can determine the stability of its operation by listening to the sound of the engine.
Why do you need a properly set idle speed?
When it comes to a car, the concept of idling can be attributed to the operation of the engine when the gear is off or when the clutch pedal is depressed. In such cases, the engine runs without load, that is, there is no transmission of torque from the power plant to the drive wheels. For different engines, idle speed can range from 600 to 1000 rpm.
If their indicator is less than the recommended value, the engine will stop when the clutch pedal is pressed. An increase in their number, in addition to a significant increase in gasoline consumption, leads to accelerated wear of engine parts. Therefore, it is so important to maintain their number in the recommended range.
Idle speed adjustment is carried out by several components and assemblies installed on the vehicle. These include an injector, a fuel pump, and various sensors, which can be mechanical or electronic. This also includes the throttle valve, fuel pressure regulator and some other devices.
The number of revolutions is greatly influenced by the opening angle of the throttle valve, which regulates the amount of air entering the engine power system. The idle air valve also takes part in mixture formation, which is needed to provide air supply bypassing the throttle valve. In some cases, an increase in their number may be caused by an incorrectly adjusted gas pedal drive.
Niva Chevrolet revs fluctuate when cold
Replacing the idle speed sensor on a Chevrolet Niva
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Home » Clips » Chevrolet Niva revs fluctuate when cold
A few more words about over-revving
If servicing the above components does not lead to the restoration of idle speed, you should pay attention to another component, which is the electronic control unit, which drivers call among themselves “brains”. Problems in its operation in many cases lead to such failures. If this is the case, then the ECU is simply replaced with a new unit.
To prevent this from happening to your car, follow the deadlines and carry out proper maintenance of the car and its systems. Use high-quality operating fluids, then you will not have a question about why the engine speed on the Chevrolet Niva does not reset. We hope that if such a malfunction occurs, the article will help in resolving it.
Source
Main reasons
When starting, the engine can reach higher speeds to warm up faster. This manifests itself especially often in winter. But after some time, after reaching the minimum operating temperature, the electronic control unit is activated, which reduces the engine speed to normal. If this does not happen, then it is urgent to look for the reasons causing this problem.
Higher speeds indicate more intense engine operation, which can lead to a wide variety of consequences. Long-term operation may cause the engine temperature to rise significantly, resulting in thermal shock. This will cause problems in the operation of the cylinder block. In addition, most components will experience heavy wear and tear due to unstable engine operation and, as a result, accelerated wear. All this will affect the service life of the engine.
Therefore, it is necessary to immediately figure out what reason caused the increase in speed. There are several of them:
- idle speed sensor
- throttle sensor
- Problems with throttle angle adjustment
- failure of the engine temperature sensor
- air entering through a damaged intake manifold
- problems with the electronic control unit
Increased idle speed after driving. — Chevrolet Niva, l., year on DRIVE2
The Chevrolet Niva throttle valve is regulated by a special sensor, which, if necessary, closes it, forming a vacuum in the intake system, or opens it, allowing the air mixture to pass through. If the TPS is faulty, then malfunctions occur during idling.
In this case, you need to remove the element and carry out diagnostics. Removing Chevrolet Niva high idle speed First, you need to disconnect the wire block to de-energize sensor 2.
To check its functionality, you need to use a multimeter to measure the voltage between the first and third connectors in the block.
In this case, you need to move the damper position from closed to open. The element itself is fastened with 2 screws, which need to be unscrewed to replace 4. After removing the element, we check whether there is an o-ring left in the seat. You need to check its appearance and if everything is in order, install it in place. These problems are similar to the failure of the throttle sensor and the Chevrolet Niva increased idle speed to the same consequences.
Regulator diagnostics
The functionality of the unit is checked after its dismantling. Before work, turn off the power from the battery and place the car on a flat surface. Dismantling is carried out with the ignition turned off. Disassembly order step by step.
- Remove the power supply.
- Using a 19 mm wrench, remove the two fastening bolts.
- Carefully pull out the regulator.
Connect the power plug to the sensor and turn on the ignition. On a working unit, when the ignition is activated, the rod needle will noticeably move. If the rod remains in place, the element is faulty.
Idling on a Chevrolet Niva
At the same time, the electronics takes into account a whole set of parameters: And in no case should you allow the vehicle to be operated with a part that has exhausted its service life. A universal device for diagnosing any car. In some Chevrolet Niva models, the idle speed may sometimes freeze when changing gears.
So, when the neutral is turned on, the speed does not drop below. The error must be looked for in the software of the car’s on-board computer.
And only flashing it in a specialized service can help. Do you still think that diagnosing a car is difficult? If you are reading these lines, it means you are interested in doing something in the car yourself and really saving money, because you already know that: Maybe someone has encountered such a problem.
I changed the throttle body and the throttle body and washed the throttle body. When moving in neutral, the revolutions do not drop, they stay in the area. You stop and the revolutions drop to When the fan is turned on, the revolutions also drop. Diagnostics show everything is normal. Did you put the throttle cable exactly in place?: It throttles on its own, yeah.
I had a Kalina - in Maymax there is such a street of Yunosti, a private sector, I drove along it with the clutch half depressed, the Kalina rows slowly, but I let the clutch slip and it digs, and so it goes, in general there are only meters of road there, well I dropped off the passenger and drove back half-stressed.
About 10 minutes later, I drove halfway and the clutch began to smell sharply. I turned it off, started it up five minutes later and drove off - I pressed the speed a little and immediately went higher, but the wheels didn’t move, somehow I got out of that damn road at those speeds.
Then the asphalt, acceleration - the revs also go up, but the car does not accelerate. I stopped on the side of the road to smoke and think about the situation. After about 10 minutes I start it up and the car drives as if nothing had happened.
This is exactly the same situation that happened a couple of weeks ago. I sinned on the IAC, but why does the speed only hold when coasting, and when stopping it returns to normal? I read somewhere that this kind of bullshit can also come from him. As a result, I bought a new IAC - it’s easier to replace.
I changed it, the problem did not go away. I reset the battery terminal again. But yesterday I went to the car market to buy oil and thought about buying a speed sensor at the same time. This morning everything is fine too. Also, the revs may fluctuate due to the vacuum tank, but most likely this is not the case.
I changed the DMRV and the result was 0.
I changed the speed sensor 0. I turned off the supply of crankcase gases going to the throttle to the throttle and everything seemed to be back to normal. The engine needs to be repaired with excess crankcase gases directly to the bulkhead. How old is the ShNiv, how long is the mileage? Diversant old air flow sensor was covered in oil inside!? Today, at a friend’s house, I looked at how the crankcase gases from the absorber are approaching the throttle in the opposite direction.
Unstable idling niva chevrolet
And today JackieChan caught fire and the revs at idle began to drop almost to , and even the oil light began to light up. I removed the terminal a couple of times - it helped, but for a few minutes, then it all happened again. I decided to put back the old IAC, because the new one was also weird at first, before the weather warmed up. If there are traces of contamination, the damper must be cleaned.
To do this, you need to completely remove the throttle assembly and either replace it if damaged or clean it using special products. In this case, some models will require additional computer diagnostics.
This component most often fails because it is constantly exposed to high temperatures. Therefore, in some cases it is better to start looking for problems there. It is also checked using a multimeter. After replacement, the ECU may need to be cleaned for errors.
The collector itself may also fail if the car has a sufficiently long service life. But more often the gasket fails. In this case, excess air is sucked in.
