My Fiat Siena 350000 km, occasional deceleration stalls.

How is the idle speed, and is the car shaking badly before turning off?

If it is an idle problem, there are many possibilities of dead fire, you can simply try to change the spark plug, change the battery, you can add fuel injector cleaner when refueling, if it is a manual car, see if it is a clutch problem.

Besides, the car problem should be found in the 4S shop, not our people, otherwise why do you want him to go to the 4S point?

There are a few places to look at: the oil pump, the crankshaft sensor, the ignition coil, the spark plug insurance.

80% of this kind of problem you have is in the circuit system. Don't wash the fuel injector too much, that thing will be as addictive as smoking a big cigarette, and the car will be washed more and more. I specialize in car repair. If you are in Beijing, you can leave me a message and I will help you take a look.

There are many reasons for this phenomenon, and the fault code can be dropped first with a self-diagnosis system. Check whether the throttle position sensor signal is normal. Deceleration and stalling are most likely caused by the mixture being too thick.

The main reasons for the overconcentration of the mixture are; 1ECU did not receive a deceleration signal, so the injector could not complete the deceleration and cut off the oil, and 2ECU received the signal but the injector leaked oil and the mixture was too thick and caused the engine to stall.

The car is too old and it's time to get rid of it.

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Guangzhou Honda's Fit, Sidi.

Dongfeng Honda's Civic.

Modern Elantra , Accent, Sotana.

Toyota's Vios, Corolla.

Nissan's Tiida, Tiida, Sunshine Mazda's Fumilai.

Citroën's Elysée, Beverly.

Logos of Volkswagen Polo, Bora, Golf, Jetta, Jinto, Jinqing, Santana 3000, Sutar, Santana, Gower.

Chery's A5 and Son of the East and Fengyun and Qiyun.

Ford's Focus, Fiesta.

Chevrolet's journey.

Buick's Triumph, Lefeng, Lepin, and Sail.

Lingshuai and Lancer in the southeast.

The bright and century star of the red flag.

Kia's Maxima, Cerato, and Far Ships.

Fiat's Siena, Palio, Pyrand, Palio. The majesty of the weekend wind FAW, Xiali.

Brilliance's Junpai Qingjie, China, and Zunchi.

Suzuki's swifts.

BYD's F3

Lifan 502 and so on.

In addition to the poor cabin sound insulation and interior, the 2nd generation of Fumilai is not bad.

I recommend European and American models, such as Jetta, which has been in the domestic Red Brigade for decades, and is a car that pays attention to connotation. After all, the safety factor of Japanese cars is still not comparable, and Japanese cars are still very good in other aspects, such as Japanese cars have advantages in terms of fuel economy and humanization. Korean cars, without comment, Sotana and Elantra are very popular to buy, and they should be dismantled well.

Domestic ones may have small problems, but they are cheaper, and like Junjie, the appearance is absolutely good-looking, but it is pleasant, and the Son of the East is also like this, and the configuration also has advantages in the same class. American cars are relatively big, waste oil, and the quality is okay. Recommend Beverly, Jetta, Santana, Tiida, Junjie, Son of the East, Son, Solana, Elantra, Serratu, Sail, Lancer, Stidi, Vios, Xiali, Siena, Fox, Bora, 206, Formira, Elysée, Polo.

That's it, especially for automatic.

Hello, the question you said is not clear enough Can only lead Chi simple Tongzhou told you, if you don't have time to go to the repair shop to test the computer Then prepare a 10 wrench to remove the negative electrode of the battery Thirty Huai wheel Li seconds to install it and try it, if you have time, go directly to test the computer You don't understand, I can't give you a clear answer [If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

Mine is not bright, the light is not normal, there is leakage, the battery will shine when parking for a long time, it is recommended to disconnect the negative current should be less than 20 milliamperes, and it is not normal if it is greater than this number.

For more information, please refer to Ekcar.

Overhaul to ensure quality, if there is such a case, you can not give money.

The overhaul is only to repair the mechanical department, and if the mechanical part is okay, and the circuit department is still faulty, the circuit must be checked.

If the circuit is fine, it is a quality problem of overhaul, rework.

The machine is overhauled, and you should go to the 4S store if you are more expensive, and the noise is not loud.

Drive another 1500 kilometers to change the oil, and then look, new parts need to be run-in.

Use an oscilloscope to detect the waveform signal of the throttle position sensor [The computer reads out the data stream: the throttle opening is 9 degrees if it is not activated. The same is true for the start, but the accelerator pedal sensor does not have any data, and based on this test result, it is necessary to perform a waveform test to see if it is the sensor or the reason for the control line.

If the waveform test does not show normal results, an ohmmeter is used to detect whether the position sensor is exhibiting a continuous change in resistance over the entire open range. If you can't – replace the throttle position sensor; If the throttle detection is normal, then the signal of the line is reasonable. If no signal is provided to the throttle, the control line is detected for conduction.

After confirming that the circuit is normal, determine the grounding status of the computer.

After the above metal detection, there is still no problem, that is, the fault of the ECU.

If there is an air leak between the air flow meter and the throttle valve, check the intake and vacuum lines and check the check valve.

Oil pump? See if the pressure is enough. Take a look at the pressure limiting valve.

Air grid? See if it's reversed, or it's all clogged.

Throttle, oil pressure, ignition coil, crankshaft position sensor. Check the replacement to see if the problem is solved.

Have you ever disassembled the gearbox and the start? Check the crankshaft position sensor, especially the flywheel and clutch here.

If you step on the clutch and the clutch does not turn, so it will not sound, and it is recommended to change the shaft bearing.

The sound of the car should be the sound of the wheel bearing, because the engine sound is small after the oil is collected, so the sound of Weng Weng is revealed.

Same with mine. It is also recently that there has been a sound before, and it is time not to buy it. Bearing problems.

Find a place to specialize in fiat and check the following, don't go to the shop, this car generally has few small faults, or more worry-free!

It is a release bearing. It's useless, my car is also from Siena 03, and the clutch has just been repaired and there is this problem. I'm too lazy to do the assembly problem.

Let's deal with it. There won't be a big problem ... Beijing doesn't know.

There are several professional Fiat maintenance in Wenzhou. After all, the number of holdings is relatively large. Even if it is replaced with a new one, it is not guaranteed that the separation bearing will not have a rattling sound...

It's no problem to open it. Siena is actually a good car. It is a lot more generous than some Japanese cars.

I can't even get a new car out now. Polo is also disappointed. Seems to be off topic...

Use the cylinder pressure gauge to measure whether there is cylinder pressure, if there is no cylinder pressure, adjust the valve, check the inside, there is cylinder pressure, and look at the timing, if it is all right, it is the problem of spark race, ignition coil, and fuel injector.