[Solved] Volvo V40 1.9 dCi 115HP Engine Shuts Off at Idle - Accelerator Pedal Issues

Damian2805 wrote:

the engine changes the sound

What kind of hard work turns into metallic knocking?

Damian2805 wrote:

Volvo V40 1.9 DCi 115HP. The car goes out at idle after a few minutes, sometimes after a long engine operation. During operation, the engine changes sound, comes for a while and normalizes. The problem is that the accelerator pedal stops working.

Tell me more about the engine. What injection system resides in it? Is this BOSCH, DELPHI or other? Which year? Is any warning light on the desktop lighting up? Does the engine always ignite from the first time even in the greatest frost? Are the revolutions stable, even at all revolutions, and if not in what situations? Does the engine emit any foreign sounds not seen before? Does the engine kick, e.g. when accelerating? Do not suggest your own observation, just let the other person stand on the street or sit in the back seat and observe the smoke opacity. The color and intensity of smoking makes it much easier to make an accurate diagnosis.

Kitten KotBury2

Damian2805 wrote:

I checked the black engine at a standstill as gas is added, but my colleague once told me that when I start it, I kick black so I think that when accelerating the black kick. turnover is not stable because as I watch the indicator it is "swinging".

I suspect fuel injection circuit . Unfortunately, the worst case variant of the injectors can be considered, i.e. pouring fuel into the cylinder .

The most preferred variant is faults control valves inside the injectors in the upper part. If they are worn, the injector may not inject well enough because too much fuel escapes through leaking valves on the transfer to the tank. Hence the sudden weakening of the engine and the lack of response to gas, because pwc does not compress the fuel, which escapes too quickly to the tank. Therefore, the injector overflow should be checked first, about which in a moment.

It is advisable to go to a good mechanic as soon as possible Common Railach and repairing high pressure injectors and pumps.

Should be carried out injector overflow test on the engine. This is always the first step towards solving the problem. I give the link to the YT video showing a simple transfer test. It is possible to make it yourself. https://www.youtube.com/watch?v=GHqlGaclt3w

If the mechanic has the capability, the injectors can be removed and checked on the test bench. Below, I paste a photo from the test on such a device.

It can be clearly seen that three injectors (except the second from the left) overflowed very strongly (excess fuel escapes to the tank, not to the injector tips). Symptoms: starting problems, engine stalling after starting, weakening while driving, reluctant to enter revs. After replacing all three valves with new ones (cost PLN 370 / item - DELPHI system) and washing the injectors in an ultrasonic cleaner - the engine runs like new.

I advise you not to delay the visit to the mechanic, because there is a risk of even burning the piston due to e.g. pouring fuel into the cylinder directly on the piston and possibly scrapping the engine. This is evidenced by black smoking, i.e. not burning fuel due to e.g.. its a small spray. A disturbance in the combustion of "too much fuel" occurs. The picture below shows the damage caused by "spilling" the injector.

Kitten KotBury2