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Volvo XC90

Volvo XC90 1

Without keyword

Dragged in tow. Diesel engine, five cylinders, the car is not quite old – 2008 release. The client was very upset: “I was driving, I was driving. Then the car died out. I turned it, I turned it on. I drove to the house and everything didn’t start anymore”.

Actions in this situation have been worked out: first primary diagnosis.

Not a fact, of course, but sometimes during the initial diagnosis something can come out that will give the necessary impetus in the right direction.

And here there are no errors. By the way, this is not disappointment, this is the result, because it makes you think in the right direction, for example: “You need to dig not in the direction of“ deep electronics ”, but in the direction of“ something mechanical and trivial. ”So we do: the start key , scrolling – there is no start. But what is there? Only “instant fuel injection”.

But we are not in a hurry to draw conclusions. It would be nice to check the regeneration system, the EGR valve. What happens: it sticks in the open position and then the engine, in principle, cannot be started. It’s okay here. Then instructively check the particulate filter “for clogging.” Result: “zero clogging”.

And all the checks carried out are not random actions, these are the steps that you need to go through to get an idea of ​​the malfunction.

And now you can move on to the main thing: remove the air pipe and try to start the engine with “external fuel”.

The result is satisfactory: as long as the fuel is supplied, the engine is running; if there is no fuel, it is not running. What is the logical conclusion to follow? Correct: “We must watch the nozzle”.

We hang up the motor tester, do a test run and do two things at the same time: we look at the impulses and tactilely (fingers on the nozzle) we check the sensing response of the nozzles. They click, but the motor is silent. Then we pull out one nozzle and twist it the other way around so that the spray goes into the air and to the side (visual inspection).

And what happens: there are pulses, the nozzles click, the fingers feel the response, and nothing comes from the sprayers. Not a bit.

This means that the time has come for experiments: using simple manipulation, we increase the nozzle opening time by several times and an ordinary miracle happens in our eyes – barely noticeable “torches” of the sprayed diesel fuel appear from the nozzles. The logical conclusion: “Injectors are faulty” (clogged, tarred, or something else, in any case, there is an “obstruction” of the injectors, they do not pass the required amount of fuel to start the engine).

Our further actions are run-in: it is always useful to have people of other specialties in good acquaintances – in the city of Gzhel there is a special for nozzles, Sergey. His knowledge + experience + worthy equipment allows diagnosing and restoring elements of diesel fuel equipment.

Sergey concluded that “nozzle parameters are below acceptable tolerance limits.” Strange as it may seem, we had a “piano in the bushes” – a set of working nozzles for this motor. They were installed on the motor, the key to start – the motor started without problems.

So, we can conclude the final: “The problem is in the nozzles, they require replacement.” Why not repair?

Sergey, for the sake of interest and to understand the problem, opened one of the nozzles. He brought it to his face, grimaced and said that “it smells of diesel fuel, but there is a strong smell of something else, very chemical. Most likely, the diesel fuel was mixed with something.” He tried to shake the locking needle. I tried for a long time, I even wanted to pick it out with thin tweezers, but it didn’t work out: “I stuck it!”.

It was hard to say what was in the diesel fuel on which the motor died, drying oil, glue, super-glue … but it was something very sticky, able to glue metal to metal.

A couple of years ago, I already spoke about such a nuance for diesel car owners as “refuel with high-quality diesel fuel”: “MMC Fuso. The history of a gas station”
And I will quote: “When refueling, we always play roulette, no one can guarantee that the fuel is high quality, as stated in the certificate.” I won’t persuade anyone and say that “Saving at a gas station is more expensive for yourself! If not immediately, then IT will certainly come out, you can save on matches, but not on fuel for your car”.

Words will remain words, but maybe such a short financial calculation will make owners of diesel (and not only!) Cars think:
One used nozzle costs 8 thousand rubles.
There are five of them on this motor, which means we multiply and get 40,000 rubles.
New nozzles cost 17,000 rubles. We multiply and get 85,000 rubles.
We will add our work here. Beyond the brackets, of course, there remains some “lost profit” of the client himself, who, due to the lack of a car, was unable to do something important and in some way he necessarily lost.

Conclusion: “You need to refuel at proven gas stations!”.
But, alas, I can’t advise anything, so far the choice of a “reliable gas station” as a game of fraudulent roulette: “You can bet, but will you win …”.


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