Renault Kangoo 1.5 dci - sometimes goes out on idle, pressure drops on the ramp

Question

Recently, I have Kangaroo 2005 1.5dci 82km delphi equipment. I have only one small problem with him. The engine sometimes dims or extinguishes only when idling. It doesn't happen when the engine is cold, but only when the temperature starts moving a little. Sometimes 30 times a day (usually...

marekwodniak · Accepted Answer

A colleague had similarly checked what was possible was the high pressure pump. The regulator you have in the pump cost about 340 PLN. I have the year 2002 and there is a fuel regulator in the pump.

daras41 · Accepted Answer

The regulator can also be, but I always start with an overflow injection test, because Delphi valves fall quite often. The regulator is not cheap and I prefer not to change it for free, as it turns out that the injections let go

jankopolo · Accepted Answer

No. 4 is the fuel dose control valve, it is responsible for the amount of fuel delivered to the high pressure section.
While the motor is running, vibrations occur that cause the pins inside the plug to deform after some time.
That is why I suggest bending the pins in the fuel dose control valve plug (No. 4) and the fuel rail pressure sensor.
A damaged or malfunctioning crankshaft position sensor causes significant difficulties in starting the engine, if the camshaft position sensor also works poorly, the engine controller will not give permission for fuel injection.

Anonymous · Accepted Answer

If there is no pollution in this fuel dose control valve, it rarely happens and I have not yet encountered damage to the valve itself, unless it is quite clogged so that such a defect causes, but it is worth checking and the electrician can also interfere, but it rarely happens. Not necessarily associated with starting, because the crankshaft sensor is also dependent on the operation of this valve and a colleague writes that the symptoms occur: So, the disturbance of the crankshaft sensor (due to contamination or its defects), because this crankshaft sensor is responsible for maintaining the pressure in the pump by adjusting the fuel dose and if at the moment the crankshaft sensor hangs, it automatically reduces the fuel pressure, it often happens . (And the pumpmen's hands are blurring for lack of her knowledge.) In contrast, damage to the camshaft sensor as above colleague wrote, because it will not be where and how he injected fuel into the combustion chamber, which also has difficulty starting or running the engine. So it is worth to calmly watch and if you have the opportunity, give errors, because they must be with these symptoms. In these injection systems, it is recommended to add 2T lubricants to the fuel to prevent chafing of the injection element, because Delphi has too fragile parts and should be taken care of and the fuel filter replaced in time. Ps. The interface can be good, you just need to understand it.

daras41 · Answer

Start with the injection overflow test.

Piotsztykiii · Answer

okay i will do the test but i have to do it during this fading or even if it goes well i can do it

daras41 · Answer

Do it on a hot engine.

jankopolo · Answer

When starting the engine, the pressure on the fuel rail should be 150 bar, at idle no less than 240 bar.
Remove the plug from the fuel pressure sensor on the fuel rail and correct the pins (bend) then do the same on the fuel dose control valve plug mounted on the rear wall of the high pressure pump.

Anonymous · Answer

The fuel temperature regulator and sensor should be and I should start checking from the position sensor of the shaft and camshaft. Because from what you describe, it looks and entry into the oscilloscope should explain everything and you will also notice the injection time. It's best to connect it to the computer before you remove anything, because if you find a stupid crankshaft sensor, then it makes no sense to disassemble, because pouring injections you would not fire it once.

Piotsztykiii · Answer

Thanks to everyone for your interest.
The idle pressure is about 280 bar. Declines occur only when it dims or goes out. When the engine is running correctly, there are no idle drops. I have refueled twice with better fuel, drove a bit and it's a little better. It only dims and does not go out and it happens less and less often. Today, for example, it has only faded twice. It looks like something is hanging. I also suspected this pressure sensor in the ramp or the fuel pressure regulator but I came across such a photo on some forum and it probably confused me:

1 Pre-pump
2 High pressure pump
3 Temperature sensor
4 Low pressure cylinder
5 Hydraulic head
6 Fastening holes
7 Oil inlet
driving
8 Oil return system
driving
9 High exit
pressure

I understand that No. 4 is this regulator, right?
And if there was something wrong with the injections, wouldn't there be other symptoms? As I wrote, there are no other problems, the engine is really cool.

Piotsztykiii · Answer

Cool. I podoginają and write what and how. I didn't suspect the shaft sensor because I know from experience with gasoline players that it would be problems with starting.

Piotsztykiii · Answer

Hello. The problem is practically no longer present. Practically, because it has not faded for two days

I have prophylactically improved the pins in the sensor and valve. Maybe I am still tempted to add some fuel, I will just find out how effective it is. Also, thank you all for your help, in the future if the problem returns I will know where to look for a fault.
As for the interface, I understand what the individual parameters mean, but I'm not sure how accurate it is in live data. But I think it's cool. There are no saved errors but I have to look for some good program for Renault on elm 327 maybe something will be there.
greetings

jankopolo · Answer

Fuel additive, a smart move. Do not look for anything in the shops order a professional preparation from the website:

Anonymous · Answer

In the given link I do not recommend this agent for this fuel system, because you will damage it faster than by using 2T oil or a special mixol, what such oils are safe than using cleaning agents. Because, these oils are to lubricate, not clean it, it's like you would use kerosene or other means of this type, which in my opinion and proven means such as in this link is not safe for this injection system.

jankopolo · Answer

I had the opportunity to clean DELPHI injectors after applying the 2T treatment.
Only 2 pieces were saved. Carbon deposits from burnt 2T oil rendered them perfectly harmless.
The difference in the amount of fuel dose at different speeds reached 35%.

Anonymous · Answer

The use of 2T oil is for lubrication, not for repair or cleaning and you should always use 2T oil for the life of the car. In any case, such delphi systems need lubrication and there is nothing to clean there, because, for example, he got filings (before using 2T oil), there is no rescue and unfortunately it remains to disassemble and clean the injectors and the entire fuel system with the fuel tank.

pax1990 · Answer

I will refresh the topic a bit because I have a similar problem, 1.5dci, after heating it does not want to start, it catches but does not fire, after unplugging the temperature sensor it fires, the pressure at start-up is about 350 bar. I changed the temperature sensor

Renault Kangoo 1.5 dci - sometimes goes out on idle, pressure drops on the ramp

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