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stuttering pulsing power

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Old Jun 27th, 2018, 23:44   #1
yannickc
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Default stuttering pulsing power

Hello people,

i have a strange issue :

When i drive eco for a few 10 a 20 miles (like on the highway, cruisecontrol) and then need to accelerate again (like the stoplights after the highway exit) then it happens most of the time the engine start to stutter.

Its like there 0% power at that moment.
Then i need to play with the power en try to go to higher rev to run the engine smooth...

Also strange, as long if i keep driving eco, the problem stays existing while accelerating. But when i start driving sportive the problem disappears ...
Then i can drive as eco as i want, until the problem shows up again.

I notice this problem first shortly after a change of the diesel filter.

So what i tried :
- clean the full diesel filter housing (maybe dust on the rubber and leaking?)
- change the fuel line from diesel filter to diesel pump on engine. (rubber was not 100% ok )



I also made a log while driving :


These was with 50% throttle in 2th gear (stuttering appears )



These was 50% trottle at 3th gear , first it stutters (first block)
At the last block, it only stutters the first seconds and then it runs smooth....


also interesting :
I read a error code from 300 miles ago :
284: ECM-0002 Fuel volume control valve. Faulty signal
But the error was not active at the moment while testing...
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Old Jun 28th, 2018, 11:27   #2
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Check for boost leaks on the hoses leading to the throttle body.
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Old Jul 9th, 2018, 23:03   #3
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Quote:
Originally Posted by Yobbo View Post
Check for boost leaks on the hoses leading to the throttle body.

Thank you for your reply,

There are no boost leaks.
Turbo is running fine on full pressure.

Also the EGR is blanked out and DPF is programmed out either.

I talked to a few people in the mean time and the all think in the direction of a bad fuel pressure/volume regulator.

I just buy the fuel pressure and fuel volume regulator online and install these today.

Now i need to test a while to be sure about the outcome.

i keep you guys updated!
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Old Jul 10th, 2018, 23:33   #4
yannickc
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Update :

Yesterday a i replaced my fuel pressure AND fuel volume regulator.
I drive 70km on a very easy tempo without any issues.
Today , i drive it again and the problem appears
I need to drive sportive to get the problem disappear for a while (works every time)

So this was not a fix for the problem.
But i have the idea the car runs a little bit better.
It looks likes it responds better on throttle and pickup more easily from lower revs. Also it looks like the mileage/usage is better.
So it looks like 200 euros on parts was not all for notting..

Maybe important info :
I noticed this problem first time a few months ago.
This was very short after a new diesel filter...

I cleaned out my diesel filter house already and replaced a fuel line with a bad rubber connection. There are no air bubbles for so far i can see.

But what if the new filter for example is more resistance then the old one?
Thats why i going to replace the filter with a new original one...
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Old Jul 11th, 2018, 23:45   #5
yannickc
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Update, just changed the "old" (about 6 months) dieselfilter with a new original one.
The old one was a bosch filter.

Wat i noticed is that the old filter has mush more resistance then the original new one. I would say double resistance in compare to the new one..

That was very strange and looks not positive for a good dieselflow.
So now i have to wait and see with this new filter.

Keep you guys updated ...
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Old Jul 20th, 2018, 18:42   #6
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Any news on this?
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Old Jul 23rd, 2018, 01:33   #7
yannickc
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Yes, it wasn’t the fuel filter.
I’m still looking for the problem.

But this weekend I’m did some big changes in order to (hopefully) repair this problem.
In the mean time a also noticed a sounds that wasn’t there before :

https://www.youtube.com/watch?v=Tyg9OL-A2zc
You need to set your volume loud enough to hear this.
It like an air whistle. Not fully related on engine RPM.
If I put the throttle the sounds disappears. But for example if a drive in 3 the gear and I let the car roll out, the sound comes up around 2000 RPM. It looks like it coming from the EGR cooler, buts its hard to locate.

I also noticed a lack of throttle response. There was power, but whit a little delay.
It was for example hard to accelerate fast from 0-100km/u without power dips between the gears.

The next thing I noticed was oil dirt on my fuel lines at the bottom of the car.
There was a small leakage on the connection (maybe by friction, and then rust…) in the engine bay.
Changed both fuel and return fuel line. But also this was not fixing the stuttering problem.

Next thing I checked was the fuel tank. But there was nothing special to see.
So also no solution on this side.

At this point I started to get worrying. The next part in line is the fuel pump..
A very expansive part. But luck was on my side this weekend. I was able to get a full engine with fuel pump and injectors for only 200 euros… So I take my changes and just buy this engine and replaced the fuel pump.

I also cleaned out the egr cooler (not egr valve) with a bit of brakespray.
And also changed the fuel pressure sensor on the rail.


First impression was the sound was disappeared. I’m not sure it was the pump or the egr cooler.
But the EGR is blanked off, so normally there is no change of air passing by.. I’m also not convinced my brake spray make a big difference… So was the sounds from the old pump and maybe amplified on the egr cooler? (as a soundbox…) I don’t really know, but the sound is fixed….

I also noticed a increase of throttle response, but after a few test drives. The problems appears again….

In my frustration I just put on my bad shoes and dissemble the injectors from the donor engine and installed them on my v50. This is the last part in the whole fuel system….
I had a little of problems with fuel leaking, but after a couple of retries it looks ok.
I also need to change the injector class code in Vida. The original one’s was class 6, the donor parts are class 5. Luckily the engine started almost directly and runs smooth….

I did a couple of test drives with each time a 15min brake (because a noticed I was happing a lot when the car was stopped for like 15min and take it for a drive again). So for I can not reproduce the problem. So I’m living on hope now….


It is btw possible , if the fuel pump was broken there flows metal parts from the pump to the injectors and damaged the injectors…


So if this is the solution I’m pretty shore the fuel pump is also died and make collateral damage to the injectors… But then the question is, why is the fuel pump damaged.
Maybe by to mush air in the system?

I keep you up to date….
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Old Jul 24th, 2018, 10:47   #8
yannickc
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So i replaced the injectors.
Engine runs fine for 2 day until today.
Problem is back again
I F* replaced the whole fuel system....

Next upcoming test:
- Crankshaft sensor
- camshaft sensor
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Old Jul 27th, 2018, 17:35   #9
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update, i didn't change the cam and crankshaft sensor (yet).
Last time after the problem was back again, i was able to read a ECM-0002 error code from that day.

ECM-0002 means faulty signal on the Fuel volume control valve.

But i replaced this part before my pump.
And after replacing the pump, it is again another fuel valve.

So now my hopes are on a bad connection. I changed the connector together with the last 5cm of cable.

For now the car is running for 3 days now without stuttering.
But it is way to early to be sure of this fixed the problem.

I keep you guys up to date ....
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Old Jul 29th, 2018, 20:01   #10
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What diagnostics are you using?
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