Engine power is getting cut *FIXED*

[ktlstar]

After fitting my rs4 valve, about 3.5-4k the engine will cut out, like fuel cut.     What could i possibly done to have caused this ?    I guess vag- com is first thing to try,or the engine is in limp mOde?

Thanks

[ktlstar]

I ment power is getting cut, and not engine. The engine still runs when it happens!

[PDT]

Log the high pressure fuel block (230) and see whats going on.

[ktlstar]

Will do, at work atm.

Hope i havent damaged anything!

Thanks PDT

[ktlstar]

1 Fault Found:
012555 - Low Pressure Fuel regulation
               P310B - 002 - Fuel Pressure Outside Specification  - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 2
                    Fault Frequency: 2
                    Mileage: 27294 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 10:14:06

             Freeze Frame:
                    RPM: 4775 /min
                    Load: 7.8 %
                    Speed: 101.0 km/h
                    Temperature: 81.0°C
                    Temperature: 9.0°C
                    Absolute Pres.: 1020.0 mbar
                    Voltage: 14.478 V



I will have to log it tomorrow however a scanned showed this, any ideas?

[ktlstar]

Reading about it , looks like the low pressure sensor but also check the cam follower. Interesting!

[ktlstar]

Changed back to the original valve, however the problem still persists....  :(

my fuel is meeting the specified value also.

[ktlstar]

Right my problem is at 3600rpm the fuel pressure drops to 2.00 which is why i think its causing it to cut power. Any ideas?

[bacillus]

That's horrible!   

I would also log block 103 to see if the root of the problem lies with low delivery pressure of fuel from the tank. When did you last change your fuel filter?

[ktlstar]

What values am i looking for on block 103 dude ?

I did it whilst idling and i can remember current fuel pressure was between 4-5 and the  pressure regulator value was -400, when revving it would decrease.

I assume you want me to log whilst trying to get the car to cut power again ?

Engine has only done 15k, so i dont think it has been changed.

[bacillus]

Ideally you want a value of 5 bar at idle probably dropping to around 4.5ish max at high revs. The closer it is to 5 and above the better it is. The fuel filter has an inbuilt relief valve for pressure over 6.2ish bar.

As for the fuel filter, it should be ok at 15k provided there hasn't been loads of crap in your tank.

[ktlstar]

It has only happened since i changed the valve over.

I now reverted back to stock valve.

All i did was, removed the 2 fuel lines that go into the block, 2 on the HPFP, unclip 3 sensor clips, 1 on HPFP, 1 on DV, and 1 just above the DV (ED30 engine).

PCV was also removed.




No leaks at all, you can see from the logs, however it makes a fit at 3600rpm.

[bacillus]

Are things back to normal with the stock valve?

If not then one can only assume that you have inadvertently disturbed something or your electrical connectors aren't all securely home.

Perhaps you could also check the function of the solenoid on your HPFP. You can do this in VCDS by going into the Engine Controller ->> Output Tests ->> and from the drop-down menu Choose "Fuel Pressure Regulator (N276)" and hit Start. This will pulse the solenoid on the pump and you can listen to it click if you have the bonnet open.

[ktlstar]

The problem still persists with stock valve,

the cam lobe is perfect as changed around 2K miles,   

I will try the pump test later tonight, do i want to hear it click i assume (knowing its working)





From what iv gathered its the fuel sensor which is on the HPFP that can be the problem. I can only imaging its the electrical part of the things,, or fuel as gone into a sensor from when i released the pressure/valves. 

[ktlstar]

Could i of damaged anything whilst cranking the engine to get it started ? Obviously it took a while for the engine to start once the valves were swapped over.
Once they did start it struggled to keep alive, gave it a few minutes and the engine starts first time perfect/ idles perfect.