All Things Mk5 > How to Guides / Troubleshooting

P0087 Code - Help !

(1/3) > >>

DarrenC95:
Hi everyone just looking for some help, I have recently fitted VIS HPFP Internal Kit to my MK5 GTI and since I have got the P0087 fault code, I have dissembled an reassembled the pump twice to make sure there were no mistakes an everything is perfect on that side

I also drilled the fitting to 5mm as advised by ovidiu at VIS, still no joy

I am doing a K04 Conversion at the minute an the other parts I have fitted are the below could any of these relate to the codes ?

S3 Injectors (With New Seal Kit)
Runner Flap Delete
RS4 Relief Valve

Sent from my SM-G975F using Tapatalk

pudding:
Have you got the latest revision low side pressure sensor?  06E 906 051 K

Cam lobe for the HPFP OK and not worn down?  Cam follower OK?

If the above checks out, you will need to data log the following:

Fuel Pressure (LPFP) - Actual
Fuel Pressure - Requested
Fuel Rail (HPFP) - Actual
Fuel Rail - Requested
Fuel Rail - Difference
Lambda Control

LPFP should sit at 4.5 bar at idle and cruise, and ramp up to 5.5 - 6 bar at higher loads and/or rpm.

HPFP should sit at 50 bar at idle and cruise and ramp up to 109 bar at high load/rpm for stock tune, and 120-130 bar for remaps.

If the LPFP keeps up with demand, it's usually the HPFP.

See what the difference between actual and requested is and how hard lambda control is working to fill in the gaps.

That ought to give you some clues as to where the issue is.

How many data PIDs can that Snap on log at once?  Might be worth doing all the other suspects too, MAF, throttle, engine rpm, boost, timing retard, intake temp etc etc to give you a fuller picture.

DarrenC95:
Thanks for getting back to me, a real headache haha

No the low pressure sensor has never been changed but there was no issue with it beforehand still could be an issue though

No unusual wear on cam and cam Follower was just recently replaced less that 1k kms ago

The issue is I cannot do logs with this Snap On diagnostics, as soon as I go to read measured block values it just says not available so will have to try source a VCDS

I might fit the old internals back into the HPFP to see how it goes

Sent from my SM-G975F using Tapatalk

pudding:
OK no probs.  That is one cause of the error and there was a VW TSB about it some years ago.  That sensor is on it's 3rd revision!

Yeah that is the problem with a lot of generic scanners, they can't read live data on some German cars.  VCDS is definitely worth getting hold of for figuring out stuff like this.  We need to know if there actually is a fuelling shortfall, or if a sensor is lying.

DarrenC95:
Can the new RS4 Relief Valve cause the low rail pressure fault?

Sent from my SM-G975F using Tapatalk

Navigation

[0] Message Index

[#] Next page