P2293 After changing injector, checked seals, idles fine, stumbles under load.

[xcb789]

Hi all,
Title sums it up really, Changed injector, so had manifold off etc. cannot find anything put together incorrectly, completely out of ideas.
Thanks for any replies.

[GVK]

Fuel pressure problem. https://wiki.ross-tech.com/wiki/index.php/18725/P2293/008851

Do you have VCDS or anything that can monitor the fuel pressures?

Checking Fuel Pressure

Prerequisites:

    Ignition ON
    Engine ON (Idle)
    System voltage at least 11.0 V.
    Coolant Temperature at least 80 °C

[Select]
[01 - Engine]
[Meas. Blocks - 08]
Group 103
[Go!]
Field 1: Fuel Pressure (Low), Specification: 2800...7200 mbar
Field 2: Fuel Pump Adaptation, Specification: -1000...+1000 %
Note:

    Timing chain driven engines such as the CCTA, CBFA and CCTA were phased in during model year 2008. Those engines do not use a G410 (Low) Fuel Pressure Sensor so Measuring Blocks group 103 is not applicable.


Group 106
[Go!]
Field 2: Fuel Rail,Pressure (actual): (A value ≈ 35 to 55% is considered normal at idle)

    A value ≈ 55% to 60% could be considered as an indication of a low fuel pressure concern
    A value above ≈ 60% to 70% usually indicates there is a failure or restriction
    A value fluctuating ≈ 35% to 95% may indicate an intake fuel pump failing
        Causes of low pressure can include:
            Damaged/restricted fuel lines
            Fuel filter issues including restricted/clogged or incorrect part number (wrong pressure relief value)
            Faulty in-tank fuel pump and/or in-tank fuel pump controller. (With critical parts, we encourage customers to use Genuine Factory parts from the dealer's parts department.).


Group 140
[Go!]
Field 3: Fuel Rail Pressure (High), Specification: 25.0...110.0 bar
Increase the Engine Speed while checking this value, the Pressure has to rise with the Engine Speed.

Group 230
[Go!]
Field 1: Specified Fuel Rail Pressure (High)
Field 2: Actual Fuel Rail Pressure (High), Specification: 25.0...110.0 bar
Field 3: Deviation between specified and actual fuel pressure, Specification: max. 5.0 bar

    This video may be helpful:

[Done, Go Back]
[Close Controller, Go Back - 06]

[mjmallia]

As above........using something like VCDS will help.  You can also see which cylinder(s) are playing up, the low or high fuel pump, stuck air flap runner on the intake manifold, ..........could be a number of things to be honest.

Seals should be changed every time the injectors are messed with due to being one time use supposedly.  I usually use the elring ones as they are a lot cheaper than the VW genuine ones and most probably the OEM suppliers

[xcb789]

Thanks for replies, Do not have VCDS, will purchase, Since it is a fuel pressure problem occuring right after the Injector change its most likely something messed up during the reassembly/disassembly. Any ideas of things I can check before I have access to VCDS?

[GVK]

Have you checked your cam follower/fuel pump tappet?

Gendan for VCDS in UK (genuine cable)

https://www.gendan.co.uk/product_VCV23.html

[mjmallia]

Was the replacement injector new or secondhand?
Was it tested before installation?
Was it a genuine one as there are lots of fakes out there.

[xcb789]

Have you checked your cam follower/fuel pump tappet?

Gendan for VCDS in UK (genuine cable)

https://www.gendan.co.uk/product_VCV23.html

VCDS ordered, checked follower today, does not appear concave but also entire head of it is silver, no coating left. New one ordered, cam luckily looks good. Am I right in thinking that it would need to be pretty significantly concaved to be causing my issues so it is unlikely the cause?

[xcb789]

Was the replacement injector new or secondhand?
Was it tested before installation?
Was it a genuine one as there are lots of fakes out there.

Was genuine second hand. seals changed. Not looking forward to the prospect of having to take the manifold off again but if VCDS doesn't help me narrow down to any other cause then I'll have to.

[GVK]

Have you checked your cam follower/fuel pump tappet?

Gendan for VCDS in UK (genuine cable)

https://www.gendan.co.uk/product_VCV23.html

VCDS ordered, checked follower today, does not appear concave but also entire head of it is silver, no coating left. New one ordered, cam luckily looks good. Am I right in thinking that it would need to be pretty significantly concaved to be causing my issues so it is unlikely the cause?

As long as it's not concaved it shouldn't be too bad, worth putting a new one in though.