Member Since: 01 Jan 2021
Location: Capetown
Posts: 10
Tdv6 jerking and missing after LP pump replaced
My 2005 d3 tdv6 kept going into limp mode under hard acceleration with the code for low fuel pressure, finally the car just cut out while driving and I could hear the LP in the tank was not running, and a check at the Schroder valve showed no fuel coming through, so after removing the tank and fitting a good used original fuel pump from the local landrover guy and refitting of the tank, car started after bleeding and good pressure at the Schroder valve I was back on the road. All seemed good for the first 50km and then my d3 went into limp mode again with a p2288 code for excessive high fuel pressure. I finally got the car out of limp mode and now it has developed a terrible continuous 'jerk or miss' at low rpm and higher speed driving, I have fitted a new filter at the same time that I fitted the LP pump. No one seems to be able to tell me what the problem could be.
Even though the original fuel pump gave limp mode under hard acceleration the car was smooth with no jerk or miss, so since changing the LP pump something has gone wrong and I don't know where to start looking.
Anyone out there have this problem or have an idea what can be the cause. Every time it goes into limp mode now the the Code thrown out is for fuel pressure to high?
With the window down it sounds like driving past a whole row of poles for lack of a better explanation.
Thanks
Last edited by Wayne D on 1st Jan 2021 9:05 am. Edited 1 time in total
1st Jan 2021 7:19 am
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20786
Why fit a used part, when going to the extent of dropping the fuel tank? My D3 Build Thread
Member Since: 24 Dec 2020
Location: Norway
Posts: 107
If you have a fault code on high fuel pressure there is something with the return as when the hp pump try to regulate down pressure but it has nowhere to bleed of to.
1st Jan 2021 11:16 am
Wayne D
Member Since: 01 Jan 2021
Location: Capetown
Posts: 10
aja4x4 wrote:
Check you have the pipes on the right way round on the filter
Hi pipes are correct way on
1st Jan 2021 11:29 am
Wayne D
Member Since: 01 Jan 2021
Location: Capetown
Posts: 10
Disco_Mikey wrote:
Wayne D wrote:
Hi Mikey
Price and availability were contributing factors
How do you known it was 100% good, and it wasn't doing the same fault in the previous car?
Before the pump failed the car was smooth no jerking and the only fault was limp mode at hard acceleration with the code being low fuel pressure, now it's not smooth at all and limp mode code is fuel pressure too high.
1st Jan 2021 11:31 am
Wayne D
Member Since: 01 Jan 2021
Location: Capetown
Posts: 10
Kviasen wrote:
If you have a fault code on high fuel pressure there is something with the return as when the hp pump try to regulate down pressure but it has nowhere to bleed of to.
This sounds feasible but how can I check this, what regulates the pressure, could the small valve on the LP pump in the tank be the cause?
1st Jan 2021 11:34 am
Wayne D
Member Since: 01 Jan 2021
Location: Capetown
Posts: 10
I'm talking about this valve
1st Jan 2021 11:36 am
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20786
Wayne D wrote:
Disco_Mikey wrote:
Wayne D wrote:
Hi Mikey
Price and availability were contributing factors
How do you known it was 100% good, and it wasn't doing the same fault in the previous car?
Before the pump failed the car was smooth no jerking and the only fault was limp mode at hard acceleration with the code being low fuel pressure, now it's not smooth at all and limp mode code is fuel pressure too high.
The original pump failed. I get that
You fit 2nd hand pump, and now you have a hesitation
How do you know the 2nd hand pump is good, and not causing your issue?My D3 Build Thread
Member Since: 24 Dec 2020
Location: Norway
Posts: 107
The pressure control valve is in the high pressure fuel pump.
There can be some bending on the return pipe/hose to tank when removed for change of the lp pump in tank.
1st Jan 2021 12:01 pm
Wayne D
Member Since: 01 Jan 2021
Location: Capetown
Posts: 10
Disco_Mikey wrote:
Wayne D wrote:
Disco_Mikey wrote:
Wayne D wrote:
Hi Mikey
Price and availability were contributing factors
How do you known it was 100% good, and it wasn't doing the same fault in the previous car?
Before the pump failed the car was smooth no jerking and the only fault was limp mode at hard acceleration with the code being low fuel pressure, now it's not smooth at all and limp mode code is fuel pressure too high.
The original pump failed. I get that
You fit 2nd hand pump, and now you have a hesitation
How do you know the 2nd hand pump is good, and not causing your issue?
I checked the pump before installing, and with the old pump there was just a dribble out of the Schrader valve, with the 'new pump' I get a squirt about 2.5cm high out the Schrader valve, therefore in my mind pump is working 100% more effective than the old.
1st Jan 2021 12:21 pm
Wayne D
Member Since: 01 Jan 2021
Location: Capetown
Posts: 10
Could this valve on the LP pump be a problem?
Click image to enlarge
1st Jan 2021 12:24 pm
Wayne D
Member Since: 01 Jan 2021
Location: Capetown
Posts: 10
Kviasen wrote:
The pressure control valve is in the high pressure fuel pump.
There can be some bending on the return pipe/hose to tank when removed for change of the lp pump in tank.
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