hi..

I have Code P0087 - Low fuel rail pressure Bank 1.

The symptoms are the car will drive normally for a few minutes, then suddenly splutter and then engine will die.
It is then difficult to restart the engine, but once started it will run again for a few minutes until it splutters and dies again.

I changed the fuel filter and the fuel rail pressure sensor already.

I just bought an Autel code reader and did the freeze frame a few days ago.
Not sure how to interpret the data - I can see "Short term fuel trim bank 1 -9.375" - is much lower than bank 2.

Date is pasted below - PDF of data attached.
Can anyone help?


Car is a 2009 XKR 4.2L.

Many thanks
Steve

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Vehicle information
Jaguar 2009 XK (X150)
Freeze frame data (P0087-00)
VIN: SAJAA44G999B31019
Diagnostics time: 2023/09/03 21:34
Path: Automatic selection > Diagnosis > Auto scan > Read codes >
NO.255
The last time that a system malfunction was detected.
Trouble code (fault) that caused required freeze frame data
storage 135

Fuel system status for bank 1 2
Fuel system status for bank 2 2
Calculated load value 28.235 pct
Engine coolant temperature 103 °C
Short term fuel trim bank 1 -9.375 pct
Long term fuel trim bank 1 0.000 pct
Short term fuel trim bank 2 -0.781 pct
Long term fuel trim bank 2 0.000 pct
Fuel rail pressure - Gauge 219 Pa
Manifold absolute pressure sensor 46 Pa
Engine speed 620.00 rpm
Vehicle speed 0 kph
Ignition timing advance for cylinder 1 9.5 °
Intake air temperature 67 °C
Mass air flow 6.87 g/s
Absolute throttle position 13.333 pct
Commanded secondary air status - Upstream of first catalytic
converter No
Commanded secondary air status - Downstream of first
catalytic converter inlet No
Commanded secondary air status - Atmosphere/off Yes
Time since the engine started. 12
Commanded exhaust gas recirculation 0.000 pct
Exhaust gas recirculation error 0.000 pct
Commanded evaporative purge 0.000 pct
Fuel level input 77.647 pct
Barometric pressure 101 Pa
Control module voltage 12.246 V
Absolute load value 26.275 pct
Commanded equivalence ratio. 0.992
Relative throttle position 2.353 pct
Ambient air temperature 38 °C
Absolute throttle position B 30.980 pct
Accelerator pedal position sensor - Circuit D 13.333 pct
Accelerator pedal position sensor - Circuit E 32.157 pct
Commanded throttle actuator control 20.392 pct
Sensor power supply monitor 0.000 V
Exhaust gas recirculation cooler - Bypass valve position -
Measured 7.059 pct
Autel VEHICLE DIAGNOSTIC REPORT
www.autel.com Copyright 2021 Autel Page 2

 

What I'm confused about is code "P0087 - Low fuel rail pressure Bank 1".... yet "Short term fuel trim bank 1 = -9%"

So ECU thinks the mix is too rich (too much fuel) - but the P0087 code is not enough fuel?

 

skewed frp, bad pump and or fpdm will do that

if you didn’t use a ford frp you will dig yourself a deeper hole

 

hi, sorry for my ignorance.. what is FRP?
I'm guessing Fuel Rail Pressure?

I can look at getting a replacement FPDM.

The readings below are from the ECU via my scan tool.. I didn't physically check the pressure.
I have replaced the fuel rail pressure sensor already.. so presumed the reading would be accurate.

 

Hi @MuscatCat Yes he means fuel rail pressure. Your reading is showing pa (Pascal) of 219 which equates to .031 PSI. I presume that's what the pa is representing in your Autel output. Normal fuel rail pressure is 65 psi.

 

Ahh.. didn't realise it was in Pascal!
I'll change the settings next time.

Guess I need to check the electrical connection to the pump somehow.
I have the back seats out and can see the connector, just need to work out how I can test it..

I can't hear the pump turn on (not sure what I should be hearing).. but the car runs for a few of minutes after starting.. so it seems its not completely dead (if it is failing)..