Member Since: 03 Aug 2012
Location: Reigate
Posts: 91
Limp mode on acceleration
Afternoon all
This question relates to my son's 2007 D3 auto TDV6.
The motor had been off colour of late. Nothing specific, but not running well (when compared to mine at least) He took some advice locally and as a result replaced the fuel pressure sensor. He reported that the car seemed to be running much better....until it spluttered to a halt, having cut out.
Diesel everywhere under the bonnet, traced to the fuel rail and duly repaired by the attending AA man, at which point he was back on his way.
What's happening now is that if he boots it when the car is at normal op temp. it goes into limp mode with the 3 amigo's and a range of faults - transmission, parking brake, engine fault. All clear on restart. When I took it out earlier and read the codes, the only one showing was U2023.
I appreciate that this could be a number of things (high pressure fuel pump springs to mind), but I wondered whether anyone had experienced similar and had pin-pointed a solutions or some things to try?
2nd Jul 2024 4:13 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5093
Replace the fuel filter with a genuine item. If that doesn't resolve it you'll need to consider the lpfp in the tank. Again, genuine or a Britpart replacement is fine. There's plenty written on here regarding testing it if you do a search.
The hpfp should be your last port of call. yµ (idµ - eAµ) ψ=mψ
2nd Jul 2024 8:40 pm
zig
Member Since: 09 Sep 2005
Location: Scotland
Posts: 650
Had a problem last November with the vehicle going into limp mode when the accelerator was pushed beyond a certain level. Restarting the vehicle cleared the limp mode only for it to reappear once again on accelerating. The fuel filter was changed and the problem went away.
3rd Jul 2024 10:44 pm
lemansfan
Member Since: 03 Aug 2012
Location: Reigate
Posts: 91
Limp mode on acceleration
The plot thickens with my son's 2007 D3 TDV6.
The original issue was that it would go into limp mode/3 amigo's under hard acceleration. The situation has deteriorated insofar as errors are now permanent (rendering the motor undriveable).
The faults are Engine System, Park Brake, HDC, Transmission and will not clear.
Fault codes are:
P0193-17
U2023-86 (pending)
U0416-86 (pending)
U0401-94 (pending)
U0402-94 (pending)
U0416-94 (pending)
U0421-94 (pending)
C1A00-88
U0128-87
U0401-68
We are on our third fuel pressure sensor!
Any thoughts much appreciated.
6th Jul 2024 2:04 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5093
You could have a severe fuel restriction on the low pressure side (lpfp) or, there may be a problem with either the VCV or PCV in the HPFP.
You could try disconnecting the FRPS and see if it will run, if it does it's possible the hpfp is at fault, but this could be as a result of poor supply pressure!
I would begin with replacing the fuel filter, then testing the fuel flow and current draw on the lpfp in the tank and replace if in any doubt. Even if you still had to replace the hpfp afterwards, it wouldn't be long before the lpfp would throw in the towel anyway!
The important thing here is the quality of the parts you use, so do not be tempted to cut costs using cheap inferior parts. The Britpart lpfp is good quality but it will come in cheaper than the LR original Walbro pump. I would strongly advise against a recon hpfp as very often the original PCV & VCV are not replaced, and these are usually where the fault lies. Unless the vendor can guarantee that new PCV & VCV's are fitted.
It's not a cheap part either way, but one thing is for sure if you have to do it you only want to be doing it once. yµ (idµ - eAµ) ψ=mψ
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