Hi guys, I need a little direction on this one. My 2006 td4 loses power, starts ok, runs fine until I push for power then it loses power. No fault lights, scanning shows reduced high fuel pressure, if I stop the engine and restart it will run ok until I push for power. I've changed the high pressure sensor and checked the wiring to the ECU with a meter, all checked ok. If the sensor or wiring are faulty, will it always bring on the fault light?
Td4 fuel rail pressure problem
- Thread starter Rowbear
- Start date
This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
Nodge68
Well-Known Member
- Posts
- 32,504
- Location
- Near Newquay
As above. Codes are pretty worthless without live data to actually show what's going on.
You need to note live data when not faulty, and when the fault is happening, for comparison.
Get these parameters, both pre-fault, and when the fault is happening.
Boost pressure (MAP).
Low pressure fuel supply.
High pressure fuel supply.
Air mass measured (MAF).
Report back with those figures.
You need to note live data when not faulty, and when the fault is happening, for comparison.
Get these parameters, both pre-fault, and when the fault is happening.
Boost pressure (MAP).
Low pressure fuel supply.
High pressure fuel supply.
Air mass measured (MAF).
Report back with those figures.
Hi, it was live data, I'll do another scan tomorrow, when it happens the graphs drop on everything lol. I think the high pressure sensor/cabling LR recall has sent me off course. I did put another high pressure sensor in (an old one) the engine went super for 3 days.... then away again.
Many Thanks for advise. Ta
if they drop on everything that would lean towards the low pressure pump - lift the lid (from the back seat) listen and stick a voltmeter on, if there are fluctuations in noise and voltage would indicate a load/ struggle
or air mass - air filter ok? I have seen intake pipes collapsing under suction - not on a TD4.
or air mass - air filter ok? I have seen intake pipes collapsing under suction - not on a TD4.
Hi, I'll do a scan tomorrow and get back with my figures. As per other reply, I've been steered off course with the problem re sensor to ECU cabling.
Many thanks for your help, speak soon.
Just took it for a quick 20 min run, unfortunately no problem all went very well. Pushing hard on the hills etc. I shall carry the scanner with me, When the fault reappears I can grad the data.
Just curious about the LR fix re cables sensor/ECU, do they go disc or high resistance?
Hi Nodge68, please find attached trace data from my scanner. I would appreciate your opinion. History, I had travelled 1.5hrs to location without any problem, on my return home after about 15mins the car lost power, I keep engine running and connected scanner. After about 5mins I stopped the engine and restarted, all was back to normal and also scanned. No eng light, no fault code, the restart seems to reset something?
Thanks for any thoughts on this matter.
Cheers Rob
The first one (LHS) is running bad.
Nodge68
Well-Known Member
- Posts
- 32,504
- Location
- Near Newquay
I can't see anything in the graph to show an issue really. The LP rail is nice and stable.
The HP rail, MAP and MAF all respond to changing load conditions.
It's a bit of a mystery as to why it would loose power.
Maybe check things like CAS feedback, and check the rail sensor plug for corrosion.
The HP rail, MAP and MAF all respond to changing load conditions.
It's a bit of a mystery as to why it would loose power.
Maybe check things like CAS feedback, and check the rail sensor plug for corrosion.
Thanks for your thoughts, it's very random, were it to be regular I could record the change. When it runs bad there is reduced power, hills become difficult. The fact I don't have any eng light while it's running in some sort of limp mode and if I switch off and restart it goes fine.
Cheers
Rob
paul99
Well-Known Member
- Posts
- 352
- Location
- Right here, right now.
Brings to mind an old Datsun Cherry. There were rust flakes in the tank or the fuel line. Flakes used to get through and stop the fuel from getting into the filter and onto the engine. It could be something similar.
