I have a 2001 Peugeot 806 hdi 16 valve engine with a lowly 41k on the clock.
Just recently (last few months) the engine management light came on and the car would not rev past 3000rpm.
The car then began to cut out (last few weeks) when taking your foot off the throttle whilst driving.
You cannot re-start the car straight away as you have to wait for the ecu to turn on the fuel lift pump (the one that sits in the tank) which can take 30 secs once the car has cut out. You can hear a relay switch on the right handside of the engine bay and then the fuel lift pump comes on and the car starts.
This was also accompanied by the car continuing to run on for a few seconds after the ignition had been turned off.
I understand from various threads that this seems to be a common fault on hdi engines and is the ecu trying to purge what it thinks is excess fuel pressure before shutting off the engine.
On cold days I had also noted that upon turning off the engine there is some sort of fan that continues to run for a few minutes longer on the lefthandside of the engine bay. The engine seems to have some sort of secondary "exhaust underneath the bonnet - drivers side"? where you can often see exhaust fumes coming out once the engine is turned off.
Not sure if this has any bearing on the current cutting out fault?....or if this is a normal characteristic of this engine?
Up until now the car has not missed a beat and has been happily running on a mix of biodiesel / svo and diesel.
A mechanic friend suggested that I check the fuel filter for blockages. The filter was clean and in good condition, but to be sure this was replaced.
The bottom of filter housing was also checked for any metal fragments, which apparently is the tell tell signs of failure of the high pressure pump or fuel lift pump.
Again this was clean and no signs of wear.
I have dropped the fuel tank and taken out the fuel lift pump and inspected it.
The pump was cleaned, the tank inspected (no dirt/gelling bio/metal fragments) and drained and again all looked ok.
On reinstalling the fuel lift pump and tank, the car was now cutting out more frequently, only running for half a minute before dying. The car has been filled with Shell Diesel 100% no bio/svo mix to rule these out.
There is plenty of fuel getting into the filter housing, so for the time being am ruling out a possible faulty fuel lift pump.
On checking various forums and threads, this seems to be a common complaint with many hdi engines...with a number of possible causes.
All Previous faults on the ecu were cleared and the diagnostics run again.
On running a second diagnostic on the car, two faults were coming up:-
Glow plug relay
Fuel pressure sensor
The engine management light continues to stay on.
I'm not sure why the glow plug relay fault is appearing as the car always starts great even in really cold weather?
I have disconnected the fuel pressure sensor (the one that sits upside down on the common rail with the red three pin connector) and by doing so the car no longer cuts out. But is now running badly with the timing all over the place...this is to be expected as the ecu would be running default settings.
Interestingly with the fuel pressure sensor disconnected the car no longer continues to run on when the ignition is turned off. Also the exhaust fan that would run for a few minutes after the car is switched off - is also not coming on ( not sure if this is correct or not?)
If i reconnect the pressure sensor the car will cut out again....only after a few seconds.
My mechanic friend has suggested I take the car to a diesel specialist as there are a number of issues which could be causing the car to cut out:-
1. Possible faulty fuel lift pump (pumping but not strong enough to reach threshold pressure)....ruled out for now
2. Fuel pressure regulator sticking/jammed/blocked
3. Faulty pressure sensor - poor connections/ weeping internal o rings
4. High pressure pump failure - again this has been ruled out for now as the car does run when the pressure sensor is disconnected.
My mechanics view is that it is unlikely to be either of the pumps as the car would just not run (even with the pressure sensor disconnected?)
So I am leaning towards replacing the pressure sensor and see what happens next.
Can anyone shed some light on what is going on here?
This is beginning to spoil what has been a positive experience with this car.
I have really enjoyed the soft ride, internal space / sliding rear doors and quiet powerful engine.
But if I can't get to the bottom of the engine problem...then the car will have to go and make way for another.
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I appreciate this is an old thread, but my car has developed the same symptoms. I have a 2000 (x) 806 Quicksilver 110 hdi, I had it diagnostic checked and all the codes related to low fuel pressure. I was advised that it was the low pressure fuel pump (in the tank). I have changed this and the brown relay under the bonnet n/s. I had all the codes cleared and was running fine, until I was on the motorway doing a steady 70mph... when I took my foot off of the accelerator the engine cut out and the engine management light came on. I stopped and re-started the engine, the engine management stayed on but the car was driving fine until I took my foot off of the gas again. Also when I turned off the engine, it ran on for a second or two.......... Has anyone else had the same and found the answer please.... it is driving me mad.....
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Hi Bob I'm experiencing similar problems with my y reg quicksilver 806. I love this van for its versatility and comfort/drive but I've been hearing horror stories about these engines and these problems so not sure wether to cut losses and put it down to bad luck or start working out problem as my garage doesnt want to touch it and has advised it could be costly.
It started with the engine management light coming on and putting the car into limp mode.
I have now experienced some diesel leaking from what looked like the fuel filter, took it to the garage I usually use as it was too wet and cold to look myself on the side of the road and wasnt fussed taking the kids in a car leaking diesel...with age comes responsibility ;-)
Since having the filter and seals changed to stop the leak it now cuts out on me though will restart if you switch the ignition off wait a couple of seconds and restart it. Before having this done it just went into limp mode.
I have had the following codes:
P1521 clutch pedal switch signal. Consistency with vehicle speed. Permanent Fault
P1138 fuel pressure Regulation Fault. Intermittent Fault
P0191 Fuel Rail Pressure sensor 'A' Circuit Range/ Performance. Permanent Fault
P1112 Fuel Pressure - control. Permanent Fault
All the threads I have read seem to point to the low pressure pump in the tank just wondering if its worth the punt as the pump is £150 from what I can see. Any advice on things to rule out or first steps would be appreciated as I spend my spare time playing with carburettors and two strokes not this kind of stuff?
Cheers Tone
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Anyonw out there that could offer any opinions? or seen this before?
Cheers Tone
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