Hi guys!
Hippo needs rescue. Please help!
Freelander 2004, TD4, manual. 93k.
I keep getting the same code P1090- Fuel Rail Pressure Plausibility. I update something, clear the code, but so far it keeps coming back when I take hippo for a ride.
When engine is cold, car takes a few extra cranks to start than normal (before fault). Also, I see blue smoke when I start. Once started it runs rough for a couple of minutes, but then it settles.
Idle is fine all the time after that. Even after I get the code and starts limping, if I take engine out of gear and let it idle, it idles just fine forever.
Problem occurs usually a few minutes after I start driving and after I change gears (usually downshift). As I release clutch and accelerate, hippo hiccups.
This fault is exaggerated if for example I downshift from third to second, I start accelerating, reach 3000RMP and ready to shift back to third, but then I see something in front of me and I need to slow down a bit, so I release the throttle (RPMs go back to 2k) and then if I want to accelerate again, most times it starts hiccupping. Blue smoke appears sometimes. This is a classic scenario. Hiccups are in the range 1.8kRPM - 3kRPM. If I continue driving it ends in a cut off/breakdown. When I restart engine, MIL disappears, for a while, then re-appears when a similar scenario occurs. I can avoid hiccups if I manage to get it over 3kREVs. If I need to slow down, and I go back to 2k REVs range, it starts limping.
What I realised is that the fault is connected with the engine brake. What I mean is, if I accelerate to 3 k revs and then I suddenly take my foot of the pedal, engine slows down chaotically. Sometimes it goes smooth and gradual, sometimes it chokes and limps down. So, just as in the example above, if I am in second gear at 3k revs and release the throttle (suddenly or not), engine naturally enters the "engine brake" mode. My car seems to struggle with it and amplifies the problem.
On 5th gear I can't go over 3k REVS/ 70MPH unless downhill.
One day I managed to trigger the code stationary (video below), simply by playing with the throttle. Ups and downs, smooth or sharp accelerations. Fault seems to be connected with the throttle response. Sometimes I press the throttle and engine doesn't seem to respond accordingly. It feels as if it doesn't register the intensity of my "throttle pressing", or it does it randomly. I can get the engine to 4k Revs at random "pressing the throttle intensities".
The hippo has a new fuel filter, the EGR is blanked, a BMW cyclone breather, a new vent filter, air filter clean and I recently cleaned inlet manifold and most sensors and wires.
I back-probed the fuel rail sensor and I get a 5v in and 0.5V return in ignition mode. I also cleaned it. I believe it has been replaced already as it has a green connector.
I did injector leak off test. They are fine. All leak the same and very little.
Fuel pressure regulator valve readings seem a bit random though according to diagnostics. Same goes for the throttle readings.
I haven't cleaned the MAF yet, just the connections.
Luckily I have diagnostics and I take live readings. I believe for someone who is familiar with diesel, this should be an obvious problem.
I uploaded a bunch of videos, various tests. I caught one cut off while driving. I hope somebody here can interpret the data.
Any help is welcome. I've been investigating this for some time and I could use some support.
Many thanks.
Hippo needs rescue. Please help!
Freelander 2004, TD4, manual. 93k.
I keep getting the same code P1090- Fuel Rail Pressure Plausibility. I update something, clear the code, but so far it keeps coming back when I take hippo for a ride.
When engine is cold, car takes a few extra cranks to start than normal (before fault). Also, I see blue smoke when I start. Once started it runs rough for a couple of minutes, but then it settles.
Idle is fine all the time after that. Even after I get the code and starts limping, if I take engine out of gear and let it idle, it idles just fine forever.
Problem occurs usually a few minutes after I start driving and after I change gears (usually downshift). As I release clutch and accelerate, hippo hiccups.
This fault is exaggerated if for example I downshift from third to second, I start accelerating, reach 3000RMP and ready to shift back to third, but then I see something in front of me and I need to slow down a bit, so I release the throttle (RPMs go back to 2k) and then if I want to accelerate again, most times it starts hiccupping. Blue smoke appears sometimes. This is a classic scenario. Hiccups are in the range 1.8kRPM - 3kRPM. If I continue driving it ends in a cut off/breakdown. When I restart engine, MIL disappears, for a while, then re-appears when a similar scenario occurs. I can avoid hiccups if I manage to get it over 3kREVs. If I need to slow down, and I go back to 2k REVs range, it starts limping.What I realised is that the fault is connected with the engine brake. What I mean is, if I accelerate to 3 k revs and then I suddenly take my foot of the pedal, engine slows down chaotically. Sometimes it goes smooth and gradual, sometimes it chokes and limps down. So, just as in the example above, if I am in second gear at 3k revs and release the throttle (suddenly or not), engine naturally enters the "engine brake" mode. My car seems to struggle with it and amplifies the problem.
On 5th gear I can't go over 3k REVS/ 70MPH unless downhill.
One day I managed to trigger the code stationary (video below), simply by playing with the throttle. Ups and downs, smooth or sharp accelerations. Fault seems to be connected with the throttle response. Sometimes I press the throttle and engine doesn't seem to respond accordingly. It feels as if it doesn't register the intensity of my "throttle pressing", or it does it randomly. I can get the engine to 4k Revs at random "pressing the throttle intensities".
The hippo has a new fuel filter, the EGR is blanked, a BMW cyclone breather, a new vent filter, air filter clean and I recently cleaned inlet manifold and most sensors and wires.
I back-probed the fuel rail sensor and I get a 5v in and 0.5V return in ignition mode. I also cleaned it. I believe it has been replaced already as it has a green connector.
I did injector leak off test. They are fine. All leak the same and very little.
Fuel pressure regulator valve readings seem a bit random though according to diagnostics. Same goes for the throttle readings.
I haven't cleaned the MAF yet, just the connections.
Luckily I have diagnostics and I take live readings. I believe for someone who is familiar with diesel, this should be an obvious problem.
I uploaded a bunch of videos, various tests. I caught one cut off while driving. I hope somebody here can interpret the data.
Any help is welcome
. I've been investigating this for some time and I could use some support.Many thanks.
