Hello guys,
I have a 2008 1er e87 116i. Engine code: N43.
The car is losing fuel pressure under WOT, but only up to 3-3.5k rpms.
If I press the gas pedal gently up until 3-3.5k rpms, everything is fine. If I am below 3k rpms and press the gas pedal a little harder or in 'kick down' mode the car starts to struggle. It jitters for a while, it loses power and a strong hissing sounds from under the hood(I guess) appears. If I put the car in neutral in due time(like when the hissing sound starts) and wait a bit, everything comes back to normal. Well, most of the times, cuz there are times when the engine stalls. Also, when this happen, when the hissing sound and the jittering start, the car not only loses power, but there is a strong fuel smell getting inside the car, so I suspect a gas leak, I just can't figure where that might be.
I used INPA and ISTA+ to read live data of my fuel system.
At idle both LPFP and HPFP pressure appeared to be normal.
LPFP: around 5000 hPa(millibar)
HPFP: around 150.000 hPa(millibar)
Also the pressures hold if I'm in neutral, no matter how hard I press the gas pedal.
If the car is in gear(2nd to 6th) however, things are a little different if I go WOT.
LPFP: holds a steady pressure of around 5000 hPa (+/- 1-2%)
HPFP: holds the pressure for a while, there starts to drop under 100.000 hPa. The lower I managed to record was 68.000 hPa. But if this isn't happening the pressure increases up to 200.000 hPa, which is good.
If the car starts to act up and I continue to push it, the CEL comes on and the car starts to shake as if it was running with only 3 cylinders. Until I stop the engine. If I stop the engine, leave it for a few seconds and starts back up, everything comes back to normal. Until I go WOT again.
I also read the error codes almost everytime this happens and the codes I'm getting are as follow:
-2AAF - Fuel pump, plausibility. Integral component EFPPWM outside valid range. Fuel pressure before fuel-supply control valve: around 1500 mbar.
-29D0 - Combustion misfire, cylinder 4
-2A2D - Fuel low-pressure system, fuel pressure. Lower threshold 1 reached.
-29F1 - High pressure sensor faulty, sensor value too low. Rail pressure: 80.000 - 90.000 mbar (depending on the case, but definitely under 100.000)
-3104 - Rough running, stratified-charge mode. Which I don't know what it means.
The things with these errors is that:
-29D0 appear everytime the car acts up.
-3104 only happen from time to time
-and the other never appear simultaneously. It's either 2AAF and/or 2A2D(sometime there's only one of them, sometimes there are both) or 29F1.
The misfire is not happening because of spark plugs or coil packs because they are all new (around 1000 km) .
I already changed the Low pressure fuel sensor. And the Low pressure fuel pump is on the way, I'll change it as soon as it arrives, probably in a couple of days.
I had a guy at a service check my fuel pressure using a manometer a few days ago. For some reason he said he can only check my low pressure side and on the low pressure it was around 5700 mbar. I don't know if it's good or not. Seemed a little too high at the time.
Also, I've got my timing chain kit changed about 5-6k km ago. But that was more than a month ago and the car ran fine. So I think the timing chain can't be at fault here, can it?
I don't know, I'm losing my mind here. I don't know what the cause could be and I kinda don't wanna throw money at my car for nothing.
Do you guys have any idea on what might be the issue here?
Thank you in advance.
I have a 2008 1er e87 116i. Engine code: N43.
The car is losing fuel pressure under WOT, but only up to 3-3.5k rpms.
If I press the gas pedal gently up until 3-3.5k rpms, everything is fine. If I am below 3k rpms and press the gas pedal a little harder or in 'kick down' mode the car starts to struggle. It jitters for a while, it loses power and a strong hissing sounds from under the hood(I guess) appears. If I put the car in neutral in due time(like when the hissing sound starts) and wait a bit, everything comes back to normal. Well, most of the times, cuz there are times when the engine stalls. Also, when this happen, when the hissing sound and the jittering start, the car not only loses power, but there is a strong fuel smell getting inside the car, so I suspect a gas leak, I just can't figure where that might be.
I used INPA and ISTA+ to read live data of my fuel system.
At idle both LPFP and HPFP pressure appeared to be normal.
LPFP: around 5000 hPa(millibar)
HPFP: around 150.000 hPa(millibar)
Also the pressures hold if I'm in neutral, no matter how hard I press the gas pedal.
If the car is in gear(2nd to 6th) however, things are a little different if I go WOT.
LPFP: holds a steady pressure of around 5000 hPa (+/- 1-2%)
HPFP: holds the pressure for a while, there starts to drop under 100.000 hPa. The lower I managed to record was 68.000 hPa. But if this isn't happening the pressure increases up to 200.000 hPa, which is good.
If the car starts to act up and I continue to push it, the CEL comes on and the car starts to shake as if it was running with only 3 cylinders. Until I stop the engine. If I stop the engine, leave it for a few seconds and starts back up, everything comes back to normal. Until I go WOT again.
I also read the error codes almost everytime this happens and the codes I'm getting are as follow:
-2AAF - Fuel pump, plausibility. Integral component EFPPWM outside valid range. Fuel pressure before fuel-supply control valve: around 1500 mbar.
-29D0 - Combustion misfire, cylinder 4
-2A2D - Fuel low-pressure system, fuel pressure. Lower threshold 1 reached.
-29F1 - High pressure sensor faulty, sensor value too low. Rail pressure: 80.000 - 90.000 mbar (depending on the case, but definitely under 100.000)
-3104 - Rough running, stratified-charge mode. Which I don't know what it means.
The things with these errors is that:
-29D0 appear everytime the car acts up.
-3104 only happen from time to time
-and the other never appear simultaneously. It's either 2AAF and/or 2A2D(sometime there's only one of them, sometimes there are both) or 29F1.
The misfire is not happening because of spark plugs or coil packs because they are all new (around 1000 km) .
I already changed the Low pressure fuel sensor. And the Low pressure fuel pump is on the way, I'll change it as soon as it arrives, probably in a couple of days.
I had a guy at a service check my fuel pressure using a manometer a few days ago. For some reason he said he can only check my low pressure side and on the low pressure it was around 5700 mbar. I don't know if it's good or not. Seemed a little too high at the time.
Also, I've got my timing chain kit changed about 5-6k km ago. But that was more than a month ago and the car ran fine. So I think the timing chain can't be at fault here, can it?
I don't know, I'm losing my mind here. I don't know what the cause could be and I kinda don't wanna throw money at my car for nothing.
Do you guys have any idea on what might be the issue here?
Thank you in advance.