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21 Posts
Hi there got a 2001 e46 330d 181hp that won't rev past 3000rpm.
It feels like as if it's hitting a limmiter, and pours out black smoke when you try to go past it. It sometimes dose go past and you get a bit of power around 4200rpm then. If you try to go past and pop the clutch in it idles rough and misses a bit for a bit then returns to normal. Can drive it upto around a max of 2500rpm fine.
I've read the codes and got 4704 'pre - supply pressure monitioring' reduction due to low pre supply pressure.
So I proceed to try anther in tank fuel pump, and under bonnet fuel filter - no difference.
So then I took the inlet manifold off and cleaned out some of the carbon, not much bit a bit was present. Checked all vacumme lines and found no obious cracks or splits. The map senor was a little bit gunked up with like a wet oily substance so cleaned it off with some electrial cleaner. This made no difference.
So then I tried unplugging sensors.
First I unplugged the MAF and went for a spin - no real difference
I plugged the MAF back in and then tried unplugging the pressure sensor on the fuel filter and again no difference.
Plugged this back in and then tried unplugging the MAP sensor - with this unplugged the car had no issues revving right up to the limmiter. Full power past 3000rpm but below that seems down on power. I have left this unplugged no and has been running OK.
Checked in pa fuel pressures and low pressure seem's to be a stable 4bar.
Not sure what it could be don't particularly want to be buying sensors when they're OK. Are there any other tests I can do to narrow it down ?
Cheer's Cutis .
It feels like as if it's hitting a limmiter, and pours out black smoke when you try to go past it. It sometimes dose go past and you get a bit of power around 4200rpm then. If you try to go past and pop the clutch in it idles rough and misses a bit for a bit then returns to normal. Can drive it upto around a max of 2500rpm fine.
I've read the codes and got 4704 'pre - supply pressure monitioring' reduction due to low pre supply pressure.
So I proceed to try anther in tank fuel pump, and under bonnet fuel filter - no difference.
So then I took the inlet manifold off and cleaned out some of the carbon, not much bit a bit was present. Checked all vacumme lines and found no obious cracks or splits. The map senor was a little bit gunked up with like a wet oily substance so cleaned it off with some electrial cleaner. This made no difference.
So then I tried unplugging sensors.
First I unplugged the MAF and went for a spin - no real difference
I plugged the MAF back in and then tried unplugging the pressure sensor on the fuel filter and again no difference.
Plugged this back in and then tried unplugging the MAP sensor - with this unplugged the car had no issues revving right up to the limmiter. Full power past 3000rpm but below that seems down on power. I have left this unplugged no and has been running OK.
Checked in pa fuel pressures and low pressure seem's to be a stable 4bar.
Not sure what it could be don't particularly want to be buying sensors when they're OK. Are there any other tests I can do to narrow it down ?
Cheer's Cutis .