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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 05-07-2010, 02:58 PM   #1 (permalink)
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e46 320d - bad mpg, black smoke and rattling noise when accelerating

hey!
I know you guys aren't diesel drivers, but I'm asking anyway.
e46 320d 2002 saloon. when accelerating brutally in the second and third gears black smoke comes out. a lot. some will say that is normal for a diesel to smoke, but it is a lot of smoke. no error lights up, no problems on tester while running. cleaned the egr and found some improvement. little.
also in the second and third gears I get a rattling sound when underload and accelerating up through 2000rpm. changed the exhaust starting from the second cat and the muffler. no change.
and third. although the computer says 58 mpg on highway, when I do the maths using the fuel level sensor, it comes out that the consumption is around 40 mpg.
I'm thinking that the first and third problems are connected. not sure about the second one.
I would like to hear some opinions. thanks!
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Old 05-07-2010, 04:05 PM   #2 (permalink)
OMFG another one!?
 
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Not enough air for the amount of fuel, maybe an air filter or MAF sensor issue(s)?
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Old 05-08-2010, 12:06 AM   #3 (permalink)
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shouldn't be a MAF error on tester if it was that? I changed the air filter last week, and did see some results. but the smoke's still there.
about the rattle. I searched the forums and only one had a breakthrough. the one with the head gasket. the problem is that he had low pressure with some injectors. I don't.
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