I have 320i - 2003 model , Engine E46. The problem is that the car has no good power when you accelerate plus it smokes heavily when you press accelerator or high rave. Car travelled Kilometers is 59,000. What is worrying most is the heavy smoking at the exhaust. What could be the problem?

What colour is the smoke? The easiest way to check this is on first start when the engine is cold. This can give clues as to where the problem could be. is the vehicle doing anything else different?
A blue exhaust smoke is commonly oil getting into the cylinders. White smoke suggests coolant getting into the cylinders. Black smoke is the engine running too rich. Blue or white smoke can often mean a blown head gasket. On a 2001 engine that could the most likely reason.

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Check the fuses.

BMW 3 Series E46 Fuses and Relay Diagrams

bmwguide.net https://bmwguide.net > 3 Series > E46

Jan 17, 2023 - The main fuse box is located in the glove compartment. You will see two white latches (left and right) that need to be turned to open the fuse ...

Fuse and relay box diagram BMW 3 E46

fusesdiagram.com https://fusesdiagram.com > BMW

Fuse box diagram BMW 3 E46 ; 6. Reversing lamp/s relay ; F1. (30A) Ignition coils-320i with MS43/325i/330i ; F2. (30A) Engine control module (ECM), reversing lamp/ ...

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https://www.google.com/search?q=bmw+325ci+vs+bmw+325i

325i

Fuse Box Diagram BMW 3-Series (E46; 1998-2006)

https://fuse-box.info > bmw > bmw-3-series-e46-1998-...
Here you will find fuse box diagrams of BMW 3-Series 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 and 2006 (316i, 318i, 318d, 320i, 320d, 323i, 325i, 328i, ..

Ci, Cabriolet

1998-2006 BMW 3 (E46) Fuse Box Diagram

https://www.e46fanatics.com > ... > E46 > E46 General
Oct 29, 2018 - Mine still has the card that identifies all the fuses but that is a good reference if yours is missing. 2002 BMW 325Ci Cabriolet Automatic, 140K ...

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do a compression test and see what compression you have to check to see if its piston rings or valves.or valve seals, it's more likely to be the valve seals as they are prone to fail over time. video on changing valve stem seals https://www.youtube.com/watch?v=pM9KXEw_Wd8. also check these as well as they are prone to leak as well
Rocker cover gasket
Ol filter housing
CCV pipe
You have to remove the aluminium support tracy at the bottom of the engine so you can see where its coming from.

Check steering oil

if its black smoke then its a fuel problem too much fuel the car can`t burn it . could be fuel injector over fueling. if its white smoke then its burning coolant, there is a head gasket problem that is damaged in the cyl #3 area. it could also be a bad valve guide/valve seal, oil rings, compression rings. you don`t say what colour the smoke is.

Use a good synthetic oil 5W30 or 5W40 or 0W40. I think you have to use the bmw long life oil rating.

More detail needed. Is the clutch dragging causing the engine to stall?
Does it otherwise idle OK?
Any fault codes?

What about the fuel pump?

hi try this site
www.realoem.co.uk
you will find everything on there you will need for your BMW...hope this helps