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Discussion Starter #1 (Edited)
Hi, I got some wierd problem with my E46 and i have a N42 in it an would like to put some better engine in it. It doesn't need to be more powerful but not less. I iam new to the bmw community, so i hoped someone could tell me what engines would fit in an 318i E46 2002 touring. Sorry for my bad writing.
 

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Hi, I got some wierd problem with my E46 and i have a N42 in it an would like to put some better engine in it. It doesn't need to be more powerful but not less. I iam new to the bmw community, so i hoped someone could tell me what engines would fit in an 318i E46 2002 touring. Sorry for my bad writing.
Hi, you don't say what the problem is with the N42. Tbh moving from a 4 pot to anything else is not that simple. If the engine is goosed then a second hand unit is probably the best option.
 

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The engine has problem starting if the engine is cold. I jump between 680rpm to 715rpm, it eats/ leak oil, not sure which. Get a lot of different engine codes. I can clear the code but if i do a street race/drag race start i will get a new code and they just go to pending but they are never the same one
 

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I am leaning towards vacuum leaks and blocked breathers and work gaskets. The intake boots spilt over time and as a result alow unmetered air into the intake,

https://www.realoem.com/bmw/enUS/showparts?id=AX52-EUR-05-2002-E46-BMW-318i&diagId=13_0949

this will throw up quite a few codes. Take the inlet boot off and inspect it for any splits or cracks that could let air in.
Check to see if the valve cover gasket is leaking,

https://www.realoem.com/bmw/enUS/showparts?id=AX52-EUR-05-2002-E46-BMW-318i&diagId=11_3179

it will be as the rubber gasket will have gone hard and brittle and will almost certainly be running dow the side of the engine.
Also, check the CCV system, if it's blocked or failed, you will get excess crank case pressure build up making the oil find the easiest way out to relieve the pressure.
Seeing as you will have the valve cover off, change the plugs at the same time.

https://www.realoem.com/bmw/enUS/showparts?id=AX52-EUR-05-2002-E46-BMW-318i&diagId=11_3180

Good luck.
 
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