Hello. My congratulations on your purchase. What type of engine is installed? photo? Maybe m54b25 or m52b28tu... It's easier and cheaper to find the same motor so as not to change the wiring and the rest ... By the way, what about the old motor, it can not be repaired?

 

I believe somone one told me the motor is a m52b28tu unfortunately I don’t have a photo atm. And the old motor runs and drive but it don’t pass 3k rpm and the old owner said the car has rod knock it has a banging noise coming from the motor but there’s no metal shards in the oil and also the car likes to die randomly so i believe it’s not repairable in my opinion

 

Take a photo / video ... here you can insert a link from YouTube ... you need to find the cause of the malfunction ... it would be nice to show the car to a fanatic, run diagnostics, these devices are quite inexpensive ...

 

find the same motor used and i replace the following and then drop it in:

1. OIl pan gasket
2. Oil pickup tube O-ring
3. OIl dipstick O-ring
4. OFH gasket
5. Front/rear main
6. hard coolant pipes under manifold
7. All CCV & hoses
8. intake manifold gasket
9. DISA rebuild
10. TB gasket
11. 6x ccv distribution manifold o-rings
12. injector O-rings
13. Get a coolant pipe O-ring kit off ebay and change all the coolant O-rings on the hoses if they are in decent shape
14. valve cover gasket & gromets
15. water pump & new t-stat
16. intake boot if its torn or looking terrible
17. idler pulleys if they are making noise

Or you could gamble and just throw in the motor without doing anything and you will most likley end up doing that entire list slowly over time.

 

Jorge, you gotta do you, but nothing is more expensive than a cheap BMW, and a free BMW is probably the most expensive of them all..

I suggest you walk away and sell this project to somebody else.

In my opinion, it’s going to cost you $3,000 minimum to get this on the road in safe condition. And that assumes you do all the work, which will take you 3 weeks to a month working nights and weekends..

having said all that,

For the easiest plug and play replacement, you want an M52TUB28.. it came in 328i, 528i and Z3 2.8 from ’99-‘00…You can find an engine from LQK or Car-part.com, but if you get a warranty, read and follow every word. Buying a running parts car with engine is usually the cheapest option. And pulling the engine out of both cars might give the experience you need to install it.

 

Very few cars with blown engines are a "cheap" fix.