Very possibly an intake leak. Check all the large intake bellows for cracks, the attached hoses and connections are ok, and of course make sure the intake filter is clean and clear.
SOURCE: 1999 bmw 323i dashboard reads S and car wont turn over
check for power on the small wire on the starter with the key in the start position, if you have power, replace the starter
SOURCE: My bmw 323i backfired after cleaning the throttle
sounds like you an idle arecontrol valve to me, wich by the way is the only thing that really needs cleaned, make sure the air boot is not torn on the smaller part going to that vlv it tears at the bend you will need a mirror to see if in the car still, also check the plug on the same vlv make sure it is plugged in all the way, also also check the connector on the throttle itself the white arrows must be aligned and touching let me know what you find
SOURCE: hey my 2000 mk4 golf gti 2.0 petrol starts but
CHECK VACUM SYSTEM IF OK THEN THEN CHECK cpu AND ALSO FUEL PUMP SYSTEM
SOURCE: BMW 323i Fan Belt
u find the tensional roller n remove the cap. inside it has the nut commonly 16mm. rotate the nut clockwise and u ll see the belt wold be untension.
hold the nut n remove the belt.tq
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