SOURCE: 1998 BMW 328i Drivers Seat Problem
gears are probably not engaged. take the seat out, see if the motor drive gear is still within the teeth of the seat rail. if not, force it in. Easy to take out, 4 bolts and the seat comes up and out.
SOURCE: 1996 328i bmw sometimes loses power and won't pass smog test
Ok you will have to have it scanned. It probably has cylinder misfire codes and random cylnder misfires. You could need spark plugs and or coils. The scan will tell you exactly which cylinder is missing. That will cure your problem and remember to change your oil and filter right before you go in for the smog test. Also if the car hasn't been serviced in a while it would be a good idea to replace the air filter and fuel filter.
SOURCE: Drivers seat stuck in recline BMW 328i
Take the seat out and turn it over, to see if the gears are stripped, or if something simply became unattached.
It is needs expensive parts, consider a junk yard, or if really desperate, steal them from the passenger seat. Worst case, just lock it into one position that is best for you.
SOURCE: I own a 1996 328i BMW, and the drivers automatic
Very common problem. The white plastic gear in the tilt mechanism gets old and brittle and breaks.
BMW will want to sell you a whole gear box with motor. Aside from the outrageous cost, removing that gearbox is a pain.
Odometergears.com will sell you just the plastic gear for $40, and their website has wonderful instructions that show you how to replace it quickly and easily.
You will have to remove the seat from the car. Put some old socks over the tips of the seat rails that unbolt from the floor because the seat is rather heavy and awkward to handle, and the tips of those seat rails are very sharp and will cut up the interior and exterior of your car if they touch anything as you wrestle with the seat DAMHIK.
The other tip is to be careful not to over-tighten the screws that hold the cover on the gear box, They are not very strong and will twist in two easily. Again.. Don't ask...
Unrelated, but if the leather on your driver seat is shot, you can use the leather from a junk yard passenger seat to freshen up your driver seat. The seat bottom is replaced foam and all. Don't bother trying to save the plastic snaps, just pry the seat bottom up and put in new snaps. The leather on the seat back has to be removed from the seat and transferred, but it is not difficult.
SOURCE: how to change backrest seat gear that is inside
Go to the Odometergears.com website. They sell the plastic gear for $40 and they post excellent instructions for how to replace it.
You need to remove the seat from the car. It is rather heavy and awkward. Put old socks over the ends of the seat rails that bolt to the floor because the tips of those rails are razor sharp and will cut your interior, your exterior, and you if you don't cover them
Be careful not to over-tighten the screws that hold the cover on the gearbox. Those screws are not very strong so they are easy to twist off.
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