Cold Weather Start Issues

I have a 2002 BMW 325ci Convertible with around 110k miles on it and I realized that the car would sometimes not start up on a cold day roughly around (35 degrees or less) apparently I'm not the only one with this issue and I read that there isn't a true fix to it is that true? Some say they warmed up their ECU before they started their car and said it worked fine, other say it didn't work for them and then people/dealers would say that it's a filter problem, fuel tank, etc. But then when those get replaced and lots of money are gone, it still wouldn't start. I'm afraid to buy a part that isn't necessary especially since I'm on a low budget and must be careful on what I purchase. But I'm in desperate need to fix the problem especially since I always go in to school in the cold AM (Sometimes it would start if I keep trying to start it after a couple of times, but sometimes it won't start at all until it gets warmer). I was wondering if there was anybody who has the same problem but got it permanently fixed. Thanks for the heads up and I look forward to the your answers. So sad on such a beautiful car....

How old is your battery?

An anecdote that may not apply: I once had a motorcycle that I parked out doors where I had a cold start problem. Turned over great but wouldn't catch if the temp was below 40F or so. Solution ended up being the battery; it seems it was good enough to spin the motor but in doing so the voltage dropped below whatever threshhold was necessary to drive the ignition circuit.

The way I figured it out was by pulling the battery and keeping it indoors overnight. Warm, the battery was good enough to start the bike. While doing this with a car battery might be a bit more than you want to try, perhaps if you had a trickle charger you could use that and it might keep the battery a little warmer from the charging.

Just a random thought, maybe it'll help.

I don't know how the old battery is actually....Thanks for the quick head ups I'll see if the battery will be the solution to my problem.

Is your service engine light on? It would really help to get some error codes that might lead in the right direction.

No lights are on the dash.

Originally Posted by MisterGalliano

I'll see if the battery will be the solution to my problem.

This should help with testing the battery:
- DIY how to test a BMW battery & alternator

Definitely sounds like a new battery is in order, get an oem bmw not autozone duralast