[N54_e90]

i have a 2011 323i and as of last week since the weather started to get a bit a cold my car has been doing weird stuff on startup. the rpms start jumping up and down as if the car is struggling to idle.

today was really bad as it dropped to around 400 rpms and the car felt like it was about to die, then it bounced up to 1500rpms and did this back and forth for a good 20 seconds. everything is smooth after it warms up.

i read about leaky injectors and what not but i only have 70,000 km on the car? i also have a very tiny vc gasket leak but its just residue, very minimal. so i don't think thats it.

just looking for any thoughts or possible insight here, thx

[Dan Bilzerian]

Any codes being thrown?

[N54_e90]

no codes

[N54_e90]

i just got in and i got a bulb malfunction light.. i was looking at videos on yt and people with this issue also seemed to get this light? not sure how its connected tho

[6ixSpd]

A weak battery perhaps?

[N54_e90]

i got a new battery over the summer, dont think that would be it

EDIT: maybe the connections could have come loose or something? i'll def take a look

[GoRomeo]

I would do 2 things...

1. Throw in a bottle of injector cleaner see if this helps...

2. Do a load test. Remove battery and take it to your local auto part store. They should do this for free? Have you ever replaced the battery?

[N54_e90]

Originally Posted by GoRomeo

I would do 2 things...

1. Throw in a bottle of injector cleaner see if this helps...

2. Do a load test. Remove battery and take it to your local auto part store. They should do this for free? Have you ever replaced the battery?

i have some chevron fuel cleaner on the way, definitely will try that. Also I had the battery replaced just a few months back actually.

[GoRomeo]

Originally Posted by crazythedon

i have some chevron fuel cleaner on the way, definitely will try that. Also I had the battery replaced just a few months back actually.

Make sure its the Fuel injector cleaner though... I fixed mine with a bottle of Chevron a while back when I had the same issue as you...

keep us posted.

[N54_e90]

Originally Posted by GoRomeo

Make sure its the Fuel injector cleaner though... I fixed mine with a bottle of Chevron a while back when I had the same issue as you...

keep us posted.

this is the stuff i grabbed: https://www.amazon.ca/dp/B000CCOL3I/...800_TE_3p_dp_1

is it the same or is there another product I should buy? i bought the 12 ounce, is that enough? do i just dump the whole thing?

also going to try to clean the maf sensor with some sensorkleen to see if that helps

[N54_e90]

i tried cleaning the maf but no luck, gonna double check i have no vacuum leaks anywhere but i doubt thats it.. pretty sure it is the injector as this is only happening on cold start. idles and drives perfectly once warmed up (assuming after it burned all the excess fuel in the cylinder)

here is a video of it. going to try to run the fuel cleaner today and see if it does anything if not off to the mechanic i go.. ill keep this updated with the solution in case anyone has the same issue

[Needbmwpartzz]

Sounds like battery,charge and report back!

[GoRomeo]

Originally Posted by crazythedon

this is the stuff i grabbed: https://www.amazon.ca/dp/B000CCOL3I/...800_TE_3p_dp_1

is it the same or is there another product I should buy? i bought the 12 ounce, is that enough? do i just dump the whole thing?

also going to try to clean the maf sensor with some sensorkleen to see if that helps

mmhh no Its more like this...

https://www.walmart.com/ip/Chevron-T...&wl13=&veh=sem