Rough idle cold start CEL on 325XI
Hey all. Just bought a 03 325xi a couple weeks ago and its been great. so far i've replaced all spark plugs NGK OEM, OEM fuel pump and fuel filter, and changed the oil and oil level sensor.
Ive been having a problem sometimes when its cold out and trying to start the car. It starts fine but idles rough and CEL is on. I try to accelerate and it seems like it feels like it runs of 4-5 cylinders. as soon as i get it to operating temp, and shut the car off and turn it back on CEL is gone and idle is fine and smooth.
what could be the problem? i did notice that i have bosch coil packs on 1-2 and 5-6 and bremi on 3-4. should i replace the bremi's? Please let me know guys! thanks.