Rough when cold [Archive] - Bimmerfest - BMW Forums

: Rough when cold

11-27-2008, 07:03 AM
Ok guys I'm new here and have a rough runner when cold.
I have a 1990 bmw 525i that every morning when I start it it idles fine but no matter what the outside temp is, if I start driving before the temp gauge is out of the blue the vehicle seems to surge and sputter until the gauge leave the blue cold area. Any ideas I generally get 19.1 mpg but since this has started it has dropped to 18.2. A friend of mine thought an injection temp sensor. Can anyone offer any thoughts?