I have been trying to figure this out for months, even the mechanic is having a hard time. I have a 84 325 e about a quarter of the way during warm up it wants to stumble and die. If I put my foot into it seems like it loads up. Runs fine cold and hot, but at that certain temp don't even try and start it cause it will be like it's flooded until it overcomes that temp point. Soon as it hits that mid temp at warm up it coughs and sputters. Hoping to find answers smog is due soon.

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW E30 Coolant Temp Sensor Replacement

Two things come to mind - a rubber hose that is expanding and allowing a vacuum leak to occur (and then seals up as it gets hotter), and a temperature sensors that has a "bad spot" in the middle.

- Wayne