Runs too rich

[jeffw]

My car is only getting 12 mpg it's pathetic? And if I run the rpms over 4 grand it spits a big black cloud. Any ideas?

[FetusGoulash]

coolant temp sensor maybe? It may be causing the computer to think it needs the cold start injection on all the time

[e30trooper]

im getting shit mpg too, lets just say the cold start is working becuase teh coolant temp. can i just unplug it ? One more thing wheres the coolant temp sensor at on the m10? im pretty sure mines crap. my temp gage is on about 1/2 the time. Allday yesterday when i was testing didint know the temp

[FetusGoulash]

there is a coolant temp sensor and a thermo time switch at the front of the head. they are both 2 prong sensors. the thermo time switch is the larger brown one which controls cold start injection (not cheap to replace). pick up a bentley it will tell you how to test them.
#4 is thermo time switch
#6 coolant temp sensor
#8 temp sender (tells the gauge how hot the coolant is)

http://www.realoem.com/bmw/showparts.do?model=1374&mospid=47315&btnr=11_0683&hg=11&fg=35