black smoke, poor fuel economy
#1
black smoke, poor fuel economy
Ok people here goes...I have an 89 740 16 valve...98k on it...I am having a bad problem with black smoke and poor fuel economy. The guys at the dealership checked it for everything so they said...I have replaced the ICM, ECM, AMM, checked for vaccum leaks, they cleaned the throttle body I think, andmade all the correct adjustments to the fuel system. The check engine light is NOT on, the car runs great, idles smoothly and doesn't miss. I just hate to get 8 MPG and have black smoke pouring out of the thing all of the time. Help please...[sm=boohoo.gif]
#2
RE: black smoke, poor fuel economy
I had the same problem with my 8 valve engine and it turned out to be a leaking fuel pressure regulator. I'm not familiar with the 16 valve engines but you should still have one of those. I would check the fuel pressure regulator and the O2 sensor if everything else has been replaced. Have you tried to check the codes yourself? You should have one referring to "lean out of limit". My check engine light didn't come onwhen I had my rich running problem too.
Dale
Dale
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12-04-2008 03:24 PM