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Help! Rich Running Engine,

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#1 Jonathan W

Jonathan W


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  • Name: Jonathan
  • Ford Model: Focus MK1
  • Year: 1999
  • Location: Cambridgeshire

Posted 24 November 2011 - 11:36 AM

Iv been strugeling for a while now to work out why my ecu is running with a shift of 15-25% rich ( not measures this is the computers compensation amount ), iv logged dats rom the ecu, the maf readings are reasonable ( had it off, it looks like it was changed by the previous owner and is new and clean) and changes responsivly with speed and load, the O2 sensor ( of which there is only 1, 1998 mk1 focus) reads in a range of 0-1.2 and jumps around nicely, no damage to wiring. There is also excessive soot building up on spark plugs and the like ( brand new plugs, black very quickly ) but no black smoke from the exhaust yet.the MPG is steady but lower Than I would expect / want.

Anyone get any ideas?

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