- Re: seat ibiza 1.2 petrol 3cyl 2003 e/m light on running rich Archived Message
- Seat Ibiza 1.2 3cly 2003 - MIL on, manifold absolute pressure sensor implausible signal, rich # - john enticott April 18, 2007, 10:48 pm
- Re: seat ibiza 1.2 petrol 3cyl 2003 e/m light on running rich - Dave Harney April 18, 2007, 11:51 pm
- Re: seat ibiza 1.2 petrol 3cyl 2003 e/m light on running rich - Paul Killingsworth April 19, 2007, 12:15 am
- Re: seat ibiza 1.2 petrol 3cyl 2003 e/m light on running rich - Dave Harney April 18, 2007, 11:51 pm
Posted by Paul Killingsworth 
on April 19, 2007, 12:15 am, in reply to "seat ibiza 1.2 petrol 3cyl 2003 e/m light on running rich"
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Hi there i see you have a fuel trim of -27% this is the oxygen sensors ability to alter the Lambda control window which on VW group cars normally runs 5-10% either way if the reading were positive this would indicate an air leak however as yours is nearly on the full threshold of backing the fuel right of it would indicate map sensor at fault however i have had the ACF valves go faulty due to people overfilling there cars causing the Activated charcoal filter to become saturated this then clogs the valve causing the valve to still let HC through causing the high reading a leaking injector can do the same. Have you had the map sensor of and cleaned as these also clog up . PS if you go into measured value blocks of data ie live data then switch to basic settings in 99 group this will switch of the lambda probes so you can get a true reading of whats happening with a four gas as well Hope this helps Paul Ps max window for short term fuel trim is 30% on your car 
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