Originally Posted by
hogdog
This conversion has been done before loads of times using the 1.8 ECU and injectors. They are virtually identical engines except for the capacity, only the fuelling needs adjusting.
The MAF sensor is perfectly capable of recognising the increased air flow and telling the ECU to compensate for it, it will then increase the fuel flow. At the moment it's recognising an increased air flow and compensating by increasing the fuel...The trouble is that it's working on the basis of 1.8 injectors when it has 2.0 injectors fitted...It's running rich, trust me on this, I've seen this problem before.
BTW, this might not be the only problem but it is a problem. With all else being well your car will run perfectly on 1.8 injectors.
This does not sound right to me, it makes sense what your saying re the injectors but it doesn't sound right you should run a 2L engine on 1800 injectors, I am sure if Ford could have saved money by doing this then they would have done so!
It also makes sense whats being said about the mapping, the ECU is not that smart to just increase the fueling when there is extra airflow, well it does but only by a slight amount.
As with any computer it can only do what it's been told to do, so if anything changes drastically it will need remapping, it may well work but it doesn't mean it's working properly.
Martin