| Simply replacing the chip is not enough. The new chip will have different fuelling characteristics to the old one and although these will "alter" the fuelling, the mixture could go either way depending upon the other parameters involved. Throttle balance, air bypass settings, mixture trim etc.
The only way to do it properly is to start from scratch with the TPS setting, work through it and finish off with the CO meter.
If the cans were fitted and the eprom simply "replaced" it will be all over the place. If this was the case, fitting the original one will probably improve things.
JHP's eproms are noticeably better "balanced", between the two cylinders, before setting up which if nothing else identifies the changes that an eprom causes when swapped. |