14-06-2020, 09:53 PM
The ECU you linked to (0 261 204 652) was used on the slightly later XU10J4R with 200cc injectors on the 306. I didn't know an MP5.1 ECU had been used with other models and don't therefore know if there were other differences apart from the injectors.
If anything I would have thought that the ECU you have working with older injectors would have meant less fuel was being delivered than the ECU expected. That's assuming both used same pulse times. Either way you should certainly get the correct injectors to match with that ECU. You'd need Bosch 0280155803 injectors. There's a cheap set here if they'll ship overseas. https://www.ebay.co.uk/itm/Peugeot-306-2...SwYmZXM2TR
If anything I would have thought that the ECU you have working with older injectors would have meant less fuel was being delivered than the ECU expected. That's assuming both used same pulse times. Either way you should certainly get the correct injectors to match with that ECU. You'd need Bosch 0280155803 injectors. There's a cheap set here if they'll ship overseas. https://www.ebay.co.uk/itm/Peugeot-306-2...SwYmZXM2TR