I find this interesting. I was called out to a garage today with a Punto with exactly the same problem plus poor starting. OK, it was a 2007 Punto 1.2 8v (not the Grande variant). Having remembered this post (thanks Carl) I was obviously forearmed and noted that the garage had already changed the Coolant Temp Sensor. No fault codes were present but the Air Temp Sensor (ATS) indicated 45c which patently was incorrect. Now this vehicle has a separate Air Temp Sensor and not incorporated within the MAP. This for some reason is at variance with my Autodata disc. By disconnecting the ATS the vehicle started immediately and ran perfectly.
The reason I found this interesting was because I always perceived the ATS as a minor sensor which only slightly trimmed the fuelling I wonder why for this vehicle it now has great significance on the cold start and running of the vehicle? If it had not been for Carl's post, I would have been scratching my head as I would have ignored the ATS reading as inconsequential.
Regards
Pete M
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