Greetings,

I'm working on a light naturally aspirated setup on my own Citroën C4 hatchback, 2 litter petrol engine EW10A (140 hp), and I have mounted a larger throttle body from the Peugeot 206 GTI180/RC engine EW10J4S (177 hp).

Everything is OK on the installation, I have checked the manifold and even replaced the larger throttlebody, also checked and replaced MAP sensor (both engines use the same sensor model), but I randomly get the annoying DTC P1160 error, which in my case seems to be tied to an incoherent vacuum reading by MAP sensor on manifold.

If I remove the bigger throttlebody and put back the smaller stock one, everything works just fine and the error is gone, therefore I believe that my ECU estimates something like a maximum air flow plausibility map based on its readings of manifold vacuum and throttlebody plate angle, but I cannot locate it on ECU file, nor find its Damos file - it's a Marelli IAW 6KPB.

Thank you for any hints.

Sorry for double post, or if this is not the right place at all, but I just wanted to add some pictures of my project. :D

The C4's EW10A engine mounted with a Peugeot 306 GTI-6 gearbox (BE4 bellhousing conversion):



EW10J4S big throttle body vs EW10A default throttle body:


Any help is really appreciated, as there is very little information available about the IAW 6KPB. If I can help you back somehow, I'll gladly do it.