I now have a 2007 207 1.6HDI sport 90hp, after changing the egr valve and boost pressure solenoid I fitted a boost gauge, under acceleration the boost pressure fluctuates from 20 psi at full throttle to nothing(like I come off the throttle for half a second) it does this under any boost. Has...

Right, I have done some reading before I posted, and am still scratching my head. Car is a 1.6 HDi 2007. I keep getting an intermittent Temperature Warning on the dashboard but it only happens under load. There is a bleep, the warning flash and often the power cuts out - All for a split second...