I just replaced the rearmost rocker cover gasket and the oil (one of those under the inlet manifold). In addition I replaced the vacuum hose from the vapour reclaim solenoid to the throttle body. After assembling it again it starts fine, and it runs as it is supposed to on the ICV, starting with "high idle" when cold, and ramping down to cold idle over a few minutes.
However, the very instant I touch the throttle it dies. If I let go I can get it to recover, which it does as quickly as it dies. There's a hiss when running on the ICV which matches a friend's 210hp V6 (presumably vacuum - not a leak). As soon as I touch the throttle it stops hissing for as long as the car is "dying".
PP2000 reveals no fault, *however* the engine ECU does not reply. The ECU did not reply before either (replied only sometimes 2 years ago), so I suspect the diagnostic wire is busted. I've tried with a PP2000 clone and a generic peugeot-compatible tester. The car had no running issues before.
My interpretation is that is shuts off the ICV as soon as the throttle position sensor says I'm doing something - but why? Is there a sensor I can have forgotten to connect somewhere silly?
190hp V6, D9
3.0 V6 dies when touching throttle
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