i have 52000km so about 33k miles. Throttle bodies appear fine but i have never removed them from the manifold collector tk inspect the dirty side. I have bypassed the coolant lines completely so they do feel stone cold after a good run - would that cause an issue? Definitely no subzero temps here though so i doubt ice formation.
i have a Scanguage II in my car so i can watch some parameters live. When i am experiencing the issue, throttle position (TPS) gets pegged at 25 degrees max. Even with my foot to the floor.
What do you guys think about the MAP sensor theory? if the throttle plate opens no more than 25deg under full load then there would be a lot of vacuum right? I'm not sure how vacuum for brake booster is managed on our engine but my guess is that under certain conditions, the throttle flap closes slightly to generate vacuum - thus avoiding the need for a separate vac pump
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