Hi,
Could anyone tell me where the boost pressure sensor is on a 2 litre Vectra Ecotec diesel turbo engine please. There is a sensor at the right hand end of the upper manifold which pushes into a hole of about
3/8 inch diameter but I can't tell whether that is temperature or pressure sensing. It has a flat 3 pin connector but no diaphragm-like flexible component. I do not know what it should look like.I am suspicious that the waste-gate valve is opening later (or not at all) than before and perhaps the turbo revs and manifold pressure are too high. The sound of the turbo seems much higher pitched at some conditions than others - especially when hot.
Is there a take off point on the inlet system to which I could attach a small bore pipe to a pressure guage so that I could monitor the boost pressure while driving on a temporary basis for a few miles. I believe it is supposed to be 1 bar on the DTH high pressure turbo version (that's the one with the intercooler).
I am sure someone out there must have worked on them. If the pressure remains clipped at 1 bar, I could forget the whole issue, But if not I could look for trouble at the solenoid. The vacuum pull off actuator seems to be working O.K. I can suck that open. It might also be the pressure sensor wherever that is. No ECU light has been coming on or anything.
As usual your experienced comments regarding the Vectra are welcome and due respect to those kind enough to advise.
Tony.