My first posting here, I have a 51 plate Envoy van, dti 1.7 and she came to me with a number of things that need sorting, but I do enjoy a bit of spanner work
Primary problem is that the car has no power below 3.2k, and I mean nothing, once she is up there she will pull but below something is obviously wrong. I get a bit of black smoke at lower revs on the motorway and if I don't change up then I will get the yellow spanner on the dash (overfuelling - safe mode?).
I suspect that it is a wastegate issue as the turbo will develop pressure at high revs (when the wastegate would be open anyway)
I stripped the undertray off today and had a good poke around. The vacuum pump is healthy, and I can't suck any air out of of any of the sealed pipes, although this doesn't mean to say they may not be blocked...
I have a specific question about the wastegate operation on these cars;
- Is the wastegate held shut on a spring, and vacuum causes the wastegate to open?
- or it is held open on a spring and the vacuum causes it to shut?
I have had a poke around and the mechanism moves one way only, towards the actuator. Is this correct?
also how do I tell if the adjustment on the wastegate spring arm is correctly positioned; for example - if it has been fitted incorrectly the wastegate may be partially open on normal running.
any help or informaion would be greatly received!!
my haynes manual is of little use!