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5kCSQ Overboost problem
Well, my car is still overboosting and running into the fuel pump cutoff.
So, today, I do some more checks...
First I find the breather hose between the valve cover and the intake has
turned to mush and has a hole in it. $30 and a happy dealer later, that's
I ran thru the Bentley checks - the solenoid valve does appear to be
working, and does activate when you short out the WOT contacts. At this
point, I found the WOT switch wasn't working... OK so I pull it off and
break it apart. This puppy has another failure mode: all four soldered
connections had broken apart and were intermittant (it wasn't visible
of course). So out with the soldering gun and I get this fixed.
It still overboosts! Currently I've disconnected and plugged the pipe
from the solenoid valve to the wastegate. No more overboost - I'm getting
5 to 6PSI boost.
It's also running a little lean; at idle the duty cycle is 50-55 degrees so
it looks like there is still a vacuum leak somewhere. Last time I checked,
the duty cycle was around 40degrees.
Any ideas on the overboost?