Re: TQC boost problem?

[dlawson@ball.com (Dave Lawson)]

George,

>My theory is the brain thinks I'm overboosting and is retarding the timing.
>How can there be overboost even when the engine is not running????
>Any help appreciated.

On this euro 85, I am assuming that the ECU has a boost pressure
display signal comming from it. Could be wrong. Or does the dash
display still have its own pressure gauge, just digital in this instance?

I would start by looking through the check valves in the vacum line
system going to the ECU. Not sure of a failure mode of these, but
maybe it has trapped boost pressure in the line feeding the ECU
pressure sensor. After this I would test the pressure sensor, pull the
hose from it, and see if it reads 0 bar, then maybe attach a piece of vac
line on it and slightly blow on it to see if the display changes. If it
doesn't read 0 or change with different pressures, something is wrong
with the ECU and/or pressure sensor.

Good luck and report back the findings.
 -
Dave Lawson  dlawson@ball.com