Date: Sat, 20 Sep 2003 20:27:16 +0100 From: Grunff <grunff232nopsam.com> Subject: Re: 9-3 Boost problem /solenoid valve?
Robert Brown wrote: Hi Robert, > Disconnected wastegate pipe from solenoid valve (the black thing with > three hoses and electrical connector attached, known as "magnetventil" > in Swedish) and floored the gas pedal, but boost does *not* shoot way up > into the red, as it should. Reassembled. This should eliminate the solenoid valve as a possible failure, since you've effectively removed it from the control loop. > Detached the circlip and wastegate arm to confirm that wastegate on > turbo moves freely (it does). Reassembled, lots of copper grease. Took > the whole thing to the repair shop and got following results: > > Saab dealer confirmed base boost 0,24 bar, max boost 0,6 bar (should be > 1,0 by the way). > > But they note - no leaks in intercooler circuit, no engine error codes, > exhaust pipe was disconnected to check turbine (they say it's OK), > wastegate examined (OK as well). Hoses checked for leaks (none). My money is on a leak - you didn't mention whether they checked the dump valve (turbo bypass valve, plastic thingy). This is a very common source of trouble. To check, locate the valve, follow the small tube to where it joins other tubes, disconnect it at that end, and suck on it. If you pull air, the valve diaphragm is holed. > The only thing they could not do was check the solenoid valve, nor did > they have a spare with which to test the car. So they could not reach a > conclusion, but said they suspect the solenoid valve. I just can't see how it could be that, given how you've tested it. > Of course I > ordered one and it will arrive on Tuesday (at EUR 40, it's a cheap > test), and I will take 5 minutes to install it at home. > > So until then, I am wondering whether all these symptoms really *do* > point to a failed solenoid valve. Symptoms certainly could be bad soleboid valve, but your test says not. > I'd thought that the *absence* of excessive boost upon disconnecting the > wastegate pipe from the solenoid valve would have indicated a fault > elsewhere. Agree. -- Grunff
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