Everything has to be working or the computer will put the car in limp home no boost mode. With the egr etc blocked off, the computer knows this and will shut down the boost. The only way to get the car running like it should is go to thru the 170 some page diagnostic procedure on the CD. Have fun!!
--- Kaleb C. Striplin Cox Auto Trader 730-Tulsa FSBO Supervisor ----- Original Message ----- From: "Tony Wirtel" <[EMAIL PROTECTED]> To: <mercedes@okiebenz.com> Sent: Sunday, December 02, 2007 9:40 PM Subject: [MBZ] No boost in '91 300d > I've got the 300d home and found that the transmission needs a rebuild > as expected, but also that I don't have boost. > > What I know: > > - Tracing vacuum diagrams I found that the EGR and recirc flap control > have already been BB'ed at the vacuum source > - Turbo seems to turn freely. Some oil in the intake but nothing big. > - Putting pressure gauge in line between intake and ALDA see about 3 PSI, > max. > - With pressure to ALDA on acceleration (5-10 PSI) there isn't a jump > in power from expected fuel enrichment > - Putting a line direct from intake to ALDA doesn't help (something > that worked on another car) > - Applying pressure to the ALDA shows minimal leakage > - EGR has a plate covering the port > - Turbo overpressure rod moves freely > - Car doe not appear to have a cat/trap in the exhaust system > - OVP is OK > > This car has a LOT more going on than the last car I had a no-boost > problem with. On that, a 300sdl, jumping a failed switchover valve > fixed it. This car has at least 2 more vacuum/pressure control pots, > a mass air flow sensor, and a boost sensor near the battery. I'm not > familiar with any of these, and the service CD's are at best spotty > with coverage. > > My questions: > > - With the added systems is there an electrical element added to the > injection pump that would prevent enrichment when jumpering the intake > to ALDA? > - Does anyone have a used Garrett TB025 turbo if mine proves bad > - Anywhere else I should be looking? > > Thanks! > > Tony Wirtel > > _______________________________________ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
