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Did this behavior change after your "mechanics" worked Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Sun, 26 Feb 2012 20:33:07 In Reply to: Adjusting boost pressure ('93 Aero), SMP, Sun, 26 Feb 2012 09:33:36 Members do not see ads below this line. - Help Keep This Site Online - Signup |
on your car? Note that I am putting "mechanics" in quotes. If this changed over the course of their work on your car, then there is a good chance that they hooked something up incorrectly, i.e. perhaps they reversed a couple of the hoses that go to the Boost Pressure Control solenoid, or did something wrong with the vacuum hoses - I assume that your '93 car has TCS, so there are more hoses to deal with.
Unless they separated the turbo from the wastegate actuator, which is mounted on the turbo, then they should not have needed to touch the adjustment for "base boost". Also, the base boost setting should not affect the reading on the boost gauge at idle.
Base boost is measured by attaching a vacuum/pressure gauge to the intake manifold (there are extra ports, or use the leg of the "T" that goes to the dashboard gauge) with about six feet of vacuum tubing, route it out the back of the hood and into the car; you now connect the wastegate to the pressure port on the turbo, and measure - should get about 5.5 PSI if set correctly.
If you feel that you need to adjust this setting, do a search for how to set or adjust "base boost" - basically, you loosen the actuator rod, change its length, tighten it, go for a ride to remeasure. Note to ensure that the male threaded rod does NOT turn on the actuator section diaphragm when adjusting, as this can damage the actuator - a thin piece of rubber.
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