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is my turbo shot... Posted by michael [Email] ![]() ![]() |
...or am i missing something here? '91 c900tc.
had the car 2 mos now. set base boost to 5.5psi the other day. running great, boosting just to red (from about 3/4 before), i'm happy, life is good. during some spirited acceleration the car abruptly lost boost. since then, it pulls strong until boost gets just into orange, then suddenly backs off to atmospheric pressure. doesn't get anywhere near base boost. a couple of times, while accelerating gently, i've been able to boost 1/2 into orange before dying off again. car otherwise runs fine. i've looked for leaks. checked clamps/hoses, removed/inspected ic tubing, etc. i would think it would have to be a huge leak to lose all boost though, and should be obvious, no? don't know what it's supposed to feel like, but the wg arm moves freely (too freely?). in neutral, i can hear a difference when moving the arm back and forth, and feel some fluttering resistance when moving it. the actuator feels like it has a strong spring and the wg is closed with the actuator attached. disconnected the "w" line from solenoid without a change in boost. the turbo isn't making any unusual noises at speed, and in fact sounds like it's spooling up normally. anything i'm missing here? what's the next step?
posted by 68.11.50...
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