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Old 07-11-2018, 08:41 PM
v8volvo v8volvo is offline
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Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
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The D24TIC turbo may be different. But for the D24T turbo and most other wastegate type turbos, the hose to the wastegate carries pressure instead of vacuum, providing the force to open the wastegate when the spring is overcome. Thus if the hose fails the result is too much boost rather than a loss of boost. No boost would more likely be a stuck open wastegate or actuator, or something else.

If the turbo on the D24TIC has an external wastegate and actuator with a rod you can see, then one thing you could check would be to take off the clip where the actuator rod meets the wastegate arm and separate them, then try moving the wastegate arm and see if either it or the actuator is frozen. The actuator spring is strong but usually you can move them at least a little with some finger pressure.

Fuel and air filters would be good to check also. If either one of them is restricted the symptoms can mimic a turbo problem. Both are cheap so if in doubt, always worth a try replacing them and see if it makes a difference.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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