flyvsdrive
Member
I've been looking for a couple of days through the forums and I can't seem to find a definite answer on this one, so I figured I'd fire up a new thread.
The actuator on my MK5 BRM KKK Borg Warner turbo no longer holds vacuum. No CEL, but a stored code of "Intermittent low boost pressure". Basically, with this low vane angle, the turbo only begins to make normal boost above 2300 or so RPM.
I've checked N75, it's requesting full boost (20" vacuum). I've checked the line from the N75 to the actuator, no leaks. The actuator arm moves freely from stop to stop. Only when I connect my vacuum pump directly to the actuator do I get 0" vacuum. So, it's a big leak. Torn diaphragm I guess?
So, I have two questions:
1.) Has anyone out there found a direct replacement for this specific actuator? I'd rather replace it alone rather than the whole turbo since the turbo has no problems. All I can find so far is the whole package (manifold, turbo, actuator - $1000 - $1300 range).
2.) Why isn't the CEL coming on or a code being stored saying that the actuator arm isn't moving? It's got a sensor on it. I would think if the ECU tells the N75 to move the arm and the arm doesn't move, that the ECU should say "what gives??" and throw on a light or store a code. However, since this isn't happening, it makes me think that the sensor is there but that the ECU isn't monitoring it's position. Kind of like the engineers thought they were going to use it but at the last minute decided they didn't need it. Anyone know if the ECU really looks at the actuator sensor position? If not, I can potentially just get a random vacuum actuator from Forge or someone and just leave my smart actuator connected but lay it off to the side elsewhere in the engine compartment.
Your help is appreciated.
Thanks
The actuator on my MK5 BRM KKK Borg Warner turbo no longer holds vacuum. No CEL, but a stored code of "Intermittent low boost pressure". Basically, with this low vane angle, the turbo only begins to make normal boost above 2300 or so RPM.
I've checked N75, it's requesting full boost (20" vacuum). I've checked the line from the N75 to the actuator, no leaks. The actuator arm moves freely from stop to stop. Only when I connect my vacuum pump directly to the actuator do I get 0" vacuum. So, it's a big leak. Torn diaphragm I guess?
So, I have two questions:
1.) Has anyone out there found a direct replacement for this specific actuator? I'd rather replace it alone rather than the whole turbo since the turbo has no problems. All I can find so far is the whole package (manifold, turbo, actuator - $1000 - $1300 range).
2.) Why isn't the CEL coming on or a code being stored saying that the actuator arm isn't moving? It's got a sensor on it. I would think if the ECU tells the N75 to move the arm and the arm doesn't move, that the ECU should say "what gives??" and throw on a light or store a code. However, since this isn't happening, it makes me think that the sensor is there but that the ECU isn't monitoring it's position. Kind of like the engineers thought they were going to use it but at the last minute decided they didn't need it. Anyone know if the ECU really looks at the actuator sensor position? If not, I can potentially just get a random vacuum actuator from Forge or someone and just leave my smart actuator connected but lay it off to the side elsewhere in the engine compartment.
Your help is appreciated.
Thanks
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