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59 Posts
Hey all,
I have a 98 GS with a GenV supercharger and intake upgrade that was running great for a while, but now seems to Only be maxing out at 3psi boost. It used to intermittently do this once in a while but would correct itself and then it became more often and would only correct itself once in a blue moon... now it never corrects itself and stuck at 3psi. Fuel mileage is pretty brutal. I did notice the boost bypass valve under idle conditions is stuck down (no bypass) where it used to be up (bypass) and I think that the actuator is not functioning properly. I replaced it with another one and seems to have the same issue. I think it may be in the wiring. If I unplug the BBV (Haha as a side note my phone changed BBV into BBC autocorrect... Definitely not BBC Lol) there is no difference in the way the car runs or the way the valve acts at idle. If I spike the throttle the valve stays down for the split second that it is raving up but as the throttle is released it swings up slightly then slowly rests back down. From what I used to remember it would rest in the up position and when you would spike the throttle it would spike the valve down and then return to up position. Is this correct? I am gonna try once more changing out the actuator and if that doesn't work looks like I am gonna be tracing some wiring short somewhere. Hopefully it will just be the connector and not some obscure place deep in the harness. Is there any other place somewhere that could be causing this issue? I get an occasional bank 2 fuel lean error code (from what I remember) and my long term fuel trims are quite high around 16-18% constantly but the short term is seeming to be normal. Especially at idle long term fuel is high.
Am I right thinking it is the BBV? Or could it be something else causing this?
I have a 98 GS with a GenV supercharger and intake upgrade that was running great for a while, but now seems to Only be maxing out at 3psi boost. It used to intermittently do this once in a while but would correct itself and then it became more often and would only correct itself once in a blue moon... now it never corrects itself and stuck at 3psi. Fuel mileage is pretty brutal. I did notice the boost bypass valve under idle conditions is stuck down (no bypass) where it used to be up (bypass) and I think that the actuator is not functioning properly. I replaced it with another one and seems to have the same issue. I think it may be in the wiring. If I unplug the BBV (Haha as a side note my phone changed BBV into BBC autocorrect... Definitely not BBC Lol) there is no difference in the way the car runs or the way the valve acts at idle. If I spike the throttle the valve stays down for the split second that it is raving up but as the throttle is released it swings up slightly then slowly rests back down. From what I used to remember it would rest in the up position and when you would spike the throttle it would spike the valve down and then return to up position. Is this correct? I am gonna try once more changing out the actuator and if that doesn't work looks like I am gonna be tracing some wiring short somewhere. Hopefully it will just be the connector and not some obscure place deep in the harness. Is there any other place somewhere that could be causing this issue? I get an occasional bank 2 fuel lean error code (from what I remember) and my long term fuel trims are quite high around 16-18% constantly but the short term is seeming to be normal. Especially at idle long term fuel is high.
Am I right thinking it is the BBV? Or could it be something else causing this?