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Old 11-17-2013, 02:37 PM   #1
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Default 2001 Bonneville supercharger boost problems. HELP!

2001 Bonneville supercharger boost problems. HELP!-img_20131117_132813.jpg

As you may or may not see (in case I uploaded it wrong) that my boost gauge is reading at almost 0 at idle. It also buries itself when accelerating. If I don't let off immediately the motor feels like it'* misfiring and the SES light starts flashing. This is the only time I get any kind of misfire. The motor runs great the rest of the time. I've fixed vacuum leaks, changed plugs and wires, had cat converter checked out, changed front O2 sensor, all with no change. I can't find anything online related to this specific problem. Someone please help!
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Old 11-17-2013, 07:06 PM   #2
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Yea, if the check engine light is flashing and you got the pedal buried, get out of it. The PCM is probably seeing KR(knock, so its retarding your ignition) which is a really bad thing.

I'm not familiar with the stock boost gauges on these cars. But the most you should see is around 6-8psi at full load with a stock engine. 0 to -10 at idle is normal for an engine. I'm wondering if you have a bad MAP sensor.

If you can, please get your car scanned for any codes, this will help diagnose your issue.

Moved to 2000-2005 section for better visibility.
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Old 11-17-2013, 08:42 PM   #3
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It'* not the accelerator that'* buried it'* the boost gauge. As soon as it gets close to the yellow line i let off. I was just trying explain the situation. The service engine light only flashed on one occasion when it down shifted into the passing gear. It'* frustrating cause the car runs great except for this. Someone else suggested the map sensor as well. I'll try it. Appreciate the help and will post the results
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Old 11-17-2013, 10:06 PM   #4
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Check that the boost solenoid is working, and the activation arm is retracting and extending completely. With the engine running and in park observe the position of the rod that comes out of the BCS. Pull the vacuum line off (plug the end with your finger) and see how the BCS arm reacts.

I just want to determine if the BCS is moving freely, or stuck in the full boost position.
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Old 11-18-2013, 08:50 AM   #5
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Ok, i will check the bcm arm. I have had the car scanned. I have a matco scanner. I'm not showing any codes except for the rf wheel speed sensor that i changed the wheel bearing on yesterday but it must be something in the wire. I don't have a service light on either. If the map sensor was bad wouldn't it throw a code? Idk. I'll the solenoid as well.
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Old 11-18-2013, 04:40 PM   #6
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Ok, when i pull the bottom vacuum line off and stick my finger on the bcs and plug the hole with my finger it does nothing. When i pull the top hose of it drops slowly to the hard stop. Idk if that'* good or bad. The arm itself is not stuck.
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Old 11-19-2013, 12:45 PM   #7
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When the car is not running, the arm on the boost control actuator should be fully extended. When you start the car, the arm "pulls up" into the actuator. Under WOT the arm will again extend (to the position it is in when the car is not running) to open the */C gate valve. In other words, when the arm is retracted into the actuator you have no boost. When the arm is extended out of the actuator you have full boost. High vacuum (idle) no boost, low vacuum (engine off, or WOT) full boost.

If the arm extends when you unplug the vacuum lines it is operating as intended.

Have you scanned for trouble codes?
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