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General Maintenance, Troubleshooting & Accidents. What kind of oil should I put in my car for drag racing? When should I change the spark plugs? How do I fix that rattling sound I'm hearing? Ask your maintenence questions here!

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Old 07-06-2009, 09:24 PM   #16 (permalink)
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Im still going to take it to the dealer tommarow, I hooked up the tubes and the CEL went off but power delivery isnt nearly as smooth. the car kinda rocks front and back while under WOT I dont know how to explain it. Also its not boosting nearly as much, I dont think I saw it go over 8. I assume this isnt normal? Ive never owned a turbo car so I dont know.
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Old 07-07-2009, 07:22 AM   #17 (permalink)
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I had a nice reply all typed out, but I can't post links without 3 posts, so...

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Old 07-07-2009, 07:23 AM   #18 (permalink)
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Ok, here it is:

Glad I could help. Sounds to me like your BCS isn't hooked up properly or isn't working properly. You should have a vacuum line running from the wastegate actuator to a tee. One side of the tee goes to the turbo or piping very close to it, and the other side goes to the BCS. On the other side of the BCS, there should be a line plumbed back into the intake tube, pre-turbo. Make sure the wiring to the BCS is plugged in and looks ok. Read this link and take a look at the pic. The BCS is the wastegate solenoid valve.

Boost Control FAQ: Read if you are thinking of buying one! - NASIOC

This next thread has some useful pics showing locations in the engine bay, but the thread is about installing a GM BCS as a mod.

Full DIY: GM solenoid install (56k warning) - NASIOC
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