mbc controller hooked up by bypassing the electronic device that is under the fuse bo

[Dan97gst]

I just replaced the isc the other night but I am not sure if this problem has anything to do with this because this problem started a couple of days before I replaced the isc. When i am driving down the road just cruising I will let off the gas just a little bit and it is like the car falls on its face and the factory boost gauge will spike real bad but my aftermarket gauge of course will not and on my wideband it will go ultra rich. I am not sure what would cause this, would it have anything to do with how I have my mbc controller hooked up by bypassing the electronic device that is under the fuse box. If that is it I do not understand why, because I have had this same set up for months now w/ no problems. Does anyone have any ideas? Thanks

 

[marcmsj]

Are you venting your BOV to atmosphere? If so, recirculate it and see if that helps.

 

[Dan97gst]

I am recirculating the bov

 

[zimfro]

If your stock boost guage is going crazy, look at your mass air-flow sensor. From what I understand, the ECU calculates the boost to show on the stock guage by looking at how much air is flowing through the MAS. If the ECU "thinks" that there is a boost surge, it will start dumping more gas.

 

[Dan97gst]

could this problem be caused by the tps, I took it up to a local shop and he said that is what he thinks it is. He also read the check engine light code and it was a waist-gate actuator code, but the my waist gate is working fine, could this be beacuse of the electornic sensor that is ran off the actuator and the compressor housing. And if so could this possibly be the cause of my problem.

 

[steve]

You need to leave the BCS (wastegate control solenoid) plugged in to the harness on a 2G. The hoses can be disconnected but the ECU is going to look for the electrical load of the solenoid and throw a CEL if it's not there.

 

[Dan97gst]

Oh ok I was just checking that is what I thought, I never unpluged it I just left the hoses off. I guess maybe the plug came loose or something.