Too rich while under boost causing bucking and black exhasut

[90GSX55trim]

Hey guys so when i drive my car when it starts to build any boost at all like even 0-1PSI the car bucks and shakes and the exhaust turns black, so i believe the car is running too rich but only under boost conditions otherwise under vaccumm conditions the car runs beautiful. Checked the fuel pressure regulator that was good, however i do have a 3inch GM MAF with the maft suppossibly the green light inside should come on but it does not i am wondering if that can be the problem but why only under boost? Also i heard something along the lines of off ignition timing is that at all possible? Maybe the O2 sensor or the ECM? Help Please thanks everyone!

 

[5150DSM]

Sounds like you have the unit wired incorrectly or possibly have a dead sensor. No green light on the MAFT means no airflow signal to the ECU, no airflow signal means the ECU will default into "safe" mode, which is basically pig rich with very low timing. Check these out and go through both your wiring and your settings to correct the issue.

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[zbenes674]

Happened to me with my last set up, ended up being the maf-t. went back to stock and was fine.

 

[90GSX55trim]

So the actual car ecu will revert to safe mode? And is there anyway to test the maft? I am going to check the plug however I didn't realize the connector would fit both ways and also I do not have the white wire hooked up which I beleive the unit can work fine without that wire being connected. And zbenes unfortunatly the stock maf is bad that's why I bought the maft because a stock one was like $200+

 

[Tim_I]

the white wire is rpm signal. It's used for wide open throttle tuning, you can run with it unhooked. its unhooked on my car and my buddys car and both run just fine. but if u wanna switch the MAFT to do full throttle tuning after your idle and cruise are setup u need to hook it up.

 

[90GSX55trim]

Does this seem like an issue of needing to be tuned or the translator itself is bad? And there's no way at all to tell if the maft is good?