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87 STEPPER · 03-24-2009, 08:06 PM

Hey welcome to the board.

The first thing i'd check is the fuel pressure regulator diaphragm and spring if either are defective and the fuel pressure isn't regulated properly the fuel pressure will be to high causing a rich condition thats why you are seeing all that black smoke.

This requires thking apart your TBI assembly.

If you google model 220 TBI you can find a complete brake down of the TBI unit.

Good luck.

03-24-2009, 08:06 PM	#2
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Re: 87 454 tbi black smoke Hey welcome to the board. The first thing i'd check is the fuel pressure regulator diaphragm and spring if either are defective and the fuel pressure isn't regulated properly the fuel pressure will be to high causing a rich condition thats why you are seeing all that black smoke. This requires thking apart your TBI assembly. If you google model 220 TBI you can find a complete brake down of the TBI unit. Good luck. __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE