Running Rich/black smoke

Asked by kevinferrell444 Nov 08, 2019 at 12:21 PM about the 1991 Chevrolet C/K 1500 Silverado LB RWD

Question type: Maintenance & Repair

i have a 1991 Silverado 350 with 130,000 orig miles but its running rich/black
smoke whe you riv the motor. So far i have put new plugs wires cap rotor 02
sensor new breather new temp sensor no help.

2 Answers

kevinferrell444 answered 5 years ago

It could be either of those id say but engine runs smooth, Idles perfect, takes gas prefect. No hesitation when u punch it. So not sure...

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KenF answered 5 years ago

I would also suggest fuel pressure regulator, they can go bad and develop a nasty diaphragm leak that causes raw fuel to be burnt.

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