1997 GMC Yukon Repair Question
Topics covered: Black smoke, Engine, Fuel pressure.
Mileage: 160,000 miles.
Mileage: 160,000 miles.
Asked on November 12, 2012
GMC Yukon Black smoke Problem
My vehicle gives out black smoke. i have replaced the fuel pump, i got the engine and injector system flushed but still the black smoke comes and engine oil becomes black within four days.
Asked by (pending member)Answer
Replied on November 12, 2012
-Your A/F mix is too rich-possibly stuck in the open loop mode, a dead 02 sensor, leaky injectors and fuel pressure regulator-Check the fuel pressure with a gauge if its within specs-though its new-start here
