Quote:
Originally Posted by kev0
@ steve99 Will a bad spark plug make the car run lean? Because my data shows that I have insanely high fuel trims and misfiring in Cyl 4 which leads me to believe that the intake manifold gasket in cylinder 4 has gone bad. The manifold did have oil and crud on it, so I believe it is the manifold gasket. |
Lean means too much air. Bad spark would go rich, too much fuel.
Lean is almost always a vacuum leak, could be injector, 2 sensor or ?? but vacuum leak is the first place to go.