Check engine light/07Merc Grand Marquis

Asked by Jan 28, 2019 at 02:40 PM about the 1997 Mercury Grand Marquis 4 Dr GS Sedan

Question type: Maintenance & Repair

Check engine light won't go off.  Says the fuel mix is too lean.  What do I have
to do now?

1 Answer

76,335

Most of the time, this is just a vacuum leak which could involve the EGR or PCV valves. Could be a leaking intake manifold gasket. I'm guessing you have an erratic idle, too.

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