Just wondering if any experts out there can give some direction on 4.6L.
crown victoria - runs great with your foot in it -but sometimes very
rough, almost stalling idle - even when dead cold. Diagnostics indicates
lean mixture from O2 sensor and EGR sensor circuit problem - but EGR
doesnt work until car is warm, so dont think it is EGR related. It is a
great car othersise (other than those crazy cable power windows!) - thanx
for any info. bob d.
My first guess id that you have a pretty good vacuun leak somewhere (rough
lean code). The EGR code "may" indicate the valve stuck open, thus the rough
lean indication. Start there after checking for visible vacuum leaks.
My '95 did that for quite a while before it set a lean code. I found the
problem by sound. The PCV tube from the valve in the rocker cover to the
rear of the engine is metal except for a short bit of hose at each end. The
rear bit of hose had a hole in it. It had a curve in it and the hole was at
the curve. I didn't really see it, I heard it. New 3" piece of hose, no
more problems. Lot's more zoom, too!
sounds like a Vacuum problem... My 93 had a similar problem with the
line that runs from the passenger side to the driver's side... it's
the same line your PCV is plugged into... I'd check that one first...
As we know, there are known knowns; there are things we
know we know. We also know there are known unknowns;
that is to say we know there are some things we do not
know. But there are also unknown unknowns
--the ones we don't know we don't know." D. Rumsfeld
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