1991 Lincoln, Executive Series, front-wheel drive, 3.8 V-6, 138,000
1) Intermittent "CO" message in the fuel guage area. What possible
malfunction(s) does this refer to?
2) Oil pressure readout goes low, intermittent. Returns to "normal" after a
period of time which varies. Bad sensor, wire or ground?
3) Motor runs fine with no load, in "park" and "neutral", and on dyno in
drive, accelerates through entire range with no problems, but seems to
misfire during actual road use under light to moderate acceleration.
Depending on speed when this occurs, the misfire or skip can range from a
single miss to multiple occurences which feel like the shudder of very
out-of-balance tires (at highway speeds). Motor smooths out immediately if
accelerator is released. This occurs even if overdrive is locked out. Oil
pressure goes low, but I should think that this is to be expected and
unrelated to #2.
Recent work: Car was parked for about 18 months, after A/C
compressor seized. Was driven approx. 3 miles with no serpentine belt.
Shortly before that, distributor was replaced during "routine" tune-up when
cap screw snapped off in housing and attempts to drill and tap destroyed the
Since resuming use of the car, both fron axles were replaced (CV
joints bad), ball joints and control arms replaced (worn), A/C compressor,
serp belt and battery replaced. (I don't think any of these are related,
included for completeness.)
I'm not a complete moron when it comes to cars, but the majority of
my experience comes from before computerized motor control and fuel
injection. (Give me a 1970 AMC Ambassador with a 360 4bbl and an unlimited
supply of gasoline and it would never see a profesional mechanic...damn, I
miss that car.)
Thanks for your consideration.