Question about 1996 Mercury Mystique
Replaced o2 front sencor gas milage came back to 30mpg but still runs rough and idle hard cant find leak any where
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Posted on Jan 02, 2017
Try new plugs, wires, fuel filter, air filter, pcv valve, and if its still not too
good,, do the 02 sensors..
Have a good day !
Posted on Oct 24, 2009
Sounds like you might have a stuck open EGR valve. Is the check engine light on. I would replace the fuel filter if it hasn't been replaced, also check the air filter.
Posted on May 31, 2010
SOURCE: when warm runs rough sets
If the cat is cherry red as you say it is I would check the firing order or timing they may have crossed plug wires this will cause the exhaust manifolds to get red hot and glow let me know if this heled you and good luck.It definitely sound to be timing related or crossed wires.
Posted on Feb 09, 2011
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