Question about 1997 Mercury Sable
My sister-in-law has a 1997 Mercury Sable with OHV 3.0L engine and has a persistent misfirer code for cyls. 1&2. The boots for both plugs were burned up so new plugs and wires were installed. The engine now runs better (a little rough at idle, fine otherwise) but the misfire code keeps coming back. Not to mention the previous owner had removed the MIL lamp (rather than change the bad wires). And I have no idea how long the car was driven like this. Any input would be appreciated
They may have done a relative compression test which is done electronically by measuring the RPM drop of each cylinder when the test is running, but not sure anyone but the dealer can do this test. This low compression you mentioned is not good, suggest u run the test yourself, the compression test guage kits are cheap u can buy them on line for about $25 US, also tank added chemicals don't do anything in the short term and noting if the injector is badly clogged, do u understand what I mean about a high pressure factory cleaning? it is quite a different animal.
Posted on Jan 21, 2009
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Posted on Jan 02, 2017
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Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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