Question about 1997 Mercury Sable

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1997 Mercury Sable Misfire

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

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  • risetony Jan 21, 2009

    The car has 90K, and we did put Techron in the tank a couple of months ago. I listened to the injectors and only no. 1 sounds weak, the rest sound strong. The shop insists the compression was tested with the back three around 60# but the front at 120# each(I doubt it since this involves removing the plugs and testing each cylinder, and they didn't charge for the service).

  • risetony Jan 21, 2009

    I do know the difference, we just put the stuff in the tank, really just for the heck of it. If the power cleaning can do the job, I would try that before changing any injectors. I have a compression tester, and will do a proper test, when the temp. outside climbs into the 50's. Probably in a month or so. I'm just planning for the next move. Oil usage seems normal, and listening at the tailpipe doesn't sound like any serious miss, at least not related to internal wear or damage like valves or rings. I'm betting cleaning the injectors, and maybe removing carbon from the cylinders because of the bad plug wires may be the underlying cause.

  • yadayada
    yadayada May 11, 2010

    how many miles? have u had the fuel injectors pressure cleaned, only the dealer can do his, it works, have cleared many rough runs and outright misses with factory injector cleaning setup, the outside shops often just dump cleaner in the gas tank, that doesn't work

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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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P0301 - Cylinder 1 Misfire Detected.

Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
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P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

Causes:
- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
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