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Old 08-26-2005, 03:42 PM
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'92 mercury sable

hi guys ,
i'm helping out my dad fix this car, it is a 1992 mercury sable V6 3.8L, the problem is that the #4 cylinder does not work, there is spark, the injector works, it has compression, and my dad putted a new computer, but nothing, the #4 cilynder still does not work.
anybody has any idea what might be happening. any help will be appreciated it. thanks

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Old 08-26-2005, 05:01 PM
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You mean it's not firing? maybe your spark is too weak to the #4. Check your coil and your distributor and replace them if needed.
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Old 08-26-2005, 09:35 PM
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How did you determine the cylinder was dead. Did you start pulling plug wires untill the RPMs didn't change?

You said the injector works. Did you check for signal to the injector? Or did you swap it for a known working injector from another cylinder? It could be a broken wire in the harness.

How did you check for spark? Did you use a tester and check by the color of the spark? Should be blue, if it is yellow it could be a plug wire or coil.

Does it have a distributor or a coil pack setup? It could be a bad coil pack, bad distibutor cap or ignition module.
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Old 08-29-2005, 08:59 PM
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Thanks for the help guys!!!!!!!!!!
sorry that i didn't answer before, the problem was that a wire from the injector was broken. thanks again
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Old 08-30-2005, 05:42 PM
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Still doesn't explain how you discovered that the #4 cylinder was "dead".
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Old 08-30-2005, 07:49 PM
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i started pulling the plug wires until the RPMs didn't change, then when i discovered that the #4 cylinder did not work, i checked the spark( it had a blue spark) then i swap the injector for one that i knew it worked, and the #4 cylinder still didn't work. then i temporarily swap the computer from another car that worked fine, and it made no difference.
Then a friend of mine tested each injector with a testing light that plugs in the injector connector, and one of the wires of the injector that went to the #4 cylinder was broken.
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Old 08-31-2005, 11:38 AM
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Ok then.
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