Question about 2002 Nissan Sentra

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What is the wire that plugs into the back of the coil pack? The computer said Cylinder 3 misfire. Have checked the spark plug, spark plug boot, and the coil pack.

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  • Anonymous Aug 04, 2010

    Checked how? What type of test did you perform? Visual Inspection? What computer,a code reader at parts store?

  • samhfoster Aug 05, 2010

    Yes I used a code reader from O'reillys. I changed out the spark plugs after the first time i read the code, then I cleared it. When the light came on again. I reran the code, and it still says cylinder 3 misfire, so I switched the boot and coil pack from cylinder with the cylinder 1, and cleared the code again. Then the Check engine light came on again. I had the cat converter checked. So now I'm down to either a fuel injector or a burned valve. The wire that plugs into the coil pack is what goes to the fuel injector right? I could switch the fuel injector from cylinder 3 to cylinder 1 and clear the code again, and see if the problem moves with me right?



1 Answer

You leave all coil pack connectors on their respective cylinders.
Usually the crank position sensor tells, the computer where the pistons are,by where the flywheel is,as it passes the sensor.
You leave all injector connectors in their number sequence.
Every vehicle uses different ways of pulsing the injectors. Not familiar with yours

Most likely NO,to the coils and injectors being tied together.
You can not spray fuel and try to ignite it, at the same time,it has to get into the cylinder and be compressed, one cycle before the spark.

You could switch injectors,and a relative did that, earlier this year, based on your theory. Sound thinking,a lot of work and not your problem.

Might add, that while your plugs may needed to be replaced,they had no effect either. Personally, never had a plug failure in 45 years,could happen I guess.

So you buy one new coil,start on one side of engine,and walk that coil from one cylinder to the next,every time you get a 300 misfire code. Put the OE back and move the new one. Consider you may have others on their way to going bad.

Make sure you have no vacuum leaks anywhere.

Posted on Aug 06, 2010


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