1998 Mazda Millenia Check Engine light - Misfire in Cyl #5

1998 MAZDA MILLENIA
125,000 MILES • 6 CYL • 2WD • AUTOMATIC
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JJAMES
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I have replaced plugs, wires, rotor, cap, O2 sensors, throttle body tube. after 60 miles all plugs except #5 were clean, the #5 was oily brown. Engine shakes. Compression tests shows 1-140, 2-140, 3-133, 4-140, 5-147, 6-145. Leakdown tests showed Nothing.
cleaned oily plug & no difference. Mechanic inspection said NO timing belt issues. Anyone ever have this problem? Any suggestions?

2.5 liter base model. Non-turbo
Jun 29, 2008 at 10:07 PM
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LEGITIMATE007
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have you checked the coilpack/ignition module?
Jun 29, 2008 at 10:10 PM
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JJAMES
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A coil pack would affect ALL the cylinders wouldn't it? Where would I look for it and what does it look like?

Thanks
Jun 29, 2008 at 10:15 PM
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LEGITIMATE007
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no that is not necessarily true there are six plugs on the pack , therefore one ,two or all can go bad, it is at the other end of the spark plug wires. one end of the wires goto the spark plug and the other goes to the ignition module/coil pack
Jun 29, 2008 at 10:31 PM
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JJAMES
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This vehicle has a distributor and rotor combo of which I replaced to rotor and cap about 6 mo's ago and then cleaned up the electrode ends yesterday. The spark feeds come from the ECM module under the cap thru the center of the rotor.
Jun 29, 2008 at 10:35 PM
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LEGITIMATE007
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ok im sorry I was thinking DIS system
Jun 29, 2008 at 10:55 PM
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LEGITIMATE007
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and you say your getting spark on all wires? check crank and cam sensors
Jun 29, 2008 at 11:06 PM
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JJAMES
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Any chance you know where they are located and how to test them?
Jun 29, 2008 at 11:10 PM
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LEGITIMATE007
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they both will be located, on the pulley side of the engine, and at the beginning of of both shafts. the crank should be embedded in the timing chain cover right where the crank is. to test get a test meter, and put it on ohm setting and test for resistence. I believe if the resistence is very low then its an open circuit, if its really high(infinity) then its good
Jun 30, 2008 at 6:58 AM
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