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

Tiny
JJAMES
  • MEMBER
  • 1998 MAZDA MILLENIA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
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
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Sunday, June 29th, 2008 AT 10:07 PM

8 Replies

Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Have you checked the coilpack/ignition module?
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Sunday, June 29th, 2008 AT 10:10 PM
Tiny
JJAMES
  • MEMBER
  • 4 POSTS
A coil pack would affect ALL the cylinders wouldn't it? Where would I look for it and what does it look like?

Thanks
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Sunday, June 29th, 2008 AT 10:15 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
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
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Sunday, June 29th, 2008 AT 10:31 PM
Tiny
JJAMES
  • MEMBER
  • 4 POSTS
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.
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Sunday, June 29th, 2008 AT 10:35 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Ok im sorry I was thinking DIS system
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Sunday, June 29th, 2008 AT 10:55 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
And you say your getting spark on all wires? Check crank and cam sensors
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Sunday, June 29th, 2008 AT 11:06 PM
Tiny
JJAMES
  • MEMBER
  • 4 POSTS
Any chance you know where they are located and how to test them?
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Sunday, June 29th, 2008 AT 11:10 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
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
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Monday, June 30th, 2008 AT 6:58 AM

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