Check engine light

Tiny
KODOS
  • FORD EXPEDITION

I have a 1998 ford expedition.A few months ago it would run rough and the check engine light would come on. This problem was intermittent though. Now its constant. The trouble codes read misfire on cylinders 3 and 8. Replaced the spark plugs and wires. No difference…the spark to those cylinders seems strong and consistant. Any ideas. Thank you.

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Thursday, July 26th, 2007 AT 6:33 PM

3 Replies

Tiny
KIN CHAN
  • MEMBER

Hey man. Thats coil on plug. How can u see the spark. Thats not a convention distributor single coil system.U puliin my leg right?

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Thursday, July 26th, 2007 AT 7:52 PM
Tiny
KODOS
  • MEMBER

No coil on plug. Coil packs.I can pull the plug wires off while its running and the spark is very strong. And my timing light reads exactly the same rpm on all 8 cylinders.

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Friday, July 27th, 2007 AT 10:03 AM
Tiny
KIN CHAN
  • MEMBER

U do that on a late model GM car n u gonna buy modules and coils. Dont ever pull ignition cpts off while engine is runnin on a late model car. Its got a spark but not conclusive. Becuz it imake a spark in atmospheric condition. Inside the combustion chamber it is hundreds psi of pressure. Coil on plug is coil pack. Most ford has problem on coil pack for individual cylinder misfiring. Swap coil and chk if the indivduals misfire change to another cyl. From a suspectible bad coil.

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Friday, July 27th, 2007 AT 1:34 PM

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