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99 ford explorer. Check engine light flashes when driving and engine feels like nor firing correct. Went to auto zone to diagnose and they said 6 cylinder not misfire. Changed plug but still continues to misfire. What else can I check?

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Check the coil packs

Posted on Apr 22, 2013

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

StormStrikes
  • 104 Answers

SOURCE: engine misfires

You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

Posted on Dec 31, 2008

chuck943
  • 783 Answers

SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

Posted on Feb 05, 2009

  • 599 Answers

SOURCE: 2002 Ford Explorer V6 misfire

check for spark/fuel /vacuum -air leaks.....test plugs..then wires .and egr valve and snorkle and intake areas for air being introduced near each cylinder with carb cleaner wafted near then while idling

Posted on Mar 14, 2009

  • 2 Answers

SOURCE: 99 Maxima jerking

try changing the spark plugs first ,then check ignition coils .

Posted on Apr 29, 2009

  • 1 Answer

SOURCE: ACURA TL 2000 check engine light is flashing

i have a Acura 2000 tl .Check Engine light is flashing. i don't know what to do?

Posted on Jun 02, 2010

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