Question about 2000 Ford Expedition

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How do i change a plug wire and spark plug on the 2000 ford expidition. It read that it was mis firing on #6. Code 306

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How do i change a plug wire and spark plug on the - eddyblueange_8.jpgeddyblueange.gifBe very carefull dont drop noting into the spark hole

Posted on Dec 29, 2010

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There isn't a "spark plug wire". #6 cyl is the third one back on the driver's side. Remove the 7mm bolt that holds the coil pack on. Squeeze the plug and unplug it. Carefully pull it out making sure the boot and spring come out with it. With a spark plug socket (with a rubber insert) and a 6 inch extension. Remove the spark plug. Each cyl has it's own coil pack on top of the plug. They're around 75 dollars each. I hope I've helped. If so, please rate my answer and leave a testimonial.

Posted on Dec 29, 2010

  • Drew Z
    Drew Z Dec 30, 2010

    Sorry number 6 is the second one back on the driver's side.

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I HAVE A 1998 GMC SONOMA 2.2 4 CYL HAVE WENT THROUGH THE ENTIRE FIRING SYSTEM AND HAVE A VERY BAD DEAD MISS


Were there any applicable trouble codes? The code might tell you which cylinder has a problem, where applicable?
Sometimes you can use a digital multimeter, low voltage setting, touch the spark plug wires, one at a time, where applicable, engine idling. It is an inductive reading, you don't penetrate the insulation and don't take spark plug wire loose. Some of the readings I've seen are around .6 or .7 volts. Point is, if you get a reading bouncing off zero, that is where you start testing. I'm just trying to rule something out. With cylinder mis-fire, check fuel--spark--compression.
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How do I know the numbers for the spark plugs to a 2000 nissan exterra 6 cylinder suv?


the misfire could also be the coil that is what send's the spark to the distributor, if it is weak it will cause a random mis fire code for any cylinder, the plug wire's on my 2000 xterra are numbered it will be the second plug on the driver's side of the engine, the cam sensor will also give a mis fire code if it is malfunctioning, I have a 2000 xterra that is a night mare when it come's to code's and repair's it is not alway's the first thing you think with these vehicle's, try to change all the plug's and dis connect the battery for 20 minutes then hook it back up and run down to your local autozone or pep boy's and have them hook up an OBD to see if it is fixed or if another code appear's

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Po306 new intake gaskets smoke test compression test leak down test new plugs wires tested injectors swapped injectors checked ijjector wiring with noid still when you pull off no 6 wire it changes nothing...


Code 306 means cylinder 6 is not producing power. And as you know it takes fuel, spark, and compression at the right time to make power.
Generally, if the injector is firing at the right time the spark plug should be firing as well.
Are you sure the plug is firing ? And is it possible injector 6 has no fuel to spray ?

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Started engine and was running rough Check engine lamp came on Used code reader and found code p0306 Remove plugs Compression test no.6 was 175 and the rest were 150 replaced spark plugs and retry Still...


You've done a great job of trouble shooting thus far. I would certainly suspect the injector after all of that. But, I didn't see anything about you replacing the spark plug itself. I would try that first as a crack in the insulator (even hairline) will cause mis-fires. If the spark plug doesn't fix the mis-fire, it cold be caused by a bad fuel injector, bad signal (like a loose harness or bad wire) to the fuel injector, or a leak or valve issue on that cylinder.

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2 Answers

Misfire on number 6. changed spark plugs and coil, still reads misfire on number 6


What vehicle?

Spark plugs never misfire, by design, Wear yes,that stresses the
ignition modules

If you have a coil, that is for all cylinders,the others fire okey !

We need your year,engine, V6, V8, etc, to help

You never change parts to solve any issue
That is called wishing,hoping,pushing,poking,

What code # did you get PO306?

Dec 05, 2010 | Buick Rainier Cars & Trucks

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Scanner said #4 cyl mis-fire changed #4 coil still reads #4 mis-fire any ideas


Replace the spark plug and if the problem still exsist replace the the ignition wire to the #4 cylinder.

Dec 01, 2010 | 2002 Ford Escape

2 Answers

Code po304 #4 cylinder mis fire


ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.

Oct 12, 2009 | 2000 Cadillac DeVille

1 Answer

I need the spark plug diagram for a 2001 ford expy. or at lest steps on how to replace the plugs. I have a mis fire in cyl. 1 if anybody could help.


4 cylinder? 1342 is the firing order.just change them one at a time. Mark the tower #1 plug wire goes to.

Jun 21, 2009 | 2000 Ford Expedition

2 Answers

Missfire 2000 expidition


there isn't a trouble code that indicates a bad coil... there are misfire codes that can possibly lead to a plug, coil, fuel injector, low compression, or a number of other things. it is possible to have 2 more bad coils-if youve had the engine compartment detailed and they got them wet, that'll do it. other than that it is hard to see 2 coils going at 1 time. spark plugs themselves are more likely.

May 27, 2009 | 2003 Ford Expedition

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