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A v8 misfire (P0308) on a 2007 Ford Expedition EL?

My SUV shakes/"lumpy" and engine light flashes

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  • Expert
  • 75 Answers

Change spark plugsbbbbbbbbbbbb

Posted on Dec 29, 2013

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6ya6ya
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Posted on Jan 02, 2017

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

01fordeb
  • 1033 Answers

SOURCE: how to change spark plugs on a ford expedition

I recently changed them and it was a job when you have to crawl up and inside the engine area. But anyways, I started out by buying the E3 plugs, which don't have to be gapped and they do save a little gas plus increased in a little more power. (not much), These set me back $56. go with a basic motorcraft platinum or bosch platinum. I then removed the top engine cover, removed bolts for fuel rail and easily pulled the injector rail up (you will see to replace the o-rings on the injectors by some people, but if you're careful you don't have to.) This gives you the room you need at the back of the engine to remove the plugs. I started at the front by removing the small bolt holding the coil in place, then removing the the coil/wire with a boot removal tool. ( Again you don't need this tool, but it comes in handy at the back plugs). After removing the coil, I simply remove the plug, Apply anti-seize to the new one and install plug. I then apply Di-Electric grease to the inside of the coil boot to prevent moisture getting in. I then install the coil back down on the plug and tighten down and move on to the next.
1. you will need a swivel for the socket
2. you will need an extension, ( I use a long 8" extension)
3. Anti-Seize Grease
4. Di-Electric Grease
5. If installing a plug to be gapped it is .54
6. After installing, check for fuel leaks at the injectors.

It took me about 1 1/2 hours to replace all plugs and a dealer charges about $375. Good Luck if you need any further help get back to me and I'll help any I can.

Posted on Aug 17, 2010

  • 1 Answer

SOURCE: 1997 ford f150 cyliner 7 misfire

After replacing the coil, plug and wire. The injector is working properly so I would say that you have a burnt exhaust valve. Get a cylinder leak down test or compression test to confirm this at a reputable mechanic.

Posted on Mar 04, 2013

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1 Answer

2004 Ford expedition check engine soon light is flashing and car shakes hard when stepping on the accelerator


Your car is misfiring. You should not drive the vehicle while it is misfiring. If you want to DIY it you can start with you ignition system. Make sure all spark plugs, plug wires, and ignition coils are secure and in good condition.

Apr 07, 2013 | 2004 Ford Expedition

1 Answer

2007 ford expedition engine light came on and car was shaking


do you know what code is then you can tell what is wrong.

Feb 23, 2013 | 2007 Ford Expedition Eddie Bauer EL

1 Answer

Test revealed cylinder 5 is missing on my 98 expedition


You have a bad COP Ignition Coil or several

They only misfire whenever they feel like it

If you had professional software --you could road test in
Mode #06 & look at cylinder misfire counts

You need to buy a couple of coils & try in cylinder #5,
front one drivers side

If that isn't the correct one or you have several,walk the
other new coil to get to the bad ones

Disregard any other stray codes until the coil issues are
solved

If it stays on your have Class B misfire
If it flashes you have a Class A misfire that could
damage the exhaust converter

Dec 03, 2012 | Cars & Trucks

1 Answer

Electrical Problems


Your best bet is making an appointment with a mechanic. There could be any number of possibilities that might be causing all this.

Apr 22, 2012 | 2000 Ford Expedition

1 Answer

I have a 2007 ford expedition el limited 5.4liter V8 cylinder 2 wheel drive /w 120,000. my check engine light came on out of the blue about 2 weeks ago. Soon after I made sure all my fluid levels were...


Answer to question 1) Absolutely, what you are describing is exactly what you would notice and feel with a faulty c/o! Significant power loss and a shaking/vibration that feels as though it's coming from the transmission. I would venture a guess that the computer detected an engine misfire before you noticed the problem and it gave you a "heads-up" with the check engine light. I would go ahead and change all of the plugs if it's been a while and at least the c/o on these 2 specific cylinders.
Answer to question 2) Several things could cause this sound. First, and most likely with the 5.4, from what you describe you have lifter "ticking". Typical for Ford, not hating, just saying. In fact I own a 98' like yours. The other possibility is that it's an exhaust leak. You can determine which it is with a mechanics stethascope or even a short length of garden hose. With the vehicle running, take your instrument and place it very closely at one end of your valve cover and the other end to your ear and slowly move to the other end of the cover listening for the "tick". Now move to the other cover and repeat the process. If in fact this is where your sound is coming from it will be very obvious when you find it. If there is no noticeable change in the sounds at the covers then begin to inspect the exhaust system starting at the manifold coming off of the engine. Hope this info helps to solve your problem!

Apr 12, 2011 | 2007 Ford Expedition Eddie Bauer EL

1 Answer

My 2007 expendition died while driving , change fuel pump put in new fuel pump from dealer truck wont trun over when key is trun,security system light flash when key is on fast , call lock smith they put...


I had the same problem with my 2007 Ford Expedition EL Limited. The dealership suspected the heater control module on the center console is malfunctioning/tripping. They reset this by unplugging the it then re-plug after about 3 minutes.
You can do this yourself, too.
To do this, take off the bottom-most center console cover, then lift up the whole stereo cover to expose the wiring behind it. You will see the back of the heater control module with two (2) plugs (black and blue). Unplug the blue one then wait for a couple of minutes before plugging in again.
turn on the ignition and you should see the display on the dash back to normal, then start.

Feb 04, 2011 | 2007 Ford Expedition Eddie Bauer EL

2 Answers

When i press on gas peddle the truck shakes


Is the check engine light on? Could be that the engine is misfiring, or broken motor mount causing the truck to shake when you press the gas pedal.

Jan 25, 2011 | 2001 Ford Expedition

1 Answer

Check engine ligh on and then starts flashing


You are having a catastrophic misfire that will destroy the catalytic converter unless repaired soon. You may need a tune up or a 02 sensor repaiered but you will need scan tools to test what codes is being thrown.

Jun 24, 2010 | 2000 Ford Expedition

1 Answer

2007 Ford expedition won't start


ur oil pump may be failin-there r sensors everywhere on new cars-keepin u from starting as safety measure-computer systems r complex n things dont always show on 1 scan-they kinda hav the mindset of a pc

Sep 15, 2009 | 2007 Ford Expedition Eddie Bauer EL

1 Answer

2003 expedition 4.6 the engine shakes a lot, I have a problem with the missfires but even when the truck has all the power it still shakes. Can it be a mount?


If you have misfires you are not getting all the power.Get the misfires fixed before you spend on anything else.

Mar 24, 2009 | 2003 Ford Expedition

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