Question about 2003 Ford Expedition

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My 2003 ford expedition reads a code 0303= 3 cylinder misfire, which side of my vehicle would that be on and could replacing ignition coil and spark plug fix it and stop the lose of power and hesitation?

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The passanger side

4 ------------------ 8
3 -------------------- 7
2 ------------------- 6
1 -------------------- 5


front of engine



Posted on May 08, 2010

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Third cylinder back on the passenger side. I'd recommend changing all 8 coils and spark plugs. These coils don't last long, and once one goes, more will fail soon after. This job also requires removing the fuel rail to gain access to the coil and plugs. I personally have the same SUV and went through the same issue!!

Posted on May 08, 2010

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1 Answer

Po302 code also po316 code


Put the old coil back in #2 & walk the new one to another cylinder

PO Codes are wrong, as many times as correct on a ford

Forget the 316

Your best to look at fuel trim with a professional scan tool
& cylinder misfire counts in Mode #06 also

Those trucks have leaking injectors some times, but that isn't
the code your getting

Spark plugs can't be in there over 3 years

The front 2 oxygen sensors have to be replaced at 100,000 miles

Do those 2 items & then diagnose the misfire or walk the coils

Feb 12, 2013 | 2003 Ford Expedition

1 Answer

Code reads misfiring on cylinder 8. where is cylinder 8 on a 2004 ford epedition


The spark plug wires might have the numbers on them. My Freestar original wires did.

From another web page http://wiki.answers.com/Q/Where_is_cylinder_8_on_5.4L_ford_engine

Probably at the rear (closest to firewall) on the driver's side.

Could be spark plug, ignition wire or coil (or coil pack).

Sep 22, 2012 | 2004 Ford Expedition

1 Answer

My 2000 Ford Expedition 4.6l had a manifold seal blown and was leaking fluid in the sparkplug sockets. Seal replaced and spark plugs changed, now I am having to change coil packs because Im getting...


Faulty EGR valves do not cause "false" misfire codes. An EGR valve that is not closing properly can cause misfires (and misfire codes) but they are REAL misfires when this happens.

To understand this, you need to understand what a misfire is and what kinds of things can cause them. It is a very LONG list and I do not have the time or space to get into all that here.

You will also need to understand this if you are going to properly diagnose your misfire codes without wasting a whole bunch of money on parts that you do not need. MANY things can cause misfires other than spark plugs and ignition coils.

I do not know what EGR code you are getting, but I will tell you that in the 37 years that I have been diagnosing and repairing cars, there has only been once that I can remember that I have ever replaced an EGR valve on a Ford engine because the valve itself was faulty. Most EGR codes on Fords are caused by either clogged-up EGR ports or a bad DPFE sensor. Every so often you will find a bad EGR control solenoid or a broken vacuum line, but it is extremely rare that the EGR valve itself the cause. With the exception of leaking vacuum lines and on certain engines, clogged EGR ports (Like the 6 individual EGR ports in the 4.2L engine), none of these causes for EGR codes will cause any misfires.

Also, most of the time when people pull the trigger on the ignition coils on the 5.4L and 4.6L engines, all the thing really needs is new spark plug boots. They get contaminated with oil and water and can cause carbon-tracking on the spark plugs and/or arcing into the spark plug wells instead of sending the spark through the spark plug. It is pretty much the same thing as having bad spark plug wires on a conventional ignition system. You don't throw the coil and distributor away on a conventional system because it needs new wires. Neither should you replace a coil on a COP ignition system that just needs a boot. Some auto makers do not make the boots available seperate from the coil. Ford at least had the insight to understand that people cannot afford the cost of replacing all of their coils just because the boots are defective.

Mar 24, 2012 | 2000 Ford Expedition

3 Answers

My 2000 Ford Expedition Triton motor has a skip. It doesn't do it all the time. The code says #6 misfiring. Is this something we can do ourselves or do we need to take to a shop?


You obviously have access to a code scanner so there are some things you can rule out and possibly fix the concern. Number six cylinder on the Exdedition is on the drivers side of the engine, second cylinder from the front. To do a backyard diagnosis, you will need to clear the code. This is easily done by disconnecting the negative battery terminal for 5 minutes then reconnnecting (I'll explain why). Next, remove the ignition coil on the # six cylinder. It is located on top of the engine and has one connector going to it and one small bolt holding it down, and usually black in color. You are marking it so that you don't mix it up. Now remove the # five ignition coil and install it where number six was. Put the marked coil in the number five hole. Connect both connectors.

Now drive the vehicle and allow the engine lamp to come on or to skip (misfire) a few times. Scan the vehicle for codes. If the code changes to a P0305 or # five misfire, then you know the ignition coil is bad. Replace the marked coil, disconnect the battery again to clear the code, then drive the vehicle and verify the repair. Other concerns could be a spark plug, injector, base engine concern or wiring. Good luck, let me know if you need more help :o)
Coils are the most common cause of misfire, especially after rain.

Apr 16, 2011 | 2000 Ford Expedition

1 Answer

308 code i change sparks ignition coil same problem


Code P0308 - Cylinder 8 Misfire Detected

Possible Causes:
- Improper spark plug at cylinder #8
- Insufficient compression at cylinder #8
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #8
- Fuel injector #8 may be faulty

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #8
- Replaced Injector #8
- Replaced Ignition Coil #8

Jan 14, 2011 | 2000 Ford Expedition

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

1 Answer

I have a 2000 model expedition and the codes po174 and po171 are popping up, along with po301 and po306 showing misfire. How can I fix that?


P0174/0171 are bank 1-2 running lean (insufficient fuel) which is related to the misfire codes. When there is a misfire detected, the computer shuts fuel to those cylinders triggering "too lean" codes. These vehicles are known for ignition coil failures. I'd recommend you replace all ignition coils (qty of 8) as they do have a short life span. Replace with another brand (not motorcraft/Ford), such as MSD/Accell/BOSH etc. hopefully this helpd!!

Oct 06, 2010 | 1998 Ford Expedition

2 Answers

My check engine light is on and the code is reading p0304 what could be the problem


You have a Misfire at Cylinder #4 meaning:
Dirty, fouled or malfunction Spark Plug at #4 Cylinder. Remove the Spark Plug and check the igntion (spark end).
Ignition (Spark Plug) Wire malfunction for #4 Cylinder.
Misfire from the Coil/Distributor at the #4 connection from Cylinder #4.
Get a Spark Plug/Wire/Coil/Distributor tester and check the Spark Plug, Wire and Coil.
I always recommend changing everything in sets meaning: Change all Spark Plugs and Wires.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

Feb 18, 2010 | 2003 Ford Expedition

2 Answers

Engine seems to miss / sputter between 30 mph and 50 mph. Really noticeable when going uphill at any grade. 2005 ford expedition 5.4l


Hi Nascar2nd.
From what you are describing it appears like an engine misfire.
These trucks are notorious for bad ignition coils.
They don't always set a code either, it depends on several factors.
To check these out in my shop there is a mode in our scan tool called "mode 6". This allows us to look at certain engine data parameters to look at misfire to locate the offending cylinder(s).
Unfortunately without the use of a scan tool you will not be able to see this.
It may be in your best interests to get a shop to look at this for you and verify the bad cylinder.
I have had issues with aftermarket coils and use Ford originals exclusively now. They have also reduced the price of them, good thing too because we go through many.
Might be an opportune time to replace spark plugs as well. worn spark plugs can accelerate coil failure as a worn plug takes more energy to fire.
Thank you for using FixYa !

Dec 02, 2009 | 2003 Ford Expedition

1 Answer

What is the code po 0303 for a 2003 jeep grand cherokee


P0303 means misfire on number 3 cylinder. It could be a spark plug, spark plug wire, coil pack, or maybe fuel injector. What ever it is, the number 3 cylinder is the problem.

Oct 22, 2009 | 2003 Jeep Grand Cherokee

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