Question about 2000 Ford Expedition

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Misfiring I have a 2000 ford expedition V8 5.4L engine. It started misting bad so i had the plups changed. It was still misting i had a diagnostic ran,it came back #3 coil pack. It is still misting i had it read again now they are sayin it is the oxygen sensor before the converter. It runs real rugged when driving it,even worse when going up hill. It losses some power when the ac is on. Can a oxygen sensor cause that much problem or could it be something else. I am putting the sensor on today.

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  • kissshar1 Aug 13, 2008

    I have a 2001 Ford Expedition 5.4 L engine with 100k miles on it. About 6 months ago it started rough running and loosing power. I was on the road Sears was the only available shop. Replaced the plugs, clean the fuel lines and repaced the fuel filter. The problem still presist? Ater a mechanic pluged into the coputer socket with a "Snap-on 50 Lug Scanner" it shows the codes PO306 and PO307 misfireing cylinders #6&7 respectively. Sugjested to replace the faulty coils? I have not done this yet.

  • chubbymoney Nov 01, 2008

    I have a 2000 ford Expedition 5.4L and I have the same problem I can step on the gas it start's to jark like it missing and the engine light come on what can I do

  • earroyo48 Jan 30, 2009

    trouble code po306



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An O2 sensor will not cause a miss, period. I would think the problem may lie with the #3 coil, or the wiring to it. What are the trouble code(s), give me those and I can be more helpful

Posted on Jul 28, 2008

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Have you ever thought about the Catalitic converters or the Pre Cats being partialy plugged? I replaced the coil Packs and it runs better but I think the Cats are plugged/precats too

Posted on Jul 10, 2012

  • chad2969
    chad2969 Jul 10, 2012

    have you ever thought about the Catalitic converters or the Pre Cats being partialy plugged? I replaced the coil Packs and it runs better but I think the Cats are plugged/precats too


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Posted on Aug 20, 2008

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Related Questions:

1 Answer

What would cause a misfire of #1 cylinder on 2000 ford expedition 5.4 liter engine?

these have a problem with coil packs and ignition wires. check the plug it may need replacing, but change all the plugs not just the one. you could have a dirty or a bad injector for that cylinder or even a vacuum leak at the intake for that cylinder. something else is you could have poor compression on that cylinder.

Aug 06, 2014 | 2000 Ford Expedition

1 Answer

Runs rough dies

change the fuel filter and check the fuel pressure

May 25, 2013 | Ford Expedition Cars & Trucks

1 Answer

Loosing fuel but not visible in my 2000 Ford Expedition, also oil gauge seems to be reading high.

Did you fix the trouble Codes? Both are fuel related. There is a test done with a special machine called a "Smoke test". This could also find out if there are holes in your fuel tank and where.

The failure of your system to maintain Vacuum pressure is a good indication the fuel system has an opening.

Apr 12, 2013 | 2000 Ford Expedition

1 Answer

2000 ford expedition blinking check engine light

What Means-the check light?

You pretty much answered your own question

Get the codes,fix what you see & then work
on any misfires,if you still have codes

May 26, 2012 | 2000 Ford Expedition

1 Answer

2000 ford expedition bucking and missing thought it had to do w/ the egr ,so changed egr and clean everything that went w it. Had a complete tune up, thought it was bad gas for a while but prob came back...

heather not sure about the other codes that it shows up but as far as the missin an rough running you said you done a complete tuneup did you change the plug boots on the coils cause moister can get in around them an cause a miss just like a bad plug wire try that an i hope it helps solve your problem

Nov 19, 2011 | 2000 Ford Expedition

2 Answers

I have a 2001 ford expodition that starts up but when you give it gas it stalls out.what all could be my problem

hello, if the check engine light is on, i would start there with a diagnostic scan to determine why it is on. The fuel pressure needs to be checked to see if it's within specs, along with the fuel pressure regulator. The TPS (throttle position sensor) will cause it to stall. Check for vacuum leaks. Check for a stuck EGR valve. These are the most common and the best place to start. Good luck, i hope this helps.

Jul 13, 2011 | 2001 Ford Expedition

1 Answer

My 2000 Ford Expedition's check engine light just

It could be as simple as a loose gas cap. The best way to find out is to check the codes stored in the PCM. The code with give you an idea what is causing the problem. If you don't have a tester to read codes you'll have to go to a repair shop, the dealer or a part store like Autozone.

Jun 19, 2011 | 2000 Ford Expedition

2 Answers

I have a 2000 expedition with a misfire prob. had it checked with a scanner and it said #3 cyl was misfiring. i changed coil pack once and it was good for about ten min and started again. i changed it a...

All you need to do, is buy one new coil,
one time at auto parts store $60.00 once

One bolt,you can install the COP Coil in
less then 30 min

You disregard the PO303 Code and walk
the new coil until you find the bad one.

You can do one or two cylinders a day,driving
at least 25 miles and getting it hot in between

Codes don't always match up to the problem cyl

When it isn't corrected put the old coil back where
it was, move the new one to the next cyl

Feb 27, 2011 | 2000 Ford Expedition

1 Answer

Recently had all plugs and EGR Valve changed.


4 - 8

3 - 7

2 - 6

1 - 5


The spark plug firing order is 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 Make sure the coil is good.

Jul 21, 2010 | 2000 Ford Expedition

1 Answer

2000 expedition 5.4 lt run fine when cold when warm misses bad anyone know whats wrong??

a very common problem for the 5.4 fords is the coil packs going bad. normally misfires once heated up and under slight load ( in overdrive going up a grade) if the check engine light is on, it can help pinpoint which cylinder is misfiring. if plugs haven't been replaced within last 50-60k miles, plan on replacing plugs, and usually the coil pack that goes bad is one of the rear ones, but impossible to tell without a scan tool. if you don't own one, take it to a shop

Feb 20, 2010 | 2000 Ford Expedition

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