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Old 03-20-2018, 09:30 AM   #1
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5.4 missfiring!

My van 2002 e250 5.4

Van has always runs super smooth. Last week I went to leave work and it stumbled on ignition and ran rough. After just just moving 5 mins earlier.

I started it again and sounded fine however my 10 min drive home I could feel a odd feeling like the engine skipped a beat a couple of times.

When I got home I put my odb reader dongle on it and used dashcommand app on my iphone to see if there are any codes.

I got cyclinder 6 missfire code and random missfire code and then a bunch of incomplete sensors.

it seems like certain rpm affect it more like cruising along at low rpm on the highway it does it. If I rev it up a bit it runs better.

Van has a little over 100thousand miles on it.

I have the van in today to get spark plugs new coils I'm hoping this will fix it.
Am I on the right track?



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Old 03-20-2018, 09:49 AM   #2
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Coils would be my first, boots, then plugs.
100k miles sounds about right for a big maintenance spending spree.
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Old 03-20-2018, 09:56 AM   #3
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Quote:
Originally Posted by Bbasso View Post
Coils would be my first, boots, then plugs.
100k miles sounds about right for a big maintenance spending spree.
Thanks thats what I was thinking . I have a upcoming van trip , crossing my fingers that is all that wrong. A complete refresh (plugs coils etc) seems like the right thing to do.
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Old 03-20-2018, 10:30 AM   #4
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I was guessing coils from the thread title.. still am.
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Old 03-20-2018, 10:44 AM   #5
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Yeah, if you're getting a hard code for cylinder-6, you have a bad coil. The rest of the random misfires are likely just consequential as the crankshaft speed bounces as the rest of the cylinders are making up the work.

The catalyst codes are also a result of the misfire....
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Old 03-20-2018, 11:01 AM   #6
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I had the same problem and it was a coil. It was running fine just prior to the misfire, but you know what the farmer said when his cow died? Damn, she never did that before...............
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Old 03-20-2018, 07:26 PM   #7
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Quote:
Originally Posted by arctictraveller View Post
I had the same problem and it was a coil. It was running fine just prior to the misfire, but you know what the farmer said when his cow died? Damn, she never did that before...............


Just got it back. All new plugs , boots and coils.
Running better than ever now
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Old 03-27-2018, 09:27 AM   #8
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Made it to Tofino bc . Surfing , baileys and coffee and hot tub time.
Van ran better than it had for a long time. I did not realize how bad it was. Engine is now smooth, quiet and powerful. (For a 5.4 pushing studded winter 265/75/16's)
Thanks for the reassurance , I was panicking a bit. I'd had a bunch of bad "luck " lately , felt like I was being punished for some reason.
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Old 03-27-2018, 04:01 PM   #9
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You can usually score OEM coils on Amazon for about half of what the dealership charges.
My 2010 has 83K on it and I'm expecting to do the full service at 100k. Fluids, coils, plugs. One thing I'm pricing out right now on Amazon is front bearings and ball joints, I've got a little play up front.
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Old 03-27-2018, 04:22 PM   #10
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Beware of knock-off parts from Amazon.... If they aren't coming from a trusted vendor (such as Ford dealer), I would treat them the same as no-names. A brief search of reviews on "Motorcraft" coils confirms folks are not getting what was advertised.
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