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Shaking

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Old 11-24-2015, 03:19 PM
Wes Shaver Wes Shaver is offline
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Shaking

Have a 2004 Fx4. Lately its been shaking violently when i accelerate. when i turn the overdrive off it stops. Any thoughts?
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Old 11-24-2015, 03:53 PM
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07F150Lariat5.4 07F150Lariat5.4 is offline
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Mine did the same thing and ended up being the spark plugs misfiring. Have the plugs been changed?
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Old 11-24-2015, 04:05 PM
Wes Shaver Wes Shaver is offline
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Not yet. That was the first step I was going to take. Why would it only shake when overdrive is on?
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Old 11-24-2015, 06:41 PM
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Failing plugs usually will misfire when under load only. Does it get worse as you hit a hill? Mine shook like crazy in O/D going up hills at 45-50 MPH and when I took it out of O/D to take low RPM load off of the engine, it cleared up right away. I can almost guarantee your issue is the same one I had. I replaced my spark plugs and it hasn't happened since. That was 44,000 miles ago.

One thing I want to mention; If you're not familiar with the spark plug design on these year 5.4s. These are not your regular spark plugs. They have a 2 piece design and the bottom piece of the plug is a porcelain shell that can break off in the head during removal due to carbon seizing it into the well. There is an extractor tool by Lisle part #65600 to extract the shell. There are some good videos on YouTube showing proper procedure for spark plug removal, shell extraction with the Lisle tool, etc. I also recommend running a few tanks of Chevron Techron before tackling this job, which will help to break loose the carbon from the porcelain shell.
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Old 11-25-2015, 02:56 PM
Wes Shaver Wes Shaver is offline
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It does get worse going uphill. In fact it starts to shake on the exact same spots on my way home which are hills. Thanks a bunch for the input!
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Old 11-25-2015, 10:25 PM
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No problem! Hopefully should fix your issue. Pretty confident it will.
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Old 11-25-2015, 10:54 PM
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I had the exact problem a few months ago. Changed the plugs and all has been well for 4,000 miles. I used original motorcraft plugs as i read here that after market plugs xometimes failed...good luck.
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Old 11-27-2015, 12:58 AM
sccowboy sccowboy is offline
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Yep, plugs should clear you right up. I bet if you hooked up an obd reader and observed misfires, you'll see the counts increase as it shakes. Plug change out is a piece of cake just take your time and keep the beer cold and plentiful!
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Old 11-27-2015, 10:42 PM
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Would this throw a code? My is doing the same thing but doesn't show problem codes. I cleaned throttle body and MAF, changed fuel filter, cleaned air filter, etc. and it still shudders under acceleration.
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Old 11-28-2015, 10:03 PM
sccowboy sccowboy is offline
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Not necessarily. You may see Misfires on your scanner. The plug change isn't the nightmareiit's made out to be.
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