Excursion shaking 45-50 mph?
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Excursion shaking 45-50 mph?
Hey there. I have a 2001 5.4L excursion that intermittently shakes (feels like rumble strips/rough pavement) usually at 45-50 mph when the rpms are between 1500-2000. Increasing or decreasing rpms stopps the shaking. What could this be? I'm trying to figure out how much I might have to pay for repairs (pretty sure I'm not up to diying this one) without an expensive estimate.
Laughing Gas
Joined: Feb 2014
Posts: 965
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From: Greater Seattle area
Hey there. I have a 2001 5.4L excursion that intermittently shakes (feels like rumble strips/rough pavement) usually at 45-50 mph when the rpms are between 1500-2000. Increasing or decreasing rpms stopps the shaking. What could this be? I'm trying to figure out how much I might have to pay for repairs (pretty sure I'm not up to diying this one) without an expensive estimate.
Fleet Mechanic
Joined: Sep 2002
Posts: 1,388
Likes: 2
From: Greensboro, NC
Hey there. I have a 2001 5.4L excursion that intermittently shakes (feels like rumble strips/rough pavement) usually at 45-50 mph when the rpms are between 1500-2000. Increasing or decreasing rpms stopps the shaking. What could this be? I'm trying to figure out how much I might have to pay for repairs (pretty sure I'm not up to diying this one) without an expensive estimate.
Hotshot
Joined: Jan 2004
Posts: 19,768
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From: St Louis
Pretty typical symptom of a mild misfire.
At around 45-50 mph with the transmission having just shifted into OD places the greatest stress on the ignition system. To check, simply press the OD cancel button and rev up the engine to maintain ground speed. If it clears for the moment, it's almost always a misfire.
Once accurately diagnosed, you can usually fix it for around $50 in Motorcraft parts.
At around 45-50 mph with the transmission having just shifted into OD places the greatest stress on the ignition system. To check, simply press the OD cancel button and rev up the engine to maintain ground speed. If it clears for the moment, it's almost always a misfire.
Once accurately diagnosed, you can usually fix it for around $50 in Motorcraft parts.
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SO if I take it to a parts store and have them run a code check that should tell me if there's misfiring and which cylinder(s)? I've tried turning the overdrive off and that doesn't seem to help.
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Hotshot
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Fleet Mechanic
Joined: Sep 2002
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From: Greensboro, NC
If turning off the OD didn't change the vibration then you are back to it most likely being a balance issue. RPM's will affect the misfire - speed will be the factor with an out of balance tire. It's time to take it to a shop and let them check the balance. If the balance is ok then they should be able to run a cylinder contribution test or Mode 6 test to try and identify the offending cylinder.
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