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Vibrations

Tiny
B1N8R
  • MEMBER
  • 1997 FORD E-SERIES VAN
  • V8
  • 2WD
  • AUTOMATIC
  • 60,000 MILES
After 45mph my van vibrates,
If I go down on the gas pedal it will pick up and run fine until the gear in the tranny changes and then it will vibrate again (seems like under power its fine and when the 4th or high gear selects and the van starts to cruise then the vibrations starts.
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Wednesday, February 16th, 2011 AT 5:22 PM

19 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Symptoms indicates a drive train problem the the item most likely to cause such vibrations would be the propeller shaft center support bearing.

Have it checked for damage to the bearing support and excessive side movement. Have the shaft U-joints checked as well.
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Wednesday, February 16th, 2011 AT 8:20 PM
Tiny
B1N8R
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It has no center support bearing,
can anything else cause it.
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Thursday, February 17th, 2011 AT 11:41 AM
Tiny
KHLOW2008
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Whee is the vibration most felt?

Were the engine and transmission mounts checked?
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Thursday, February 17th, 2011 AT 5:14 PM
Tiny
B1N8R
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  • 13 POSTS
Yes they were checked and the tranny mount was changed
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Saturday, February 19th, 2011 AT 2:27 AM
Tiny
KHLOW2008
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Noise and vibrations are never easy to diagnose what more without the physical vehicle. You need to try to locate the source of the vibrations and go on from there.

Does the vibrations occurs when transmission is shifted to neutral?
Is it related to engine or road speed?
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Saturday, February 19th, 2011 AT 2:52 PM
Tiny
B1N8R
  • MEMBER
  • 13 POSTS
I would say its road speed, when the van moves off and tranny changes to 45mph, the vibration starts, when you press the gas pedal the van picks up and after speed is reached and starts cruising it starts the vibration again.
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Saturday, February 19th, 2011 AT 11:27 PM
Tiny
KHLOW2008
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That can mean engine speed, road speed or drive train torsional load related and with limited information, I am sorry I don't think I can be of much assistance.
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Sunday, February 20th, 2011 AT 12:30 PM
Tiny
B1N8R
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  • 13 POSTS
What I observed is that when the van is cold it runs fine after it gets hot the vibration starts. Only after 45mph and over.
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Sunday, February 20th, 2011 AT 7:54 PM
Tiny
KHLOW2008
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Is the Check Engine Light indicating?

The additional information indicates it could be from the engine, maybe a misfiring.
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Monday, February 21st, 2011 AT 1:16 PM
Tiny
B1N8R
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The check engine light does not come on, I took it to auto zone and they put the scanner on it read the #2 cylinder I change the spark plug and the coil and it still does the same. Should I change the injector.
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Monday, February 21st, 2011 AT 5:17 PM
Tiny
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Try swapping the injector with another cylinder and see if problem migrates.

Have a compression test done to see if it is within specs.
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Monday, February 21st, 2011 AT 5:27 PM
Tiny
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The spark plug tip color is white does it means something
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Monday, February 21st, 2011 AT 5:47 PM
Tiny
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That is an indication of a lean running condition and could be the injector is not firing correctly. It could be an injector, its wiring, engine computer problem or cylinder compression fault.
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Monday, February 21st, 2011 AT 6:02 PM
Tiny
B1N8R
  • MEMBER
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I changed the injector, and its the same, only happens after reaching the operating tepm. And crosses 45mph.
Can a knock sensor cause this
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Tuesday, February 22nd, 2011 AT 1:10 PM
Tiny
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A faulty knock sensor would usually throw a code and can cause the problem. Is the Check Engine Light indicating and have you tried retrieving for trouble codes.

Have you checked the clinder compression? It coudl also be due to a faulty EGR system ( if equipped).
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Tuesday, February 22nd, 2011 AT 1:31 PM
Tiny
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The check engine light works but does not come on to indicate that there is a problem
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Tuesday, February 22nd, 2011 AT 2:15 PM
Tiny
KHLOW2008
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Get the codes read again to see if the problem is still cylinder # 2?

You have not performed a compression test yet. It could be they key to an answer.
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Tuesday, February 22nd, 2011 AT 2:28 PM
Tiny
B1N8R
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I also observe that when driving 50mph or so and shift in N and press the gas the engine runs clean and smooth but when shift back to D the hesitation starts back. If that can help any
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Wednesday, February 23rd, 2011 AT 12:26 AM
Tiny
KHLOW2008
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In N, there is no engine load so any minor misfiring would not be noticeable, especially at higher rpms.
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Wednesday, February 23rd, 2011 AT 12:11 PM

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