Car vibrating like crazy
Joined: Aug 2012
Posts: 8,756
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So it vibrates even at a stop, right? If engine running, it vibrates, rolling or not, yes?
So as was mentioned it could be motor OR trans mounts. Obviously can't be diff mounts or other drivetrain issues (can't be wheel balance, driveshaft, hubs, etc).
No power loss so not likely a misfire (if misfire bad enough to cause vibrations described you'd expect loss of power or a cel or both.)
What about engine accessories? Serpintine belt driven, AC condensor, water pump, idler pully, tensioner? Try removing belt from tensioner, and start motor for a few sec. Should be able to rule out accessories with about 15 min of work.
So as was mentioned it could be motor OR trans mounts. Obviously can't be diff mounts or other drivetrain issues (can't be wheel balance, driveshaft, hubs, etc).
No power loss so not likely a misfire (if misfire bad enough to cause vibrations described you'd expect loss of power or a cel or both.)
What about engine accessories? Serpintine belt driven, AC condensor, water pump, idler pully, tensioner? Try removing belt from tensioner, and start motor for a few sec. Should be able to rule out accessories with about 15 min of work.
Joined: Nov 2012
Posts: 1,310
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From: Kitchener, ON
Symptoms
They symptoms don't really add up but if they're accurate, it points to something mechanical that's rotating and affecting the efficiency of the engine.
- Vibration worse at idle than under load. (Under load the motor has more vibration isolation)
- Vibration unchanged when clutch pedal is depressed. (Rules out drive line and clutch disc)
- Vibration amplitude and frequency increases with rpm. (Something rotating causing an unbalance)
- Decreased fuel mileage. (Bad motor mount "shouldn't" cause this)
- No non pending DTC.
They symptoms don't really add up but if they're accurate, it points to something mechanical that's rotating and affecting the efficiency of the engine.
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Joined: Jul 2002
Posts: 22,386
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From: Long Island, New York
I've seen many broken motor mounts, they never caused vibration.
Does anything change with the car in first gear, not moving, clutch in? (this takes the trans input shaft and disc out of the equation)
Does anything change with the car in first gear, not moving, clutch in? (this takes the trans input shaft and disc out of the equation)
Joined: Jul 2013
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This is tricky to diagnose, it could be a lot of things, could be valve adjustment related, the crank pully. Could be something silly like a bad PCV valve, or sputtering fuel injectors that flow normally under load but dribble gas at idle, could be MAP related or a clogged throttle body, or dirty IAC valve, it might be a combination of things.
Joined: Oct 2007
Posts: 9,708
Likes: 2
From: Porter Ranch, CA
Updates? I think we have the same issue. Unfortunately, I have been busy and haven't had the time to get a second opinion on mine.
https://www.s2ki.com/s2000/topic/107...a-certain-rpm/
https://www.s2ki.com/s2000/topic/107...a-certain-rpm/
Joined: Oct 2009
Posts: 29,888
Likes: 5,429
From: Ontario Canada
Updates? I think we have the same issue. Unfortunately, I have been busy and haven't had the time to get a second opinion on mine.
https://www.s2ki.com/s2000/topic/107...a-certain-rpm/
https://www.s2ki.com/s2000/topic/107...a-certain-rpm/
Joined: Oct 2007
Posts: 9,708
Likes: 2
From: Porter Ranch, CA
Originally Posted by vstypicals' timestamp='1409766085' post='23314157
Updates? I think we have the same issue. Unfortunately, I have been busy and haven't had the time to get a second opinion on mine.
https://www.s2ki.com/s2000/topic/107...a-certain-rpm/
https://www.s2ki.com/s2000/topic/107...a-certain-rpm/
Thanks!
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smartson
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Apr 18, 2005 12:00 PM