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-   -   Engine Shake (http://www.focusfanatics.com/forum/showthread.php?t=302264)

YesMAN 11-14-2012 12:39 PM

Engine Shake
 
Anyone have an engine shake around 1,800 to 2,000 rpms? At first I thought it was tire related but when stopped I popped it into neutral and revved it up and sure enough there's a rough high frequency vibration in that range and a low frequency vibration (resonance?) right at about 1900. I'd estimate it's in the 300 to 400 rpm range.

dutd33 11-14-2012 01:44 PM

Quote:

Originally Posted by YesMAN (Post 4455411)
Anyone have an engine shake around 1,800 to 2,000 rpms? At first I thought it was tire related but when stopped I popped it into neutral and revved it up and sure enough there's a rough high frequency vibration in that range and a low frequency vibration (resonance?) right at about 1900. I'd estimate it's in the 300 to 400 rpm range.

Yeah I've noticed that there's a bit more vibration around that RPM range, especially when I go from 4th to 3rd gear. I thought this was normal was a part of the "European flavour" of the car.

Bear in mind it's not violent shaking or something.

cbdallas 11-14-2012 02:08 PM

I haven't really noticed it in this car, but it was a characteristic of one of my past cars....a 2004 Mazda 3 2.0. Right before 2,000 RPM, it had a 'shake' that didn't appear anywhere else in the rev range. I wrote it off as a balance issue, which it probably is. If it was an actual mechanical issue (misfire, etc) that was strong enough to shake the engine, the ECU would've picked it up and given you a check engine light. I woudn't worry about it if I were you.

FordService 11-15-2012 10:08 AM

Quote:

Originally Posted by YesMAN (Post 4455411)
Anyone have an engine shake around 1,800 to 2,000 rpms? At first I thought it was tire related but when stopped I popped it into neutral and revved it up and sure enough there's a rough high frequency vibration in that range and a low frequency vibration (resonance?) right at about 1900. I'd estimate it's in the 300 to 400 rpm range.

Hi YesMAN,

If you're concerned, you can always have your dealer check it out the next time you have an oil change or other scheduled maintenance visit. They'll be able to diagnose it or give you some peace of mind. Worth the trip, I'd say. [8D]

Quote:

Originally Posted by dutd33 (Post 4455493)
Yeah I've noticed that there's a bit more vibration around that RPM range, especially when I go from 4th to 3rd gear. I thought this was normal was a part of the "European flavour" of the car.

Bear in mind it's not violent shaking or something.

Quote:

Originally Posted by cbdallas (Post 4455530)
I haven't really noticed it in this car, but it was a characteristic of one of my past cars....a 2004 Mazda 3 2.0. Right before 2,000 RPM, it had a 'shake' that didn't appear anywhere else in the rev range. I wrote it off as a balance issue, which it probably is. If it was an actual mechanical issue (misfire, etc) that was strong enough to shake the engine, the ECU would've picked it up and given you a check engine light. I woudn't worry about it if I were you.

Thanks for sharing your experiences, dutd33 and cbdallas. Great info, and I'm sure YesMAN appreciates it.

Feel free to shoot me a PM if you have any other questions,
Crystal

Brabs_Weather 11-15-2012 11:01 AM

I had a the vibration or rattle sound 1st-2nd 3rd-4th, but not so much any more. It was very annoying sounded like a metal shroud rattling. So the other day I removed the resonator tube from under the AirBox and the noise was gone. I reinstall and hit it and sure enough it was vibrating against the sub-frame. Put some foams in between and eliminated the rattle. There is another somewhere but i think it is the heat shroud under the catalytic converter. Gonna add some sound damning material to that soon.

YesMAN 11-16-2012 08:46 AM

Quote:

Originally Posted by Brabs_Weather (Post 4456903)
I had a the vibration or rattle sound 1st-2nd 3rd-4th, but not so much any more. It was very annoying sounded like a metal shroud rattling. So the other day I removed the resonator tube from under the AirBox and the noise was gone. I reinstall and hit it and sure enough it was vibrating against the sub-frame. Put some foams in between and eliminated the rattle. There is another somewhere but i think it is the heat shroud under the catalytic converter. Gonna add some sound damning material to that soon.

Mine isn't a rattle at all but rather a low frequency vibration through the pedals at around 1900 engine rpm. Just dropped it off at the dealer and the advisor said something about engine mount equalization. I'll post what they say at the end of the day.

powermax 11-18-2012 09:42 PM

Did anyone get rid of the vibration coming from the under the hood?

dwardo 12-05-2012 04:19 PM

Yes, I started a thread about that when I first got my car. Mine is a vibration that starts about 2100 and goes to about 2500. It seems like an exhaust resonation. I find it unacceptable and frustrating but of course the dealer tells me that it is "normal". I would find it marginally acceptable on a four-cylinder motorcycle. I do not find it acceptable in a car. Did you get a resolution for it?

powermax 12-05-2012 09:20 PM

Quote:

Originally Posted by dwardo (Post 4485279)
Yes, I started a thread about that when I first got my car. Mine is a vibration that starts about 2100 and goes to about 2500. It seems like an exhaust resonation. I find it unacceptable and frustrating but of course the dealer tells me that it is "normal". I would find it marginally acceptable on a four-cylinder motorcycle. I do not find it acceptable in a car. Did you get a resolution for it?

Nope, drove another one it does the same thing.

dwardo 12-12-2012 10:16 AM

Thanks. That's discouraging. I'm going to get underneath and have a look. It's nothing I can't get used to but I don't like it.


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