What causes engine vibration?
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Old February 26th, 2009, 11:06 AM   1 links from elsewhere to this Post. Click to view. #1
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What causes engine vibration?


Guys, at low RPM my engine vibrates moderately and it seems like it stops after I get above 2100 RPM or so ...I checked my plugs and they all looked ok. Looked at the motor mounts and they checked out fine too - on top of that I have no CEL so I'm pretty much stumped. I'm workin on a 5.0 fuel injected 1968 coupe that I just got runnin...

Any input or ideas would be great
Thanks a bunch
Tony

Last edited by fatoeknee; February 26th, 2009 at 11:08 AM.
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Old February 26th, 2009, 01:01 PM   #2
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is the motor stock? Was it running ok and just started doing this?
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Old February 26th, 2009, 01:05 PM   #3
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Originally Posted by fatoeknee View Post
Guys, at low RPM my engine vibrates moderately and it seems like it stops after I get above 2100 RPM or so ...I checked my plugs and they all looked ok. Looked at the motor mounts and they checked out fine too - on top of that I have no CEL so I'm pretty much stumped. I'm workin on a 5.0 fuel injected 1968 coupe that I just got runnin...

Any input or ideas would be great
Thanks a bunch
Tony

my cars EXACTLY the same, i think mine is the harmonic balancer cuz i can see some of the rubber like coming out of it
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Old February 26th, 2009, 01:11 PM   #4
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+1 or if its a rebuilt motor with a new rotating assembly that was balanced poorly
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Old February 26th, 2009, 01:39 PM   #5
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I actually thought it could be a balance issue ...motor has been sitting for some time (probably 4 plus years) ...I'm trying so hard to remember but I think the balancer I bought for it was a new 50 oz replacement along with the flex plate for the c4 being a 50 oz replacement as well - never got them balanced to the motor though. Can a balancer go bad just sitting? LOL - i had to scrape a ton of rust off it just so I could see the timing marks to set timing.
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Old February 26th, 2009, 01:56 PM   #6
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i dont think that the balancer could go back but think of all those chmicals building or eating at the block or crank or werever, if it sat for 4 plus years u may have to rebuild it, did u do compression checks to get a idea of the shape the cylenders are in?
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Old February 26th, 2009, 03:11 PM   #7
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a stuck lifter
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Old March 2nd, 2009, 03:07 PM   #8
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Did a compression check ...all cylinders are within 130-150 suprisingly - any other ideas guys?
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Old March 3rd, 2009, 11:31 PM   #9
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If the motor is 28oz balance then it will do the same thing even with a 50oz balancer and flex plate/fly wheel. What year is the motor and if it was rebuilt what was the build balanced at? I have 28, 50 and 0 balanced 302 EFI's and carb'd and if they aren't matched you will get the same thing.
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Old March 4th, 2009, 12:04 AM   #10
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wat about ur u-joints? easy check
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Old March 4th, 2009, 12:19 AM   #11
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Originally Posted by 93hatch View Post
my cars EXACTLY the same, i think mine is the harmonic balancer cuz i can see some of the rubber like coming out of it
ya its time to change yours.. get a sealed one
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Old March 4th, 2009, 01:31 AM   #12
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Engine is a 1991 ...Today I noticed a little condensation coming out of my tailpipes on and off and now I'm wondering if that has anything to do with it - the little puffs of smoke that come out are just slightly white but don't smell like antifreeze. Makes me angry I should have bought everything new but I tried to cut corners and bought all used parts
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Old March 4th, 2009, 04:27 AM   #13
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are you letting it warm up? it could just be condensation from when you parked it.. drive it around for a lil while and does it still do it?
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Old March 4th, 2009, 09:57 AM   #14
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Still does it after it's warm
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Old March 4th, 2009, 10:23 AM   #15
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do you smell maple syrup?
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Old March 4th, 2009, 10:47 AM   #16
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1:31 AM
Originally Posted by fatoeknee View Post
Engine is a 1991 ...Today I noticed a little condensation coming out of my tailpipes on and off and now I'm wondering if that has anything to do with it - the little puffs of smoke that come out are just slightly white but don't smell like antifreeze. Makes me angry I should have bought everything new but I tried to cut corners and bought all used parts
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do you smell maple syrup?

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Old March 4th, 2009, 10:59 AM   #17
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shhh.. maybe he doesnt know that hot antifreeze smells like maple syrup lol
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Old March 4th, 2009, 11:03 AM   #18
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Originally Posted by BUGMAN View Post
If the motor is 28oz balance then it will do the same thing even with a 50oz balancer and flex plate/fly wheel. What year is the motor and if it was rebuilt what was the build balanced at? I have 28, 50 and 0 balanced 302 EFI's and carb'd and if they aren't matched you will get the same thing.
+1

check out the rubber in your balancer
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Old March 4th, 2009, 12:31 PM   #19
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vaccume leak?
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