BAD VIBRATIONS

bcinyuz · 03-14-2001, 02:48 PM

Im having a problem with this vibration that occurs at a specific RPM. It happenes @ around 1500 and 3000 Rpms, and its not the harmonic balancer, because I just recently replaced it. So now Im getting worried that it might have tear it down and rebuild it. Please give me some good advice on what to look for, any help will do.

Ive tryed removing the serpentine belt and it still vibrated, also it doesent matter whether the clutch is engaged, the motor mounts are fine, also one more thing. when the engine is cold the vibration is less noticable then when it is hot. (thanks in advance for the advice).

[This message has been edited by bcinyuz (edited 03-14-2001).]

blueneonman1 · 03-14-2001, 03:04 PM

Hmmm...I'm kinda new to this advice thing, but you may have either a bad motormount(s) or you may have bent the driveshaft. I wont say anymore cause I dont want to give bad advice, so I'll just wait to see if others agree

dinomite · 03-14-2001, 04:53 PM

Does it occur when you just rev the engine (out of gear)? Any info you can give will help.

slider · 03-14-2001, 05:03 PM

If when you rev the engine vibrates, then i would think your fan and clutch are bad. Why dont you take a look to see if the fan spins freely and even.

In most cases the motor mounts are the ones that cause this to begin with. Look at the fan shroud and plastic fan clearance.

If this vibration only happens when driving, then you better take a look at your driveshaft (U-joints).

david

MetalMilitia · 03-15-2001, 01:59 AM

Most people wouldn't think to check the clutch, the friction disc can come apart, atleast on the 18-wheelers they do

Also check to see if the pressure plate has come apart.. how many miles are on the car, have you run anything over..? Is the dust sheild still between the trans and motor..? my .02

.dave

joe4speed · 03-15-2001, 03:48 AM

since you've checked the fan, motormounts, and it does it revving in neutral... (or does it?)
Maybe you could check the flywheel.. I have the EXACT smae thing happening with my car.. I had to replace the motor mounts because the fan was contacting the shroud, and it feels better but still does it... I'm thinking it might be the flywheel, since the first time I blew up the T-5 the mechanics did not balance it, and it kinda felt like this does, but that was much stronger.... Good luck and let us know what it is when you find it, and if I find mine, I'll let you all know!

------------------
Joe!
1988 GT, 167,000 miles!!! 13.71@105mph Check out my listing! Click here! Or my website:
www.joe4speed.com
1999 Ninja ZX-6R 10.32@135mph!
"What was the best thing before sliced bread?"

03-14-2001, 02:48 PM	#1
bcinyuz Registered Member Join Date: Aug 2000 Location: lodi,ca,usa Posts: 86	BAD VIBRATIONS Im having a problem with this vibration that occurs at a specific RPM. It happenes @ around 1500 and 3000 Rpms, and its not the harmonic balancer, because I just recently replaced it. So now Im getting worried that it might have tear it down and rebuild it. Please give me some good advice on what to look for, any help will do. Ive tryed removing the serpentine belt and it still vibrated, also it doesent matter whether the clutch is engaged, the motor mounts are fine, also one more thing. when the engine is cold the vibration is less noticable then when it is hot. (thanks in advance for the advice). [This message has been edited by bcinyuz (edited 03-14-2001).]

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03-14-2001, 03:04 PM	#2
blueneonman1 Registered Member Join Date: Mar 2001 Location: Palm Harbor, FL Posts: 208	Hmmm...I'm kinda new to this advice thing, but you may have either a bad motormount(s) or you may have bent the driveshaft. I wont say anymore cause I dont want to give bad advice, so I'll just wait to see if others agree ------------------ Blueneonman - '95 5.0L Mustang GT Convertible \| K&N Drop-in \| FMS 9mm Wires \| Hi-Flow Cats \| Flowmaster 2 Chambers \| Subframes \| 6-pt Rollcage \| 14deg Timing \| Coolest Neon Lighting on a Mustang EVER!

03-14-2001, 04:53 PM	#3
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	Does it occur when you just rev the engine (out of gear)? Any info you can give will help.

03-14-2001, 05:03 PM	#4
slider Registered Member Join Date: Mar 2001 Location: San Diego, CA, USA Posts: 86	If when you rev the engine vibrates, then i would think your fan and clutch are bad. Why dont you take a look to see if the fan spins freely and even. In most cases the motor mounts are the ones that cause this to begin with. Look at the fan shroud and plastic fan clearance. If this vibration only happens when driving, then you better take a look at your driveshaft (U-joints). david

03-15-2001, 01:59 AM	#5
MetalMilitia Registered Member Join Date: Mar 2001 Location: Orlando, FL Posts: 4	Most people wouldn't think to check the clutch, the friction disc can come apart, atleast on the 18-wheelers they do Also check to see if the pressure plate has come apart.. how many miles are on the car, have you run anything over..? Is the dust sheild still between the trans and motor..? my .02 .dave

03-15-2001, 03:48 AM	#6
joe4speed He said Member...heh, heh Join Date: Sep 1999 Location: Jupiter, Florida U.S.A. Posts: 3,718	since you've checked the fan, motormounts, and it does it revving in neutral... (or does it?) Maybe you could check the flywheel.. I have the EXACT smae thing happening with my car.. I had to replace the motor mounts because the fan was contacting the shroud, and it feels better but still does it... I'm thinking it might be the flywheel, since the first time I blew up the T-5 the mechanics did not balance it, and it kinda felt like this does, but that was much stronger.... Good luck and let us know what it is when you find it, and if I find mine, I'll let you all know! ------------------ Joe! 1988 GT, 167,000 miles!!! 13.71@105mph Check out my listing! Click here! Or my website: www.joe4speed.com 1999 Ninja ZX-6R 10.32@135mph! "What was the best thing before sliced bread?"