Bad vibration....Need help.

[ThatOneBigKid]

So I have this stupid vibration that I can not figure out. I can drive for about 10 minutes before it starts. The car only shakes when I press the accelerator in 4th, 5th or 6th gear at 2000 rpm or higher. It doesn't shake if I'm at crusing at a constant speed or if I let off the accelerator.

Any help would be appreciated, I'm lost on this one

[Steve@Tasca]

So it would do this in fourth at 4000 rpm just the same as if you were in fourth at 2000 rpm?

[ThatOneBigKid]

Hey, as long as I am hitting the accelerator it is vibrating bad. Just drove it on lunch break and I felt a minor vibration now in 3rd gear too.

[Redlineracer12]

You could try rotating the tires if it's mainly at higher speeds.

[blcksvt2003]

Hey, as long as I am hitting the accelerator it is vibrating bad. Just drove it on lunch break and I felt a minor vibration now in 3rd gear too.

engine mounts ? idk, i had a blown passenger side and never noticed any vibrations and mine was dryyy as a bone :/

[Steve@Tasca]

What happens if you rev it in neutral?

[ThatOneBigKid]

You could try rotating the tires if it's mainly at higher speeds.

Rotated tires a week ago and the tires are only a few months old. I have rotated them ever 4000 miles. Also it only vibrates if I am accelerating. If the wheels were out of balance it would vibrate all the time.

Hey, as long as I am hitting the accelerator it is vibrating bad. Just drove it on lunch break and I felt a minor vibration now in 3rd gear too.

engine mounts ? idk, i had a blown passenger side and never noticed any vibrations and mine was dryyy as a bone :/

I thought this too but haven't been able to check them.

Steve, If I rev in neutral its no different than normal. No vibrations, noises or anything out of the normal.

[blcksvt2003]

transmission..clutch..idk im not a real mechanic

[spots25]

that's an odd one, but I'd replace the passenger side motor mount. It's $40, 15 min, and they're known to go bad and cause weird problems

[bflesher]

Mounts would be a good start, maybe the cv joints/shafts since it is under load maybe one twists or wobbles. Or maybe another front end piece is worn and allowing enough defection to cause a vibration.

[tgnorman]

that's an odd one, but I'd replace the passenger side motor mount. It's $40, 15 min, and they're known to go bad and cause weird problems

Slightly more expensive on the SVT, but definitely a good place to start.

[Steve@Tasca]

You could try rotating the tires if it's mainly at higher speeds.

Rotated tires a week ago and the tires are only a few months old. I have rotated them ever 4000 miles. Also it only vibrates if I am accelerating. If the wheels were out of balance it would vibrate all the time.

Hey, as long as I am hitting the accelerator it is vibrating bad. Just drove it on lunch break and I felt a minor vibration now in 3rd gear too.

engine mounts ? idk, i had a blown passenger side and never noticed any vibrations and mine was dryyy as a bone :/

I thought this too but haven't been able to check them.

Steve, If I rev in neutral its no different than normal. No vibrations, noises or anything out of the normal.

If it doesn't do it in neutral then it's driveline, not engine or clutch.

I'd look at wheel bearings of the right side half shaft bearing, more likely the latter.

[Steve@Tasca]

that's an odd one, but I'd replace the passenger side motor mount. It's $40, 15 min, and they're known to go bad and cause weird problems

An OEM passengers side mount for an SVT is $120.00 and I'd be shocked if there was an aftermarket copy, an OEM Zetec mount is $75.00.

Everything I've heard about aftermarket Zetec mounts says they're garbage but on the plus side you'll get REALLY good at changing that mount if you go that route.

[bflesher]

I'm not sure on the quality of the aftermarket motor mounts but from what i hear/read is if you replace them with aftermarket, and the dogbone also, you vibrate like hell. Thats with the poly ones or otherwise stiffened. That occurs at all rpm's and at idle though.

[ThatOneBigKid]

Turned out to be the CV Shaft. Just got done replacing it and it drives smooth as glass. Big thanks to Steve for the CV Shaft!

Thanks for everyone's input.