vibration uncer acceleration, what do you think?

I just bought my first Honda 3 days ago.  It should be in the signature, but it's a 99 Accord V6 coupe.  It's great, except there is some slight vibration under acceleration only.  When I am at the same speed (like using cruise control), the vibration doesn't exist.  I feel it more in the seat than the steering wheel and it's more notciable on the driver's side.  I hope it's not the transmission!  It's not awful, but certainly noticeable. 
 
Any clues?  Do you need any more information from me?
 
I'm glad to have found this site!  After years of owning GM's from the eighties, I'm happy to finally own something respectable and hopefully dependable. 
 
Thank you!
 
 

I have the same problem, Check you tie rod ends, Maybe a balled tire on one side. If you need an alignment, it may also vibrate.

A vibration on accel is almost always a bad inner c/v joint. Make sure none of the suspension is loose.

Thank you for your input.  I spent ALL of my money for this car... paid cash.  It's the most expensive thing I've ever bought so a transmission issue would be devastating.  CV joints and other smaller stuff are a little easier to swallow!  I'm going to have it diagnosed by the dealer in a week or so. 

quote:

ORIGINAL: Chiovnidca

A vibration on accel is almost always a bad inner c/v joint. Make sure none of the suspension is loose.

this isnt true at all, but could be likely. motor mounts or transmission mounts could also be a more likely coulprit. most transmission shops look at everything to determine the likely cause. a shop near me looked at it and road tested it for free and thought my front motor mount looked bad. once its installed, ill let you guys know whats causing my vibration on accel.

quote:

ORIGINAL: Velocifero


this isnt true at all, but could be likely.

No possibility at all but it's still likely huh??? heeeeee

quote:

ORIGINAL: Velocifero

quote:

ORIGINAL: Chiovnidca

A vibration on accel is almost always a bad inner c/v joint. Make sure none of the suspension is loose.

this isnt true at all, but could be likely. motor mounts or transmission mounts could also be a more likely coulprit.

I beg to differ.Velo   .and i have to agree with Chio ..90% of the times if not more i have found  to be a bad or a lack of greased inner cv joint when shaking under accell and felt under the seat //////

I would remove the inner cv boots and make sure that there is planty of grease in the inner cv joints,, if not, pack them with grease and road test the car

Uh oh. Something hit me like a ton of bricks just now. My vibration began immediately after changing the passenger axle. After the first road test, i noticed vibration and assumed it was a faulty axle. Had a new one sent, changed it and same thing happened so i figured it wasnt the axle even though it seemed obvious.

Now when you guys mean lube the inner joint, are you referring to the inner spline shaft that goes into the transmission? I wasnt sure if the Haynes said to lube that area or not, but when i removed the old axle, there was no grease at all there so i thought none should be reapplied on the new one. I found only transmission oil on the spline so i figured grease shouldnt be mixed with tranny oil.

1. Should i have lubed the crap out of that inner spline shaft on the passenger side?

2. Should i have lubed the inner spline shaft on the drivers side even though it doesnt go into the transmission?

*edit* and 3. If 1 and 2 are true, is there any damage i should be worried about? it's been going on for about a month.

Well the haynes manual say's to grease both splines, I just did the driver's CV a few hours ago. I bought the axle and it omes ready to go, and is packed with grease. I can't say that all do, but mine did, I just greased the spline like the manual says and put it in. 

I think what Desert is saying is plenty of grease inside the rubber boot of the inboard CV joint.
 

Ok vibration only when accelerating as described is A bad egr valve. I do about 3 a week. The v-6's are well known for that.
 
a honda factory tech can easily confirm this by driving it with a honda HDS tester.
 
 
Axles can also be the problem. Ive put brand new honda axles in a accord once for leaky/ dry joints. After driving the car with the new axles i had this awful vibration when getting on the gas. After replacing the axles again it was corrected. This has happened 3 different times last year.
 
good luck

quote:

ORIGINAL: J5sense

Ok vibration only when accelerating as described is A bad egr valve. I do about 3 a week. The v-6's are well known for that.

a honda factory tech can easily confirm this by driving it with a honda HDS tester.


Axles can also be the problem. Ive put brand new honda axles in a accord once for leaky/ dry joints. After driving the car with the new axles i had this awful vibration when getting on the gas. After replacing the axles again it was corrected. This has happened 3 different times last year.

good luck

Bad EGR? Dunno if that is a problem for h22s or not. I did replace the passenger axle twice, but it's unlikely the axle itself. A transmission shop looked over the car and road tested it and his reccommendation was to replace the front engine mount, which looked sort of funny; looked like metal on metal action.

SB# 99-085 egr port clogging. A bad egr valve causes a shaking when in overdrive crusing and then lightly accelerate, if there is a "shaking or vibration" a egr MAY be the issue.
 
honda covers this for 8 years 80,000 miles on certain  v6 accords pilots and vans

That could be the case for the original poster, but i dont have a V6 or an automatic.

oh yes, thats what i was referring to, sorry for the confusion.

quote:

ORIGINAL: J5sense

SB# 99-085 egr port clogging. A bad egr valve causes a shaking when in overdrive crusing and then lightly accelerate, if there is a "shaking or vibration" a egr MAY be the issue.

honda covers this for 8 years 80,000 miles on certain  v6 accords pilots and vans

every single one of those that i have seen has had a chk engine lite on ,,,  code p0401  insuff egr flow ...

Ive had a few that just had a bad egr only with no check engine light. sorry 99-085 is a bad example, 04-029 is a much better example. im sure you have done quite a few of those

the computer on your j30 is simply brilliant at knowing when your egr port gets clogged. which is a common problem. Even then! your egr valve is not bad so dont replace it. a larger line needs to be installed to the manifold and the hole in the manifold needs to be made larger.
desert knows what he is talking about.

Just wanted to let you all know that I had the car looked at today.  It is both CV axles.  Price to get fixed will be 438.00 dollars!  I guess that's better than a transmission and I'm glad that I know! 

Thanks again.