Frontend vibration... Kinda like wheel hop

[99SilverSE]

If i'm at a stop and push the gas a little too fast on the greenlight I get some major vibration/jumping untill I let off the gas and then it's ok.

What do I need to check?

[GoldenBullet]

motor mounts may be a culprit

[99SilverSE]

I think I need those too, I've been hearing a weird grumbling noise when I first start moving and under a load.

[1fatcat]

You might have a sprag going out in the tranny? I'm pretty sure mine is and it is doing the same thing as yours. I can never find the time to pull the tranny and replace it but I have been driving it for a very long time in this condition. I just make sure not to get on the gas hard until after 5 mph. It might be a pressure control solenoid, but I think it's a sprag? (in my car)

[1fatcat]

I should add that I am taking a big chance by not fixing it right away. It could result in greater damage down the road...litterally, like scattered down the road right behind my car :(

[i<3bonbons]

My last car did that, if you hammer the gas from a stop, it vibrates like a bitch, but if you get it rolling just a bit, you can put the pedal through the floor and get it to engage without problems. I never figured out the problem, but I put 70k km's on it, and it never gave up.It has to be something in the trans.

[99SilverSE]

Oh great! It's been doing this since I bought it 2 years ago. Though it seems like it went away for a while after I got my wheelbarring changed (JUST THOUGHT ABOUT THAT) but now it's back again. Maybe I need to check the barrings again?

[myfirstbonnie]

Check the dog bone under the right side of the engine. It connects from the subframe to the diff cover on the transmission.



The grizz had a similar issue here in this link:

viewtopic.php?f=19&t=7030&hilit=grizz

and Paul fixed it here:

viewtopic.php?f=19&t=10080&p=107029&hilit=grizz#p107029

[LeSabre in Buffalo]

My car is doing the same thing. It's sort of speed-dependent. When flooring it from a stop, it really shakes. Flooring it with the car slightly moving makes it shake less.

Eh, looks like a new dogbone mount (or "torque strut mount-engine") at AutoZone is $22. I may be replacing it this weekend.

99Silver, it could be that the mount wears out as it ages. I notice our cars are both 1999 L36-powered base models. With identical problems.

Looking in my factory service manuals, it says that faulty mounts are very likely responsible for what they term "launch shudder".