Bucking at low speeds?

[Dous]

Recently I have noticed something new with my 4runner. When I first start it up and get going the truck kinda bucks for a little while until I get going. It kinda feels like I am driving over a bunch of ruts, but its just smooth pavement. Once I get over 10 MPH it stops and gets smooth. Anyone have any ideas of what this could be? I am thinking its transmission related.

Thanks

 

[brian2sun]

How does the engine sound before you put it in gear, does it have a miss? Are you 5 speed or auto?

 

[Dous]

Its automatic, well when I start it up at first it runs fine, its just with I shift into gear that it starts up.

 

[brian2sun]

How does the tranny fluid look? Is it Low? Dirty? Does it smell burnt? Maybe you just need a tranny fluid/filter change or maybe even a full flush.

 

[kball]

Mine does that too. Only first thing in the morning, after sitting all night. Same for you? I'm thinking flat spots on the tires from sitting all night. Then as you get rolling it smooths back out. Kinda like old bias ply tires used to do...

 

[Dous]

Mine does that too. Only first thing in the morning, after sitting all night. Same for you? I'm thinking flat spots on the tires from sitting all night. Then as you get rolling it smooths back out. Kinda like old bias ply tires used to do...

Yea same for me, but if I leave it in a parking lot for a couple hours it dosent do it. I guess that could be it, but its kinda weird how it would just start up all of a sudden, it never did it before. Is there any reason that would happen?

Thanks

 

[kball]

Right, only when the tires are totally cold. Why it just started? Who knows. Maybe the tires are just getting older. Mine has done it since I bought it. Some day when I have money, I'll lift it and get different tires and see if it still does it.

 

[Dous]

Yea I dunno, it kinda feels like the tires have a flat spot and just as they roll it smooths out. I guess I will just have to see what happens!

:thanks:

 

[kball]

Just for a laugh if they are the same... what kind of tires do you have? I have Toyo open country h/t's

 

[Dous]

Firestone Destination A/T's I have less than 5k miles on them. But I abuse the hell out of them and have about 25% tread left!

 

[Dous]

It seems to be getting worse happens almost all the time I slow down to idle now. The engine stutters, it has trouble staying on. What could be the cause of this?

 

[piperoo]

It seems to be getting worse happens almost all the time I slow down to idle now. The engine stutters, it has trouble staying on. What could be the cause of this?

When is the last time you changed your plugs? Fuel filter?

 

[notrayray]

When is the last time you changed your plugs? Fuel filter?

x2
Cleaned your MAF?

 

[kball]

So much for the cheap easy fix... (tires) I agree, sounds like a tune up type issue.

 

[Dous]

I am changing the plugs and wires sometime next week, as for the fuel filter I dont think its ever been replaced. I will look into cleaning the MAF

Thanks

 

[Dous]

Okay so today I was doing some more trouble shooting. I put the car in neutral without the engine even on and rolled down a slight incline. The car shook like it does with the engine on. What in the world could this be? And I noticed that when it shook with the engine on the engine did not struggle to stay on, it just feels like it. It maintains its RPM just fine. Thanks

 

[cfranck1]

Okay so today I was doing some more trouble shooting. I put the car in neutral without the engine even on and rolled down a slight incline. The car shook like it does with the engine on. What in the world could this be? And I noticed that when it shook with the engine on the engine did not struggle to stay on, it just feels like it. It maintains its RPM just fine. Thanks

Did you check u joints??
Sounds like a bad Ujoint that locked up on you or a torque converter stuck on. But that would give code.

Keep us posted on what you find out
Good Luck.

 

[notrayray]

Okay so today I was doing some more trouble shooting. I put the car in neutral without the engine even on and rolled down a slight incline. The car shook like it does with the engine on. What in the world could this be? And I noticed that when it shook with the engine on the engine did not struggle to stay on, it just feels like it. It maintains its RPM just fine. Thanks

I'm thinking u-joint also. If it's that bad you should be able to lift the rear axle off the ground and turn the driveline by hand and find it.

If everything sounds/looks/feels good, jack up the front and spin the front wheels by hand.

 

[Dous]

Yea I do a fair bit of off roading so it could very well be a U-Joint I guess. And my check engine light is not on

 

[cfranck1]

Yea I do a fair bit of off roading so it could very well be a U-Joint I guess. And my check engine light is not on

If it's not a u joint, then it's gotta be drive line related. Since you rolled it down an incline without engine running and it still was doing it.

Check your diff fluids as well as transfer case.

Make sure the rear pinion nut is not coming loose on you. I sorta remember the Taco's had some sorta backing off problem with the pinion nut.