Sidestepping when accelerating - Page 2 - Taurus Car Club of America : Ford Taurus Forum
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post #11 of 26 (permalink) Old 02-13-2019, 11:10 AM
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I've had the car 2 weeks, and my son took it away when he went out of town for a week, so other than 2 days driving it and 1 night under it, have not had any time to work on this.

I do have all the maintenance records for it and the Control Arms and front struts have not been changed. The steering rack and tie rods etc. have been.

With a pry bar I can shift the rear control arm bushings about 1/4" without huge effort. Both sides. I don't know if that is normal or excessive movement. The fronts do not budge. Jacked up, shaking the wheels has no effect.

The on-road movement is significant - and repeatable. My opinion is it's much more than just a slightly worn bushing.

When the car comes home, I will spend more time checking the subframe mounting and bushings as well as the rear end.
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post #12 of 26 (permalink) Old 02-14-2019, 08:39 AM Thread Starter
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Quote:
Originally Posted by Big_eddy View Post
I
The on-road movement is significant - and repeatable. My opinion is it's much more than just a slightly worn bushing.
Same here. I'm convinced it's some sort of wheel alignment change when it happens. SOmething is causing a slight change in thrust.

My pass side upper strut mount it junk. I can hear it knock around. I wonder if it's bad enough to allow for camber or caster change under load. A reduction in caster would cause the car to pull slightly to the side with increased caster. If the pass side wheel moves forward slightly under load, that would make sense.

Under hard braking i notice no change at all. I have full control and the car goes straight.

I'm also starting to notice the same affect over big roadway dips. If the suspension unloads, i feel a slight pull to one side for a split second. Again...i assume from a slight wheel angle change.

Front strut parts are in the mail, and i already have control arms. I don't think it's the arms though. I need to do the struts anyway so i'm hoping this is that.

I did change out a rear lateral link about 10K miles ago and my rear is tight. I'll check again. But since i'm FWD the rears are just coasting along and i notice a change when under power (or letting off) so i think my issue is up front.

This AM, at 60MPH i took my hands off the wheel (was on an empty highway) and gas enough gas to downshift. The front of the car shifted left slight (same feeling as if getting hit by a large gust of wind from the side) and the steering wheel went right maybe 1"on it's own. Car still went straight. I let off power and car shifted back to normal and wheel self centered. very strange.

I plan on getting under the car soon. I was actually debating grabbing my GoPro, mounting it to the fender pointed down at the wheel and doing some experiments and watching to see if the wheel is changing direction.

2014 Ford Taurus Limited 3.5L FWD
1988 Ford Mustang LX 5.0L
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post #13 of 26 (permalink) Old 02-15-2019, 03:55 PM
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I had something similar happen and it turned out out my control arm mounting bolts were loose. The procedure for tightening them says to do it under load (weight of car). The guy who did mine did it while it was up on the rack. They had worked them selves loose. Scary.
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post #14 of 26 (permalink) Old 03-02-2019, 08:13 PM Thread Starter
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Right now, I'm suspecting the rear lower control arm bushing as the culprit. I get the typical knocking in the front over slow bumps.

I have new struts and new lower control arms. I'm suspecting the control arms so as soon as the weather gets nicer, I'll swap them out.

I think it's the passenger side mostly


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post #15 of 26 (permalink) Old 03-04-2019, 08:25 AM
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I had a clicking CV axle on the right side, so replaced that over the weekend. While under there, I checked out the lower control arm, especially the rear bushings. Mine has no "sloppiness" at the rear. With a bar, I can stretch the rubber and "move" the pivot point but it re-centers immediately when the pressure is off. Initially I thought that might be the problem,but now am thinking if that was the cause, then the alignment change would be gradual - more power - more change - and less noticeable. What I get is a definite "shift" and then a definite shift back which tells me it's something different.

I had a knowledgeable Ford trained suspension tech look at it on a hoist, and he checked out both front and back and did not find any of the "usual" things wrong. He has the car again today to have another look. I want this found and fixed, but I don't want to just fire parts at it without knowing the root cause.
If you figure it out - post the solution please! I will too.
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post #16 of 26 (permalink) Old 03-08-2019, 11:29 AM Thread Starter
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Quote:
Originally Posted by Big_eddy View Post
I I don't want to just fire parts at it without knowing the root cause.
I
I don't blame you. I've seen a few other postings on FB groups about guys having similar issues, but no real cause was found yet.


Regardless. I have the parts. I have lower control arms, and new struts ready to go. All i need is warmer weather.

What i may do is try and take a video like this with my GoPro if i can figure out how to mount it securely. I feel that my pass side is worse, and when i give it gas, the car shifts left so i'm assuming the torque from the engine causes the pass wheel to shift to the left. A video of the left side bushing might help. I'll try to do this this weekend.





This one looks to be in very good shape. very little movement under load

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post #17 of 26 (permalink) Old 03-19-2019, 07:37 AM
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Replaced both front lower control arm rear bushings, and problem resolved.
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post #18 of 26 (permalink) Old 03-19-2019, 09:11 AM Thread Starter
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Originally Posted by Big_eddy View Post
Replaced both front lower control arm rear bushings, and problem resolved.
Nice, Thanks for the update.

Now i know what i need to do my next free Sat.

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post #19 of 26 (permalink) Old 04-12-2019, 08:31 AM
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So - turns out the problem is not gone. It has changed and it is not as severe as it was before - but it is certainly still there.

At 50mph on a flat straight road - I can take my hands off the wheel and if I toe in a bit on the pedal - the steering wheel will rotate ~5 degrees clockwise - the car will go straight - and when I let off, the steering wheel will center again and the car keeps going straight. Every time I power-on power-off. No hands, no change in direction traveled. It's a definite shift over and back - not a gradual shift as more or less power is applied. There is still something that must be "moving" somewhere.

I think my next step is going to have to involve a go-pro stuck to the underbody of the car.

Mustang5L5 - when you get to yours and if you solve it - be sure to post.
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post #20 of 26 (permalink) Old 04-13-2019, 03:21 PM
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Check your hubs. Mine is doing this and my right rear hub was found to definitely be bad. You can check it on the ground by grabbing the tire and trying to shake it left and right.

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