Bad stitching I am a relatively new quilter. When I try to do a meandering stitch, with the feeder down, it pulls on the under stitching. It didn't used to. I have threaded, changed the needle, adjusted the tension. Nothing works. Also, when I just stitch, the under doesn't stitch right. It is just a line with hoops holding it which I can pull out and there goes the sewing. What is wrong??

Can I Free Motion Quilt on a Regular Sewing Machine? By National Quilters Circle

Yes

https://www.nationalquilterscircle.com/article/can-i-free-motion-quilt-on-a-regular-sewing-machine/

How to Stitch the Perfect Stitch Length for Quilting
JULY 28, 2020
Today’s Topic: How to Stitch the Perfect Stitch Length for Quilting

https://lorikennedyquilts.com/how-to-stitch-the-perfect-stitch-length-for-quilting/

There are a few possible reasons why your Simplicity American Quilter SA2400LX is only stitching straight:

1. Stitch length setting: Check that the stitch length setting is not set to zero or a very small number. If it is, the machine will only sew straight stitches.
2. Stitch selector mechanism: It's possible that there is a problem with the stitch selector mechanism that is preventing it from engaging properly. You may need to take it to a repair technician to have this checked and fixed.
3. Tension setting: Make sure that the tension setting is correct for the type of stitch you are trying to sew. If the tension is too high, it can cause the machine to only sew straight stitches.
4. Timing: The timing of the machine may be off, which can cause the machine to not properly engage the stitch selector mechanism. This is a more complicated issue and may require professional repair.

If you are comfortable with sewing machine repairs and want to try to fix it yourself, start with checking the stitch length and tension settings. If those are not the issue, it may be best to take it to a repair technician for further diagnosis and repair.

it's possible that the feed dogs need a adjustment or they need to be
timed by a sewing machine repair technican

I agree to have the regulator check, & even having the whole machine checked wouldn't hurt.

Try straight stitching on the left side and then on the right side of the foot. If it doesn't give a stitch on the left it is a sure sign that it needs to be timed.

you might think about having the machine check to see if there is something wrong with the motherboard

Is the darning foot aftermarket or genuine darning foot for your particular model...If it is aftermarket, it may not be the correct length. What is you model?

I haven't been able to find a 6003 manual or a good image of the stitch range for this machine on line. However, a basting stitch might look like " . _____ . _____. " on your stitch selector. As your machine is targeted for quilters I'd have expected it to have a basting stitch in its range.

If there is nothing like that, then just dial up the longest possible straight stitch, ie take length up to 4 or 5, whatever the maximum number is. Then loosen off the top and bottom tensions and stitch away.

If you are using this to baste a quilt top, botton and batting together, I've discovered a product called "spray basting" which is fantastic and "glues" the layers together while you sew them. You need a big clear floorspace though and put paper down under the project. But it works great.

Trust this is of help to you.

Hm, wondering if it could be the presser foot pressure setting. Most machines have this capability where the amount of pressure applied to the feed dogs can be increased or decreased. You might check your owner's manual,.

Try lengthening your stitches on your stitch guide, it could be trying to stitch too tightly together & not stitching 'forward'....