Alright.
I think your main issue lies in the meta_key value. I sincerely hope that’s not the actual meta field name. These should only contain small letters, 0-9 and possibly _ or – for separation.
Have a look at this and see if there’s something needing change.. look at the comments I’ve put in.
<?php
$part_category = get_sub_field('part_category'); // This HAS to be a string value. Make sure that it's not an array or term object.
$args = array(
'post_type' => 'sweeps',
'posts_per_page' => -1, //fetches ALL posts without limit
'order' => 'ASC',
'orderby' => 'meta_value',
'meta_key' => 'weight_lbs',
'tax_query' => array(
array(
'taxonomy' => 'category', // If you're using a custom taxonomy this needs to be changed
'terms' => array($part_category),
'field' => 'term_id'
)
}
);
$catquery = new WP_Query($args);
?>
