quick info, use this to know what is being return:
$loop = new WP_Query( array(
'post_type' => 'car',
'orderby' => 'title',
'order' => 'asc'
)
);
echo '<pre>';
print_r($loop);
wp_reset_postdata();
Also I believe is better at the end reset the postdata to be sure that nothing is being change in the database. For all I had read this is good to use everytime we open a new WP_Query.