[harmor19]

You don't need to put the query into a variable then the variable into a method.
You can just use $db->query_write()
Example:

PHP Code:

$db->query_write("DELETE FROM " . TABLE_PREFIX . "temp_host_request WHERE userid = '".$db->escape_string($vbulletin->GPC['postuserid'])."' "); 


The syntax is "DELETE FROM [table]". You don't list the fields.