Working on the car, computer, or sewing machine assists children to grow in skills and independence and share in an activity that the parent enjoys. A parent's role does not necessarily begin and end with scheduled parenting time. Participating and sharing in activities allows parents to remain involved with their children. When problems arise, the first impulse may be to blame the other parent. Anger and blaming are barriers that interfere with communication.
Communication requires special skills and compromise.
When there is a problem, parents need a plan. Bringing up problems that have to do with marriage or divorce issues of the parents is not part of the business of parenting. Divorced parents may have to limit discussions to these three topics. Make a list of the issues to be discussed and your proposals. Let it sit for a few days to see if you have any changes or need more information before arranging a meeting.