When I am smoking ribs I wrap after 3 hours, and leave them wrapped for about 1.5hrs, the place them back on the smoker unfoiled for about 30 to 45 minutes.
Next time you smoke some ribs try the 3, 2, 1, method. It is simple to follow, and you can adjust the times if you want.
Rules to the 3, 2, 1 Method:
3. Let the ribs smoke at 225° to 250° for 3 hours.
(Why 3 hours? Because the ribs will not take anymore smoke after this time, and too long in smoke, your food will go from a sweet tasting to bitter.
2. After 3 hours of smoke, wrap your ribs in foil, make sure you add some kind of liquid to the ribs. I.E.: Cola, Apple Juice, Apple Cider, Beer, or just Water. I use a mixture of Dry and wet ingredients. I sprinkle on the top of the ribs brown sugar, honey, squeeze butter, then I add apple juice to the side, maybe 2 to 3 ounces. After you have all this done and wrapped place back on the smoker for no more than 2 hours. I normally go for like a hour and a half.
1. You have come to the final stage now of the 3,2,1 Method. What you are going to want to do is take the foiled ribs unwrap them and place them back on the smoker for up to another hour. This is to allow the ribs to tighten back up. Increase the temp of your pit slightly, I will normally go up to about 300° or so. What is going on in this stage is when you had you ribs in the foil, they were getting steamed to break down the tissues to make them tender. Now you want to tighten them back up so they don't fall apart so much. (You want to keep your ribs like this for no more than an hour. Like I stated before all time can be adjusted to climate and barometric pressure(where you are at sealevel.)) This is also the time to add your sauce if you want to. Baste on your sauce to one side let that go for like 10 minutes or so, when it starts to caramelize, turn the ribs over and repeat the process. If you have a good rub on your ribs you won't need a sauce. I server my ribs with no sauce, just rub. People appreciate the chance to add the sauce themselves. Some don't like sauce, and I would advise you to try your ribs without sauce and see, it may surprise you.
Hope this helps you out.