I have used the manual Jonah mentioned above. I have found others on the internet that are very good as well.
http://www.catholicapologetics.info/thechurch/sacraments/adults.htm This one is very detailed.
I have found that the most detailed one of all on the net is this one. http://www.trosch.org/chu/examcons.html#02 I'm not sure if the priest who compiled it is correct on everything. For instance the section on abstaining from marital relations during a certain time of of woman's cycle. I'm certain that St. Thomas said regarding this issue that if a husband asks for his marital rights during this time, the wife is bound to oblige. Other than that it's a really good examination of conscience. Also there have been criticisms about some of the positions this priest held (he's deceased). He maintained that it was justifiable homicide to kill abortion providers.
Please forgive me for having provided the above two links. Both of those sites contain information that is way too problematical. I should have been more prudent and looked both over a lot more carefully before posting the links. I still highly recommend Rev. Donald F. Miller, C.SS.R's examination of conscience for adults because it is one of the most through and detailed ones I have ever found. However, we don't need catholicapologetics.info. Just type fathers name in the search bar and and you'll be able to find a copy of it.
Even though catholicapologetics.info contains a lot information that is very valuable, there are many articles on this website that are very dangerous and misleading. Particularly the sections that deal with the Second Vatican Council, the new Mass, EWTN, Opus Dei and the New Rite of Ordination. One must keep in mind that these articles, even if written by members of the clergy, are expressing their own private opinions and interpretations and as such are not binding on anyone. My biggest concern is the scandal these articles may cause some, particularly those who are new to the faith, considering converting to the faith or are highly impressionable. In a saner age, some of these articles most likely would have been placed on the index of prohibited books. As a result, some people may very well erroneously come to the conclusion that the visible Church established by Christ which is situated in Rome, has lost the faith and that many will abandon the Church. The very Church outside of which there is no salvation.
The second link for Fr. David Trosch's examination of conscience no longer works. THANK GOD!!! Even though his examination of conscience was very through, it did contain at least one error which I pointed out. I extremely embarrassed now that I even posted a link to anything written by him. The man promoted so many weird beliefs and frankly sinful accusations against even the popes, it's not funny. Here is just a small sample:
http://saint-mike.org/hallshame/8Father David Trosch is inducted into our Hall of Shame due to his rebellion against the Church and causing scandal among the Faithful.
Father Trosch is a Roman Catholic priest who disagrees with most bishops and priests. Archbishop Oscar H. Lipscomb has removed his faculties to act publicly in the name of the Church.
Father Trosch’s website sports topics such as:
Bent Cross
inverted Cross
Paul VI a satanist
John Paul II a murderer
John XXIII, 33rd Degree Mason
crafty LEGAL pope, but not moral pope
Once again my deepest apologies.