Welcome to Android Central, and sorry for the delayed response! Phonebook pairing can differ between vehicles. When you do the initial pairing, there should be a notification on the phone asking you for permission to transfer all contacts--do you remember seeing that? You might try unpairing the phone (deleting it from the car's memory), then starting from scratch and pairing it again. When you do, watch the phone's screen closely to see if it asks you about transferring all contacts.
Pauses are usually either a comma or a "P." Try editing the phone number in your contact to include those characters. Add more than one comma or P if you want a longer pause. For example: "888-555-1234,,2,5678#" or "888-555-1234PP2P5678#" That will dial the number 888-555-1234, wait about 4-5 seconds, then dial 2 (e.g., for a phone tree selection), wait about 2 seconds, then dial 5678 (e.g., a PIN), and then the # sign to enter.