One problem related to engine has been reported for the 2003 Ford Thunderbird. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford Thunderbird based on all problems reported for the 2003 Thunderbird.
While driving at 55-60 mph the engine started to bog down and slowly died. Had been to dealer numerous times concerning this problem and a transmission. Vehicle had been checked diagnosticians, and was unable to find anything wrong. Dealer had never indicated what was wrong. No repairs were made other than a rebuild of the transmission when first purchased. Problem with the engine dying was intermittent. No repairs were made because they were unable to determine the cause of the problem.