I had three Mk4 Cortina’s from 1980 thru 1987 and they never ever let me down (other than a flex plate failure on one) and they were given some stick. Like Martin I own a number of different Marques Ford, Vauxhall, MG, Honda, Volvo and each has its good and bad points. If I recall correctly the Marina TC was quite a desirable car at the time being it’s the same engine as fitted to the MGB it could not have been that unreliable