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Temp. sensor fault.
The temp gauge is sitting very low even though the car is warm and done some miles.
Starts fine when cold but will start to "splutter and hesitate" once she gets warmer.
Plugs, leads and distributor checked.
Timed on marks as manual when pump and belt changed.
The car is not mine and I am not sure if the "miss" was there before the water pump went!
Hope this is of some use to your diagnosis and you can confirm mine!
Have fitted a new temp. sensor and it is now as it should be.
Guage reading half way and the fan coming on.
Car running almost perfect except for a slight hesitation.
Will change plugs and clean trottle body with carb. cleaner and hopefully all will be 100%.
Anything else you can suggest!!!!!!!