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Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be posting a reply ASAP
v8 4.6 or 5.4 liter 4wd or 2wd ?
you codes been checked, so none exist but does the check engine light on or flashes when it miss ?
what is the mileage on it ?
coolant pressure been done
how much water we talking you have to add here 1 gallon 1/2 gallon and what is the time in between top off?
Please let me know
ASE Certified Technician
ok great thanks
if you put your hand close to the tail pipe tip and watch if there is any coolant smell on your hand ?
the coolant must evaporating and it is coming from tailpipe as steam, but usually you can smell it on your hand did you check that .
what was compression check ?
coolant pressure tester installed and checked for leaks ?
radiator , head assembly where it meets the block, freeze plugs etc.. ?
is the radiator fan running ?
any pressure build up in water hoses or coolant jug ?
are you losing oil or water ?
let me just double check so we on same page ?
i m going open up the question for another expert maybe they can help
Hi there. Different expert here.
The only thing that would explain the cooling system losing 1/2 gl per day and an engine misfire would be a crack in the combustion chamber that only manifests itself once the engine warms up.
Were this my car, I would try a chemical sealer like Blue Devil (click here to view - just make sure the instructions are followed exactly as shown on the container).