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Discussion Starter · #1 · (Edited)
Hello everyone i am working with a 98 mustang w/ 3.8 v6 so here is my problem. the car is hard to start after sitting for a few hours once when started it misfires and runs rough for a few minutes then it runs fine but at the same time the cooling system is fully pressurized within 3 minutes of the car running any ideas??? ps no C.E.L and intank gasket upper and lower have been changed
 

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Even though the CEL is not lit, there still may be a trouble code. So you should scan for any codes as the first step in the diagnosis.
 

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Considering your symptoms, that would make sense. When you replace the ECT sensor, make sure to disconnect the negative battery cable for 15-20 minutes to clear the computer and force it to relearn the new idle trims.
 

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Discussion Starter · #5 ·
turns out the cooling system is pressurizing to quickly is due to a bad head gasket hopefully with the new gaskets it will fix the starting issue
 
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