Hesitation on startup

[Mustang5L5]

I've often heard a lot of guys having this problem with their 99+'s

Once in a blue while my car will hesitate upon startup. It only does it when hot and it will just take a few extra seconds of cranking to start the engine and when it does it will stumble for a second and then run fine. Only does it once in a rare while.

Friend of mine has it happen to her car all the time. I've also read about guys having the same issues before.

So what's the fix if there is one??

 

[03ghoststang]

thats a good question that i have no answer too there has been threads on this and people will say its the IAT sensor others say something else which i cant remember...........my car does it too specially know that it is hot in but not in cold weather

 

[Mustang5L5]

Yeah i remember past threads it was discussed. I can't seem to find the right word combo to find it in a search. I know a lot of guys said it was the IAT just like to bring this up again if some guys have fixed it.

 

[Kilgore Trout]

I believe there is a TSB for the problem with difficulty starting when hot it is a known issue with no fix I think. I think I remember that if you leave the key in run for a sec to pressurize the fuel system before you turn it over it will minimize the problem.

 

[Kilgore Trout]

Oh, and I think (not sure) someone might have said a firmware upgrade helps also.

 

[03ghoststang]

I believe there is a TSB for the problem with difficulty starting when hot it is a known issue with no fix I think. I think I remember that if you leave the key in run for a sec to pressurize the fuel system before you turn it over it will minimize the problem.

i read something like that too but thats sucks that there is no fix