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They lock up.
For some reason, these fuel injector cleaning places cannot source out a cleaner / lubricant chemical that allows for really long shelf times after the initial cleaning.
Luckily, we have a pro fuel injectors shop down here in Hawaii.
We they first opened, no one knew of this problem.
We ran several sets through them, and we had problems with the fuel injectors not opening at all after sitting around for several weeks.
Their initial cleaner had a shelf life of about 2 weeks.
They started to change the cleaner chemicals, and now we've got a 30 day window - same like yours.
Because of this, we tend to take care of the fuel injector cleaning at the last minutes just to avoid this.
-Ted
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