4.9 hard starting when warm
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4.9 hard starting when warm
hi i have a 94 f150 4.9 5spd and it starts fine when cold but if i drive for awhile and it gets up to operating temperature and i shut it off it takes a lot of cranking to get it to start... any ideas what this might be?
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From: Muskegon, MI (home)
When it does start, does it lope or idle rough? Does it do this all the time? Is the "check engine" light on? If it does start hard next time try tapping on the IAC (idle air control) valve, see if that helps. The IAC may be going bad.
John
John
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it will sputter for awhile until i tap the gas a bit and then it idles fine and no the check engine light is not on
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hmm ill hafta try tapping on the iac then
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From: Muskegon, MI (home)
You could try that, and if that doesn't work... try taking it off and cleaning it. It's most likely carboned up inside causing the valve to stick, I'd try using carb cleaner or better yet Sea Foam.
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Ok I will do that tonight then
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. Thank you so much for the tips it is greatly appreciated.
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Idk about price but it's right on top of the intake and looks like a cylinder with wires coming out towards the drive side.. That's on my 94 I'd assume it the same for your 96 but not positive it has 2 bolts one on each side. 1/4 if I remember right
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From: MA
I know this thread is old but I came across it searching because my 1992 F150 4.9 E4OD has been doing the same thing for awhile. So yesterday I went and bought a new IAC and put it in now since its winter I wont find out until the warmer weather. But now when I put the truck in drive it idles up more than it used to and then idles back down. The old IAC defiantly had carbon in it the inside of it was total black. I rechecked everything gasket is seated right I don't believe theirs any leaks. No CEL is on either. It has gotten alittle better but it still does it. Does it take so many start cycles for the computer to re learn the new IAC? Thanks