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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 12-15-2010, 07:46 PM
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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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Old 12-15-2010, 10:20 PM
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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
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1977 Ford F250 XLT Ranger 4wd/ 351m/ NP435/ 205
1979 Ford Bronco XLT Ranger/ 460/ C6/ 205
1984 Ford F250 XL 4wd/ 6.9 IDI/ C6/ BW1345
1984 Ford F150 4wd/ 300/ NP435/ 208
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Old 12-15-2010, 10:30 PM
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Quote:
Originally Posted by Pkupman82 View Post
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
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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Old 12-15-2010, 11:06 PM
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My 96 F150 with the 300 I6 did the same thing when warm or in hotter weather... never in the cold, it turned out to be the IAC. I replaced it and haven't had a problem since.
John
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1977 Ford F250 XLT Ranger 4wd/ 351m/ NP435/ 205
1979 Ford Bronco XLT Ranger/ 460/ C6/ 205
1984 Ford F250 XL 4wd/ 6.9 IDI/ C6/ BW1345
1984 Ford F150 4wd/ 300/ NP435/ 208
1996 Ford F150 XLT 4wd/ 300/ ZF5/ BW1356
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Old 12-15-2010, 11:09 PM
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My 96 F150 with the 300 I6 did the same thing when warm or in hotter weather... never in the cold, it turned out to be the IAC. I replaced it and haven't had a problem since.
John
hmm ill hafta try tapping on the iac then
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Old 12-16-2010, 09:03 AM
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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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1977 Ford F250 XLT Ranger 4wd/ 351m/ NP435/ 205
1979 Ford Bronco XLT Ranger/ 460/ C6/ 205
1984 Ford F250 XL 4wd/ 6.9 IDI/ C6/ BW1345
1984 Ford F150 4wd/ 300/ NP435/ 208
1996 Ford F150 XLT 4wd/ 300/ ZF5/ BW1356
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Old 12-16-2010, 09:17 AM
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Originally Posted by Pkupman82 View Post
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.
Ok I will do that tonight then
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Old 12-16-2010, 05:27 PM
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Originally Posted by Pkupman82 View Post
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.
Well I used MAF cleaner on it and WOW did it make a difference the a/c doesn't effect the engine as much and it starts beautifully when warm . Thank you so much for the tips it is greatly appreciated.
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Old 12-16-2010, 11:45 PM
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I am having the same problem with my 96 4.9. Where is the IAC? I don't have a shop book yet. Is this part expensive? Thanks in advance!
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Old 12-16-2010, 11:51 PM
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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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Old 12-16-2010, 11:54 PM
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I thought that was it. Thanks for the quick reply! I am going to give it a shot this weekend and see if it cures the problem.
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1961 F-100 shortbed unibody Roller 302 and AOD on bags.
1964 Falcon Squire Wagon 302 C-4
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Old 12-16-2010, 11:59 PM
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The only thing is if your going to clean it idk how it would react to carb cleaner I thought I'd be safe and went with MAF cleaner because I didn't kno how sensitive it is.
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Old 12-17-2010, 12:03 AM
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I will go with the MAF cleaner then. Thanks again
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1961 F-100 shortbed unibody Roller 302 and AOD on bags.
1964 Falcon Squire Wagon 302 C-4
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  #14  
Old 12-17-2010, 12:06 AM
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Not a problem glad I could be of help
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Old 12-08-2013, 10:03 AM
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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
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Old 12-08-2013, 10:03 AM
 
 
 
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