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Stumbles on startup?

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Old Sep 20, 2025 | 11:19 AM
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Stumbles on startup?
I have a 1990 f150 with the 4.9L straight 6. When the truck is cold, like the first start in the morning, the engine stumbles and will die unless I quickly press the gas. Anyone have any ideas to what could cause this? Only recently started happening now that it's getting cooler outside
 
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Old Sep 20, 2025 | 01:54 PM
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Clean IAC valve first.
 
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Old Sep 26, 2025 | 01:13 PM
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Cleaned
Originally Posted by jas88
Clean IAC valve first.
cleaned iac valve and changed gasket but didint seem to fix the issue
 
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Old Sep 26, 2025 | 01:17 PM
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Did you reset the computer after?
 
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Old Sep 26, 2025 | 01:18 PM
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Originally Posted by jas88
Did you reset the computer after?
No.. didn't think about it. Do I just unhook the battery for a few or do I have to do something to reset it?
 
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Old Sep 26, 2025 | 02:03 PM
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They say to unhook the negative battery cable for atleast 10 minutes.
 
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Old Oct 11, 2025 | 03:37 PM
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Originally Posted by 88n94
They say to unhook the negative battery cable for atleast 10 minutes.
ok, been a while but have some updates. After cleaning iac and replacing gasket, as well as resetting the ecm and driving it at least 20 miles for the ecm to recalibrate, the problem is still there. It only happens every like 1 in 3 cold starts. Any other ideas?
 
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Old Oct 12, 2025 | 03:14 AM
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Originally Posted by mbooth576
ok, been a while but have some updates. After cleaning iac and replacing gasket, as well as resetting the ecm and driving it at least 20 miles for the ecm to recalibrate, the problem is still there. It only happens every like 1 in 3 cold starts. Any other ideas?
leaky injectors or fuel pressure regulator problems. also could be vacuum leaks and egr related or canp related
 
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Old Oct 12, 2025 | 07:37 PM
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I don’t have any luck cleaning the IAC. Are there KOEO fault codes?
 
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Old Oct 13, 2025 | 10:12 AM
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Originally Posted by My4Fordtrucks
I don’t have any luck cleaning the IAC. Are there KOEO fault codes?
nope, no codes at all. Also, truck idles and runs fine after it starts just has an issue when starting
 
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Old Oct 13, 2025 | 10:34 AM
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Old Oct 13, 2025 | 11:50 AM
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Originally Posted by mbooth576
nope, no codes at all. Also, truck idles and runs fine after it starts just has an issue when starting
Not even the system pass code 11/111?
 
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