2000 F150 idle speed doesn't increase when cold
#1
2000 F150 idle speed doesn't increase when cold
My 2000 F150 (5.4L) just recently developed a problem where it won't increase the idle speed when I first start it in the morning or after it's sat for many hours. It starts immediately, but then dies unless I hold my foot on the accelerator. I have to do that as I back out of the drive & maybe at the end of the block. But once warmed up some, it's fine - idles at ~ 600 rpm. If I shut the engine off & restart it immediately or say, w/in a couple hours, it's still fine.
Is this a common problem when one sensor, etc., goes bad, that it only affects the idle speed when the engine's cold? I don't have a code reader for this vehicle, but guess I could buy one, even though can't afford it right now.
Thanks.
Is this a common problem when one sensor, etc., goes bad, that it only affects the idle speed when the engine's cold? I don't have a code reader for this vehicle, but guess I could buy one, even though can't afford it right now.
Thanks.
#2
Originally Posted by phkhgh
My 2000 F150 (5.4L) just recently developed a problem where it won't increase the idle speed when I first start it in the morning or after it's sat for many hours. It starts immediately, but then dies unless I hold my foot on the accelerator. I have to do that as I back out of the drive & maybe at the end of the block. But once warmed up some, it's fine - idles at ~ 600 rpm. If I shut the engine off & restart it immediately or say, w/in a couple hours, it's still fine.
Is this a common problem when one sensor, etc., goes bad, that it only affects the idle speed when the engine's cold? I don't have a code reader for this vehicle, but guess I could buy one, even though can't afford it right now.
Thanks.
Is this a common problem when one sensor, etc., goes bad, that it only affects the idle speed when the engine's cold? I don't have a code reader for this vehicle, but guess I could buy one, even though can't afford it right now.
Thanks.
https://www.f150online.com/forums/sh...h+idle+problem
you'll have to cut and paste i mees the link up somehow
Last edited by Tumba; 01-26-2008 at 02:49 AM.
#7
Originally Posted by Tumba
Try this link I think if you clean the IAC it do the trick
https://www.f150online.com/forums/sh...h+idle+problem
you'll have to cut and paste i mees the link up somehow
https://www.f150online.com/forums/sh...h+idle+problem
you'll have to cut and paste i mees the link up somehow
I fixed
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#8
Thanks for the replies & link!
Would the "IAC" being stuck go along w/ the symptom that it won't increase idle speed when cold, but the idle speed is completely normal once engine warms up?
There is one other thing I forgot. The accelerator linkage is sometimes a little sticky when first depressing the accelerator. Not much, but noticable - especially when weather is colder. Don't know if that has anything to do w/ this prob.
Would the "IAC" being stuck go along w/ the symptom that it won't increase idle speed when cold, but the idle speed is completely normal once engine warms up?
There is one other thing I forgot. The accelerator linkage is sometimes a little sticky when first depressing the accelerator. Not much, but noticable - especially when weather is colder. Don't know if that has anything to do w/ this prob.
Last edited by phkhgh; 01-25-2008 at 11:38 PM.
#9
Thanks for all replies & the link.
I read that some suggested cleaning the IAC w/ throttle body cleaner (removing it 1st). Of course, Chiltons says "do NOT attempt to clean the IAC w/ any type solvent cleaners - it will damage the internal components."
I've read up a little & some say ignore the warning to NOT use *throttle body cleaner* or any other to clean the IAC, the ports where it connects to the throttle body (which apparantly sometimes get carboned up), or even the butterfly valve, etc., inside of the throttle body.
Is this a good idea or not to clean the IAC & connection ports, & especially the throttle body w/ throttle body cleaner?
I notice there are about 4 different error codes listed in the Chilton's for the IAC.
If I decide to buy a code reader, any suggestions on brands / models that won't break the bank but aren't complete junk? The most common brand locally is Actron, but may be others if I searched enough.
Thanks again.
I read that some suggested cleaning the IAC w/ throttle body cleaner (removing it 1st). Of course, Chiltons says "do NOT attempt to clean the IAC w/ any type solvent cleaners - it will damage the internal components."
I've read up a little & some say ignore the warning to NOT use *throttle body cleaner* or any other to clean the IAC, the ports where it connects to the throttle body (which apparantly sometimes get carboned up), or even the butterfly valve, etc., inside of the throttle body.
Is this a good idea or not to clean the IAC & connection ports, & especially the throttle body w/ throttle body cleaner?
I notice there are about 4 different error codes listed in the Chilton's for the IAC.
If I decide to buy a code reader, any suggestions on brands / models that won't break the bank but aren't complete junk? The most common brand locally is Actron, but may be others if I searched enough.
Thanks again.
#10