yes, another IAC problem
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4wd Low
Joined: May 2020
Posts: 10
Likes: 1
yes, another IAC problem
I recently replaced my metal coolant hose under the intake manifold.
after reinstalling it the truck would not idle and i got a IAC code.
the truck runs and drives fine, but will not idle at all, immediately dies.
i replaced the IAC and it made no difference.
Could i have damaged the wires or have the wrong connector plugged in?
cani test at the connector for signal from the computer, if so what values am i looking for?
after reinstalling it the truck would not idle and i got a IAC code.
the truck runs and drives fine, but will not idle at all, immediately dies.
i replaced the IAC and it made no difference.
Could i have damaged the wires or have the wrong connector plugged in?
cani test at the connector for signal from the computer, if so what values am i looking for?
Thread Starter
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4wd Low
Joined: May 2020
Posts: 10
Likes: 1
There No leak large enough to cause this.
I have double and triple checked all lines and replaced a collapsed Pcv elbow.
also don’t think a vac leak would trigger a IAC code.
from my understanding that is generated via amp draw on the solenoid
I have double and triple checked all lines and replaced a collapsed Pcv elbow.
also don’t think a vac leak would trigger a IAC code.
from my understanding that is generated via amp draw on the solenoid
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4wd Low
Joined: May 2020
Posts: 10
Likes: 1
well, maybe i need to take my last post back...
i have new codes that popped up.
origionally the codes were :
1504 Iidle air control curcut
0401 exhaust gas recirculation flow insufficient.
now i have a p0455 evap system leak (large leak).. so could be a vac leak, but i still dont see how that would trigger the 1504 code..
thanks for the help
i have new codes that popped up.
origionally the codes were :
1504 Iidle air control curcut
0401 exhaust gas recirculation flow insufficient.
now i have a p0455 evap system leak (large leak).. so could be a vac leak, but i still dont see how that would trigger the 1504 code..
thanks for the help
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
Think of it like this.
The IAC valve will try to compensate for a vacuum leak. If the leak is too large, the IAC valve would be extended to the lower limits of adjustment trying to compensate, but it won't be enough. The computer will see this as an IAC valve fault.
The IAC valve will try to compensate for a vacuum leak. If the leak is too large, the IAC valve would be extended to the lower limits of adjustment trying to compensate, but it won't be enough. The computer will see this as an IAC valve fault.
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Hiflyer746
1987 - 1996 F150 & Larger F-Series Trucks
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Mar 5, 2005 11:44 AM
