iac valve question?
Thread Starter
|
Fleet Mechanic
Joined: Dec 2006
Posts: 1,338
Likes: 6
From: UPSTATE NY
iac valve question?
idle air control question. i have read the treads about it, and it seems like i might need to pick up a new one and slap it in. i have cleaned mine out and it didnt seem to help. everything works totally fine unless i turn the a/c on. this is when the idle surges to like 2000 rpms and its a royal pain to try and drive and shift. i used to have a low charge and it was cycling the compressor causing some idle surges, but i have fixed that. is there a troubleshooting procedure for this little valve?
to me it all just boils down to having a computer controlled fuel injected nonsense vehicle! they claim to run better than the older vehicles and they never do, nor are they ever easy to fix. the check engine light never even comes on.
oh and also i get some overheating when its acting up. i believe part of the iac job is to adjust the idle and regulate a different amount of air flow during hotter conditions.
to me it all just boils down to having a computer controlled fuel injected nonsense vehicle! they claim to run better than the older vehicles and they never do, nor are they ever easy to fix. the check engine light never even comes on.
oh and also i get some overheating when its acting up. i believe part of the iac job is to adjust the idle and regulate a different amount of air flow during hotter conditions.
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Sounds like the IAC is acting out, with the A/C idle up problem.
Look in the "Tech Info" thread atop this forum for some IAC trouble shooting ideas.
The over heat problem with the A/C on, is likely something else.
Maybe a fan clutch problem, thermostat, clogged cooling system, partially collasped radiator hose, slipping serp belt, plastic bag, bugs, or other debris restricting air flow through the A/C condenser & radiator fins, wrong coolant to water ratio, ect, ect, so maybe have a close look under hood at the cooling system things.
Look in the "Tech Info" thread atop this forum for some IAC trouble shooting ideas.
The over heat problem with the A/C on, is likely something else.
Maybe a fan clutch problem, thermostat, clogged cooling system, partially collasped radiator hose, slipping serp belt, plastic bag, bugs, or other debris restricting air flow through the A/C condenser & radiator fins, wrong coolant to water ratio, ect, ect, so maybe have a close look under hood at the cooling system things.
Cargo Master
Joined: Feb 2002
Posts: 2,414
Likes: 22
From: Tucson USA
I disconnected the IAC on my 94, adjusted the stop to pick up he rpms and have not had any issues. We trouble shot the system and it has a short in the wire bundle someplace so that why I did what I did.
Idles at around 750 rpm with ac on or off.
Idles at around 750 rpm with ac on or off.
Thread Starter
|
Fleet Mechanic
Joined: Dec 2006
Posts: 1,338
Likes: 6
From: UPSTATE NY
2pd yes i changed the iac from advance auto parts, but unfortunately it did not fix the problem, so i then took it back to the store haha. its so intimidating when you open the hood of these newer cars with all the bells and whistles. i am going to invest in a book. the idle surges to 2000 rpms only if i run the a/c. without the a/c running the truck runs fine.
if i disconnect the connector on the a/c compressor the idle surges to 2000 rpms at all times while driving. my guess is something that tells the truck to increase the idle only a little bit with the a/c on, is going haywire
if i disconnect the connector on the a/c compressor the idle surges to 2000 rpms at all times while driving. my guess is something that tells the truck to increase the idle only a little bit with the a/c on, is going haywire
Thread
Thread Starter
Forum
Replies
Last Post
JFlom77
1987 - 1996 F150 & Larger F-Series Trucks
3
Feb 23, 2010 01:00 AM
jcstratt
1997 - 2003 F150
3
Jan 31, 2006 11:28 PM
