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Haterz gonna Hate
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Discussion Starter · #1 ·
This thread is to help everyone with that nasty idle problem with higher mileage Zetecs.

Tools needed:
2 Jack stands
1 Jack]
flat head screw driver
8mm socket with ratchet
(1/4 inch is recommended, 1/2 inch is hard to use in tight spaces)
Carb/Choke Cleaner (semi large can depends on how much buildup there is)


Step 1: raise and support focus with jack stands


Step 2: get your flat head screw driver and take off the intake tube on the throttle body so you can gain access to the IAC when you take it off from underneath


Step 3: get under the car with your 8mm socket ratchet and start feeling up in behind the starter on the intake manifold there should be two bolts loosen them up and then take them out with your hand, they are easy to take out. The IAC Looks like this on the intake manifold, the silver cylinder looking thing.



here is a pic of the IAC location from under the car you can tell its really hidden away





Step 4: once the IAC bolts are out it should be sitting in there because of the tight space, it wont fall out because there is a wire connected to it. get back on topside of the car and grab this wire that my index finger is pointing/laying on and that is the wire you can use to pull the IAC out..

dont jerk manuver the IAC around from atop so that it can easily be pulled out.


Step 5: grab your carb cleaner and go to town on inside of the IAC valve




BEFORE






AFTER






Step 6: let the IAC valve dry in the sun or just air dry until no cleaner comes out of it. then reinstall!

Hope this helps everyone that has this problem! [thumb]
 
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Use THROTTLE BODY cleaner. Most cars have a teflon or similar coating inside metal intake parts. Carb and break clean will take it right off and it will start to pit like a son of a bitch. I found this out when I cleaned the IAC and throttle body in my Ranger. Had to buy a new throttle body and IAC. The butter fly in my throttle body seized up and the IAC seized also. Better safe then sorry.
 

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Haterz gonna Hate
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Discussion Starter · #3 ·
Use THROTTLE BODY cleaner. Most cars have a teflon or similar coating inside metal intake parts. Carb and break clean will take it right off and it will start to pit like a son of a bitch. I found this out when I cleaned the IAC and throttle body in my Ranger. Had to buy a new throttle body and IAC. The buffer fly in my throttle body seized up and the IAC seized also. Better safe then sorry.
It can cause pitting, but most likely wont.. the carb cleaner is more harsh on the sensors around the TB because it is formulated to remove heavy varnishes found in carburetors. so that means it should be 100% okay to sue on the IAC since it is a valve. dozens of people have used carb cleaner on it it just is stronger than the Throttle body cleaner
 

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It can cause pitting, but most likely wont.. the carb cleaner is more harsh on the sensors around the TB because it is formulated to remove heavy varnishes found in carburetors. so that means it should be 100% okay to sue on the IAC since it is a valve. dozens of people have used carb cleaner on it it just is stronger than the Throttle body cleaner
good write up.......I agree with the TB cleaner.....On my Ford Rangers sites they suggest just cleaning...on my Saab forums they suggest to clean and oil it with engine oil........I am not sure what is the correct way?
 

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Discussion Starter · #5 ·
bump let's get this thing int he HOW to section. there is no how to on this and alot of people dont know how to do this...
 

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Discussion Starter · #8 ·
thanks guys! [thumb]
 

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Discussion Starter · #9 ·
bump, lets get this stickied
 

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Awesome write-up! I have been looking on here for DAYS for a how-to for this...Thanks!
 

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I went to ford here and they have that listed as a IAC air bypass valve gasket was cg56?
 

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I know you guys think I'm FOS, butI use SeaFoam in my oil/gas ans my IAC has not stuck again. Mabye I was lucky, mabye not. All I know my high throttle started operating again when the AC pump kicked in.
 

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(1/4 inch is recommended, 1/2 inch is hard to use in tight spaces)
Thanks for the great write-up!!

My 1/4-inch Craftsman ratchet was too large for the bottom IAC bolt. I used a mini combination wrench (8mm or 5/16-inch). You don't need alot of leverage - IAC bolts are only torqued hand-tight. I also found a telescoping mirror to be helpful.

Before starting, grab a handful of Q-tips -- you'll need them to help the cleaning fluid do its job.

This job is definitely do-able -- but requires PATIENCE!!
 

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[8D]I prefer the easy way: idle the engine and squirt the cleaner in the throttle bypass until it stalls and let it sit for an hour. I know your way is better, but my way is easy enough to do every oil change or so.[8D]
 

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got my IAC removed...went to look back at these pics to compare...there gone..

My iac was pretty clean...I got a replacement, just in case....the new one has a spring inside. Installed it and the motor REVed high..took a while for it to idle down....
once it calmed down it was nice and smooth..UNTIL I TOUCHED THE THROTTLE....it peaked again in gear!
Took it for a spin....it was like having the cruise control on...gonna take it off, and put the old on back and see if the new one was bad..

anyone else have this issue?..
 

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Rob,
I'm sorry to say that I have had the same issue. Replaced the IAC with a new one but could not the gasket on. (major mistake). now when i start the car it revs way too high for like 5 minutes and then comes to a normal idle. But the thing is messed up because it accelerates on its own at 40 mph with my foot off the gas.

I will remove this IAC and put the gasket on like i should have. According to the experts/moderators on this site, a vacuum leak around the gasket can be the cause. Since all i fooled with was the IAC (plus cleaning TB) it appears the gasket (lack-of) is implicated.

I'll report back whhat happens with the new gasket.
 

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Sugestion???

Buy the unit through FMC because of the stricter standards they require the IAC manufacturer to adhere to. Fix it once and ferget it.
 

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Can the pictures from the first post be put back up? I live about 3 hours away from the car and would like to know what everything looks like before i clean or replace the IAC valve.
 
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