Engine cutting out when coasting to neutral in cold weather.

[93LegacyTurbo]

I have a EJ22T with high miles and M/T. When in cold weather, the engine frequently idles too low and drop dead when coasting to a stop. I have to keep on restarting it or do left foot braking/bliping the throttle. There's no oil leak, no loss of power when driven. No CEL either. It doesn't happen very often in warm climate but very frequent in below freezing temperature. What's there to look for? I tried resetting the ECU by unplugging the battery but it only makes matter worse.

[LaureltheQueen]

has happened to me once, when i stuck it in neutral to coast up a freeway off ramp. I have an automatic. That sucked.


Have no clue... Get a new motor?

[THAWA]

sounds like your iac valve, i don't like to say this but, there's too many different topics on the subject so it'd be best to just search for it yourself.

[93LegacyTurbo]

I did a search but still don't know what IAC valve is or where it is located.

[ciper]

Directly below the PCV valve. The biggest pipe that connects to the intake. You will probably have to remove the bracket that holds the plastic engine cover, the TPS and the PCV in order to remove the electrical connection on the IAC.

Im used to an NA so the piping setup and items that need removed may be different.

[93LegacyTurbo]

.m

[boostjunkie]

My old 90 legacy would do this (it was an auto, tho). I'd be pulling into my driveway and as I was slowing down the engine would bog and then die. Eventually, I got a code for an o2 sensor. Once that was replaced, the car ran fine.

[THAWA]

I did a search but still don't know what IAC valve is or where it is located.

http://www.thawa.net/images/categories.php?cat_id=7
it's the orangey-brown thing in the pic, might be different colored in yours, my last one was grayer

[93LegacyTurbo]

What exactly does IAC valve do and why is it causing the problem?

[ciper]

Idle Air Controller

Meaning it controls how much air bypasses the throttle plate. It may be sticky or adjusted too low.
When you start the car in the morning does the idle ever jump up and down before settling?

[Legacy777]

IAC vavle
http://www.main.experiencetherave.com:8 ... P_2470.JPG

more pics of stuff on the manifold
http://www.main.experiencetherave.com:8 ... injectors/

[93LegacyTurbo]

I'll trying cleaning the IAC valve first. How do I take it out? Does it require special tool?

My car has always idled fine during start up.

In extreme cold weather, it does rev to 3000rpm though for 30 secs or so.

[LaureltheQueen]

Idle Air Controller

Meaning it controls how much air bypasses the throttle plate. It may be sticky or adjusted too low.
When you start the car in the morning does the idle ever jump up and down before settling?

so that would by why it does that..... damn

[THAWA]

To remove the IAC valve you have to take off the air hoes and two coolant hoses that go to it (they're a pain in the ass to do). Then remove the 4 bolts that hold it to the intake manifold. It might be easier to do this with some of the other pcv tubes and wires removed

[ciper]

That is the correct method for removing the entire valve but I dont think you need to. Ive always cleaned mine on the vehicle. Aren't you afraid the gasket might not seal correctly? Besides, who wants to remove micro sized coolant lines?

Try cleaning it on the car first. Also check the three hoses that are part of the PCV system, when they get really clogged up it can also effect the way the car idles.

[93LegacyTurbo]

How do you clean the valve without taking it out?

[ciper]

http://bbs.legacycentral.org/viewtopic.php?t=194

Basically you close the valve and fill the large tube with carb cleaner. As you pressurize the tube carb cleaner sneaks past and takes junk with it. Slowly opening the valve takes larger crud. Afterwards turning while spraying.