Hi,

I want to clean my IACV just to try and get everything in the engine as close as possible to new and I don't feel confident pulling it apart.

What if i were to disconnect the hose from the air intake and while running the car, hold a household vacuum cleaner up to the hole in plastic air intake pipe to get the air flow meter to read flow of some sort (even if it's too little or too much, it shouldn't matter too much for this exercise right?) and spray heaps of throttle body cleaner into the valve until the engine stalls or nearly stalls. I don't mind seeing a bit of black smoke.

Would this work?

 

Here ya go..http://www.exclusiveatlanta.com/maxi...dy%20vg30e.htm

 

I'm not interested in cleaning the throttle body. I believe that air rushes so fast through the throttle body that any deposits that would make a difference would be blown off anyway. Just The IACV valve. What is the best way to be able to spray throttle body cleaner into the IACV but still have air flowing through the MAF?

 

Thats a good one - for TB.

IACV http://www.cardomain.com/ride/748507/4

 

TB carbon buildup has an effect to idle.

Jam buttefly to 1500rpm, take IACV hose out, spray. Result: bs

 

Great idea! Way better than mine! I'll do that tomorrow. I'll spray half a can into it HARD and really flush it out. I know it'd be better to pull it apart but I just don't have the confidence or the money in case something goes wrong. Thanks

 

Hang on, is the IACV still open if the throttle is open too? I thought it wouldn't be.

 

Sorry...Just woke up...No coffee yet...

 

I suppose it is, really dunno. I think stepper ctrleed valve stays where it is... no effect if its oen/close, I suppose.

The reason is, the TPS zero pos sw has to be open and airflow meted by MAF to keep engine running when IACV hose is out /idle circ is killed.

Cleanup /opening is piece of cake.

 

I just pulled both of them apart over the weekend and used 'GM Cleans' and few dozens cotton swabs. There was not much deposits in the TB, but IACV had quite some black powder that just fell out of it when I pulled the stepper motor and lots of deposits in the body and on the motor shaft (the part, that looks like little p.nis). One thing I am not sure about now is ENORMOUS low end power. When I touch throttle from dead stop, the car wants to spin wheels. Could it be a problem that I did not put the TPS exactly at the same angle? I just put it where I thought it was by the bolt marks on its bracket.

 

What Did U Do!? What Did U Do!? Tell me u secret!

TPS has zero pos sw, should change state at 1k rpm.

 

These are the problems that I don't want to have by pulling it apart. I think I might stick to my original plan. I think the IACV valve would close itself once the throttle is opened. I want to spray heaps of throttle body cleaner into it while it is 'sucking' it through. It will choke the engine a bit but that's OK. This is why I suggested that i put a vacuum cleaner up to the plastic intake pipe to get a bit of air passing through the air flow meter while the IACV sucked air and throttle body cleaner into it. I'm sure I'll figure it out.

 

It may or just stay... I think not. That would cause jerky transition. As said, havent got röentgen sight.

With spray no way to clean stepper axle/valve screw. And that is the cause of jerky valve movement.

 

You didn't say if you have a VG or a VE, but I am assuming you have a VG.

Since you don't feel comfortable taking YOUR IACV off, I suggest you find a u-pull-it junkyard and take one off of a wrecked car (they will probably charge like $10). Then, you can see how easy it is to disassemble. From that point, you can clean that one out really good, buy a gasket (make sure you have this before doing any work on your own car) then either install it on your own car or take yours off and clean it, then reinstall it.

I have not worked on a VG, but the IACV in a VE is designed where there is really not a good way to clean it without taking it off. All of the entrances have little metal mazes that don't allow any kind of spray directly on the dirty parts.

Good luck

 

Hmm... The FSM actually has a diagram of for the output of the TPS for the throttle angle range. Gotta go back tonight and read the output and see whether it's in the correct position.

 

cleaning out the IACV with STP air intake cleaner stopped my car from dying when i put it in gear. it runs great now....it was pretty carboned up.