The_Phantom

I've read in posts that I found with a search that some people have cleaned their idle stabilizer valves but no one has really described how to clean it. Can anyone tell me the best way for my '89 944? Also, I hate to admit this and although I've replaced the throttle position sensor myself and replaced tons of other things on the car but I'm not sure where the ISV is...

Wipeout

It's under the intake manifold.

Not sure how you'd clean it out.

The_Phantom

Is it difficult to replace?

Darwantae951

Some say it doesn't, but I couldn't get mine out without removing the intake. Once the intake is outta the way, it's pretty easy. Your ISV mounts will probably break tho (they are $7 a pop from paragon) so count on that.

jmd_forest

I had to pull the intake manifold to remove mine for cleaning. I used carb cleaner spray and actuated the valve by connecting ground to the center pin and 12 V to the end pins, mutually exclusively. Followed up with a few more shots of carb cleaner and new vacuum hoses. IIRC these hoses were VERY expensive from Porsche ($79 ro so) so I simply took the hoses to Napa and had them match them up as best as possible for about $14

jmd_forest

Darwantae951

The hoses aren't that expensive. 70 bucks for every hose under the intake from paragon.

Riff

With my S2, I was able to get the ISV out from under the IM without removal.

Cleaning was spraying the inside of the valve with PB Blaster and manually manipulating the valve open and closed.

Good Luck,

Airflite40

I just did this the other day. You clean by shooting brake cleaner through it, then you can take q-tips, dipped in your favorite solvent (brake cleaner again for me) and clean the actual rotating part if spraying didn't get all the gunk.

ArcticSteve

All I have done is disconnect one of the main hoses that lead to the ISV and spray quite a bit of carb cleaner in it and it will run down and give the thing and soak and clean. I left it overnight before starting.

Fluidplay

Clean as Riff outlined and check it for air leaks before you reinstall. The seams at the botom where the top portion slips over and is tabed into the lower loses its' seal over time and can create small vac leak. I used JB weld to reseal and it worked MUCH better.

The_Phantom

I would love to do that. Anyone have a picture of this part of the engine so I could locate the ISV?

knfeparty

It's basically right under the wide part of the intake manifold before the manifold splits into 4 separate pipes for the intake ports. It looks the size of a short red bull can with a little t at the top maybe.

IMO it falls under the "if it ain't broke..." rule. You're very likely to induce all sorts of vacuum leaks by touching stuff under there. Definitely order some vacuum line kit (paragon/lindsey) before you touch it.