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Cleaning Sticky Idle Stabilizer Valve (ISV)
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Redshoes56
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PostPosted: Wed Jan 21, 2009 3:21 pm    Post subject: Cleaning Sticky Idle Stabilizer Valve (ISV) Reply with quote

I have a problem with my 89 Vanagon 2.1. After a long park in the garage and some cold weather the engine has a high idle problem (~ 2000 RPM). I took it out for a good long drive and warm up but the high idle issue remained. In the past it has idled around 1000 RPM but had a fluctuation that would run up to 1200 and then back down, then back up. I have tried cleaning out the ICV with carb cleaner.

The high idle drops off and remains steady at 1000 RPM if I tap the ICV body with a screwdriver.

This feels like it might be bad ICV but wanted some advice before I lay out $$$$.

Thanks in advance for any help!
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kylemason
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PostPosted: Wed Jan 21, 2009 5:07 pm    Post subject: Reply with quote

Bentley Fuel Injection section 24.53 has the tests for that part of th FI system. If you search for idle stabilizer you will get more help on this. Just page the search results thru till you see the posts.
Kyle
PS if your rubber mount is broken as mine was you can develop an air leak on the connector hose on the bottom of the idle stabilizer valve.
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tencentlife
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PostPosted: Wed Jan 21, 2009 6:02 pm    Post subject: Reply with quote

Remove the ICV and flush it out with carb cleaner and blow out with air. Do it a couple times. You valve sounds like it is working but getting gummed up, and cleaning usually gets them working smoothly again. This is a common problem.

The valves rarely actually fail. The controllers? Ehhh, not so much.
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Redshoes56
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PostPosted: Wed Jan 21, 2009 7:48 pm    Post subject: Flushing ICV Reply with quote

Thanks for the reply and suggestion. I had tried flusihing earlier with carb cleaner buy spraying carb cleaner into the two opeinings that normally connect to hoses. Is that the right place? It doesn't seem like it is actually getting to the sticking valve inside the part housing. Am I doing this right or is there some way to expose the inside of the valve so I can clean more completely?

Thanks in advance for any help!
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tencentlife
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PostPosted: Wed Jan 21, 2009 8:05 pm    Post subject: Reply with quote

That's how you do it, spray it in from both ends. Let it soak in there, then blow it out. You can also easily work the valve when off the car by just jumping its two pins to a 12V battery, polarity doesn't matter. It is a simple solenoid, apply power to hold the valve open as long as you want, and you can shoot cleaner thru it while held open. Work it a bunch of times and spray and blow it out, eventually it will free up. If it doesn't open and close with a smart snap, but a thud instead, then it's still dirty. They catch a load of oily crap from the crankcase breather system. Your symptoms sound like the solenoid still works, so it seems pretty sure you'll get it to work better just by cleaning.

A maintenance cleaning every few years wouldn't be a bad idea to keep it working smoothly.
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Redshoes56
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PostPosted: Tue Feb 03, 2009 8:36 am    Post subject: IDle Stabilizer Valve Cleaned Reply with quote

Thanks for the great instructions for cleaning the ISV.

I was able to rig a couple of 6V batteries and then do a good cleaning. The valve seems to pop open nicely. I also bought a used valve on Ebay and the van now idles better than ever.

Again, thanks for all the help!
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tencentlife
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PostPosted: Tue Feb 03, 2009 9:21 am    Post subject: Reply with quote

Cooly cool. Glad that worked out for you.
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djkeev
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PostPosted: Sun May 24, 2015 5:22 am    Post subject: Reply with quote

What if the idle is still incorrect after cleaning the valve?

More info......
http://www.thesamba.com/vw/forum/viewtopic.php?t=343557
************
A few helpful links to the Idle control relay......
I just did a time consuming search on this.
Just trying to gather info together for future reference.

http://www.thesamba.com/vw/forum/viewtopic.php?t=508268

http://www.thesamba.com/vw/forum/viewtopic.php?t=542448

http://www.thesamba.com/vw/forum/viewtopic.php?t=473007

http://gerry.vanagon.com/cgi-bin/wa.exe?A2=ind9605&L=vanagon&P=R24946&D=0

Dave
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Vanagon Nut
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PostPosted: Sun May 24, 2015 10:24 am    Post subject: Reply with quote

Not sure if this will help, but I recently found that by setting my VOM to measure AC current, I could actually see a current value for the Bentley "430 mA" thing. Even though the valve hummed, pulsed (I blew air through and could hear the are "whiz" past), was cleaned several times and I could gently move the valve by hand, the ICV only drew 150-200 mA regardless of having inputs or not. Re-reading tencentlifes posts, don't know why my meter didn't show a value when set to DC current. Question
I recently got a killer deal on a used (rebuilt?) AFM and ICV so swapped that new valve in. I'll measure things again.

I drove around with the IC system completely disconnected. Once warmed up a little, van ran fine. If the idle sorts itself out in that case, the issue is likely with the IC system. It's not hard to check continuity of each wire from ICU to inputs etc.

Neil.
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PostPosted: Wed Mar 23, 2016 3:36 pm    Post subject: Re: Cleaning Sticky Idle Stabilizer Valve (ISV) Reply with quote

Just wanted to bump this thread up because cleaning the ISV as described by the uberguru did the trick for my slightly high idle in park, that very intermittently would actually get "stuck" when going into park around 1300-1400 after hour-plus drives. Easy fixes (for now) are always great!
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Merian
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PostPosted: Wed Mar 23, 2016 7:23 pm    Post subject: Re: Cleaning Sticky Idle Stabilizer Valve (ISV) Reply with quote

Redshoes56 wrote:
In the past it has idled around 1000 RPM but had a fluctuation that would run up to 1200 and then back down, then back up.


is it still doing that?

if so, what is the time period of the oscillations in idle speed?

kinda sounds like it might be a "hunting idle" problem Arrow
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