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Date:         Mon, 17 May 2010 21:59:47 -0400
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: clean & lube idle air control valve
Comments: To: Raymond Paquette <raymondpaquette@GMAIL.COM>
In-Reply-To:  <4BF1A466.5070900@gmail.com>
Content-Type: text/plain; charset="US-ASCII"

Yes, you can unplug the valve without issue. However both a bad valve or the controller can be a problem and unplugging the valve may let it return to a normal idle. Proper diagnostics includes measuring the current or the duty cycle going to the valve. There is a spec in the Bentley.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Raymond Paquette Sent: Monday, May 17, 2010 4:18 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: clean & lube idle air control valve

Can I run the engine with the IAV connector unplugged for diagnostic purposes? Or will I damage the controller?

If I do this and it idles right, that suggests that it's the electrical signal and not the valve that is wrong, correct?

Thanks

Raymond

Dennis Haynes wrote: > The idle air valve is not controlled by the ECU. There is a separate > controller in front of the passenger side tail light. The intermittent > symptoms you describe can be caused by a bad coil or broken spring in the > valve, a bad controller, or the controller getting bad information. The > controller see engine temperature(shared connection to Temp2 sensor with the > ECU), engine speed, throttle switch, and AC compressor on and power steering > pressure. > > Dennis > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > Raymond Paquette > Sent: Friday, May 14, 2010 8:12 AM > To: vanagon@GERRY.VANAGON.COM > Subject: clean & lube idle air control valve > > Any recommendations on what to do, what not to do to loosen up my idle > air control valve? What to use for solvent/penetrant that won't damage > it? Brake cleaner, gas, diesel, motor oil? > > Back story is that van sat for 2 years due to bad ECU. Ran perfectly > before ECU died. 2.1 in an '87 Syncro > > Now it idles at a pretty consistent 2200. Same thing on three different > ECU's I've tried. IACV buzzes (as I understand it should) when the key > is on, engine not running. Yesterday, out of idle curiosity (no pun > intended), I lifted the IACV and stuck my finger in the hole to seal the > vacuum leak I'd created. Motor immediately went to 900rpm which is where > it idles before ECU problem and two years of sitting. So, I WD40'd the > IACV let it buzz for a while, then put things back together. Now, each > time I take my foot off the accelerator, it idles steady, sometimes > right at 900, but often at another speed. Now, it's always less than 2200. > > This suggest to me that the IACV was stuck, now is moving but sticky and > inconsistently. But I really have no idea what the thing does nor how it > works (or doesn't). > > Am I on a useful path? Or, am I barking up the wrong tree? Suggestions? > > Thanks > > Raymond > > >


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