Date: Fri, 13 Mar 2015 20:46:53 -0500
Reply-To: Kevin Duvernay <kduvey@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Kevin Duvernay <kduvey@GMAIL.COM>
Subject: Re: Idle Control System Explanation, please?
In-Reply-To: <01c901d05df6$cb1d7df0$615879d0$@gmail.com>
Content-Type: text/plain; charset=UTF-8
Thanks for the informative post. Much of that I have already done and am
fairly confident the new TB and TPS will solve my remaining minor issues.
What I'm looking to understand though is how I went from an inoperative TCV
and TCU to both functioning and saw basically no effect. It ran great
before and runs great now. (the idle issues are very minor, Most people
would say it runs perfectly).
On Fri, Mar 13, 2015 at 8:32 PM, Stuart MacMillan <stuartmacm@gmail.com>
wrote:
> Oooh, there is no end to the fun with this overly complicated piece of
> junk system. I've just been through this exercise on my son's '87, and it
> took me a month. After running a 2.1 for years in my '84, I wish I could
> just replace the whole FI system with the one from the 1.9. Or with a
> Subaru engine.
>
> You've eliminated the most common problem, the idle control module. That
> was one of my problems. Then I found a bad injector and a bad O2 sensor.
> After a full tune up including adjusting the TPS and timing, new temp 2
> sensor (no change) coil, wires, plugs, fuel pump, four rebuilt injectors,
> and a new O2 sensor, (slight up and down idle with the bad one), I think
> I'm good. So far, anyway, but I've also found a Subaru donor car.
>
> Install the new throttle body and work down the list from there. Be sure
> to check for vacuum leaks and clean all the engine grounds. Be sure to use
> a new TB rubber seal too, the old ones are hard as a rock and can leak.
>
> Stuart
>
>
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of Kevin Duvernay
> Sent: Friday, March 13, 2015 5:52 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Idle Control System Explanation, please?
>
> Posted this on the Samba, but not getting much action there.
>
> Okay, get this:
>
> 87 2.1, all stock. Trying to diagnose some minor idle issues. Noticed my
> idle control valve wasent vibrating with ignition on, instead it was making
> a very faint whine (could really only hear it with my ear right next to
> it). So, I put a known working idle control valve in, same thing. Then I
> swapped in a known working idle control module (behind the right tail
> light) and boom, the idle control valve starts vibrating.
>
> However, it didn't really effect the idle of my van at all. If I had a bad
> idle control module in there that was also causing the idle control valve
> to malfunction, how could getting both working again possibly have little
> to no effect on my idle?? just looking for an explanation. Repose off idle
> does seem to have slightly improved however.
>
> For those curious, my idle issues are: idles slightly high, at or just
> above 1000. Also has a "pulsing" sound but rpms don't seem to pulse with
> it. Can only hear it from the inside. Ive got a rebuilt throttle body with
> a brand new TPS from Gowesty in the mail now, as I highly suspect I have a
> slightly worn throttle body and I know my TPS isn't perfectly adjusted and
> is incapable of being properly adjusted.
>
> Anyways, Ill save those questions till after i get the new throttle body
> and switch in, mostly curious about the module and valve effects on idle
> (or lack there of??) Is it possible that my finicky throttle switch is
> somehow not alowing the idle contol module to work as/when it should?
>
>
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