Date: Sat, 3 Dec 2016 12:44:38 -0800
Reply-To: Neil N <musomuso@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Neil N <musomuso@GMAIL.COM>
Subject: Re: wild, racing idle... the solution pack
In-Reply-To: <CAF9Ro-ZwD39fYEu1etyOjS0vdJD=8yFq3=vD6KexiYK-b8661A@mail.gmail.com>
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Though this is for a different engine (VW), under OBD1 for that
engine, even if the ECU is programmed for an automatic transmission it
won't care or notice if the transmission control computer is not
present. And, even if a wiring harness from an automatic donor is
used, it doesn't matter if an "automatic" or "manual" TPS is used.
i.e. if using an "automatic" TPS, the only portion of wiring needed is
that which ( in part IIRC) connects directly to the ECU.
You may have done this already but I'd suggest doing a continuity of
each wire to-from the ECU connector to each sensor etc. Whoever
adapted the wiring harness could've missed connecting a wire or didn't
notice and repair a flawed wire. ** If the issues are being caused by
a wiring fault, this may be causing the engine management to go into
limp mode. Can you get blink codes from the ECU?
All that said, I bet it's just a vacuum leak issue as you suspect.
Neil.
** on my swap, as a total newb to engine conversions, I did not
connect a B+ wire to the ECU. This resulted in the idle hunting when
engine restarted hot; without a constant + , the ECU could not retain
a memory of the ISV previous setting when engine was shut down.
Connecting this wire fixed the issue.
On 12/3/16, Vincent Dow <ianvincentdow@gmail.com> wrote:
> Hello,
>
> I've written a couple of posts about my van's deteriorating idle.
>
> (1994 *or 95* ej22 in 1982 A.C. vanagon)
>
> It's always had a sticky idle, but now it's gotten unbearable. Lately it's
> been starting at 3500 rpm and sometimes staying there. It's rarely below
> 2000 rpm anymore. it will occasionally settle down to 900 and act normal.
>
> after 15 minutes driving in town, the CEL comes on and the idle drops way
> down, big loss of power. I'm convinced it's a vacuum leak - just feels like
> it. Exactly the same conditions as when brake booster hose came off - minus
> the hard-braking.
>
> Today i finally ordered a replacement gasket for the IAC.
>
> On Monday, i'm taking it into my mechanic's shop where he will be restoring
> the spare -tire tray, which was displaced at time of conversion.
>
> I'm going to pull the IACV before the van goes up on the lift... clean it,
> inspect the rubber boot etc.
>
> BUT, before I work on the IACV, I want to check out the TRANSMISSION ID
> wire.
> (I suspect that there are multiple problems with my van's idle)
>
> On the printed OBD1 pin-out chart, terminal B48.20 is listed as the
> Transmission ID.
>
> Do I understand correctly that this identifies if its MT or AT, and it
> would affect the vehicles idle. If my engine and ECU came out of an AT
> Legacy, I would want to reassign it as an MT.
>
> Is this a matter of grounding or ungrounding B48.20?
>
> I really want to see what this does, before beginning on the IACV.
>
--
Neil n
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