Date: Sun, 19 Jun 2011 16:32:25 -0700
Reply-To: Rocket J Squirrel <camping.elliott@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Rocket J Squirrel <camping.elliott@GMAIL.COM>
Subject: Re: '84 1.9L 2-WD -- cold start problems still the same after new
O2-sensor, new Temp II sensor, and new plugs
In-Reply-To: <BANLkTi=gWzG5p9J_dF+Pdpd2=66prZKDxg@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Can anyone point me to the Bentley pages referencing this thingy?
On Sun, 2011-06-19 at 18:14 -0400, pickle vanagon wrote:
> The only other thing that comes to mind is the aux air valve.
>
> This is the little valve that is supposed to be open when the engine is cold
> letting in extra air, and then close as it warms up. It has a plug that
> goes into it as well, that powers a heating element.
>
> The spring in yours might be worn out, or maybe the valve "door" itself is
> gunked up and stuck in place.
>
> I don't think these can be purchased new anymore in the Vanagon part number,
> but I think they are interchangeable across old VWs (jettas, busses,
> whatever). [warning: I'm embarrassed to say that I know from experience
> that it is easy to overtighten the locking nut on the the adjustment screw
> and break off the screw.]
>
>
> But, on the other hand, your aux air valve could be fine, in which case this
> is going to add another variable that you'll be fiddling with trying to get
> in the right balance with the idle screw setting.
>
> Good luck!
>
> On Sat, Jun 18, 2011 at 12:43 PM, John Lauterbach <
> jhlauterbach@bellsouth.net> wrote:
>
> > Cold start problem definition: Engine temperature and air temperature
> > around 70-75 degrees Fahrenheit. Start engine w/o foot on accelerator
> > pedal. Engine starts and goes to around 800 rpm (instrument panel
> > tachometer). If slight pressure put on accelerator pedal to take rpm to
> > 1500 or so, and then pedal released, rpm drops to around 300 and engine
> > tried to stall and then picks up speed and then tries to stall. Slight
> > pressure on accelerator pedal for a couple of minutes or so, solves the
> > problem.
> >
> > Here is what I have done: New within the past two weeks are new
> > O2-sensor, new Temp II sensor, and new plugs. A couple of months ago, I
> > put in new rotor and cap. Timing is just ahead of the mark. I am also
> > working with backup ECU and I have cleaned the contacts on large cable
> > going into ECU. I have checked for vacuum leaks and replaced suspect
> > hoses and fittings.
> >
> > Engine is Boston Bob rebuild that I installed in September 2003. Has
> > about 40,000 km on odometer. Just about everything I could buy
> > new/rebuilt at that time such as distributor and AFM went was replaced
> > at that time. A few years ago, I installed a rebuilt throttle body.
> >
> > Recommendations on next steps would be appreciated.
> >
> > John
> >
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