Date: Mon, 20 Jun 2011 16:05:41 -0400
Reply-To: pickle vanagon <greenvanagon@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: pickle vanagon <greenvanagon@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: <090701cc2f81$6fa87760$6401a8c0@PROSPERITY>
Content-Type: text/plain; charset=ISO-8859-1
really??
I think the whole purpose of the aux valve is to make cold starting
possible. (I think they're even sometimes called cold-start valves).
The idle screw setting appropriate for a warmed up engine is not enough for
a completely cold one. This is where the valve comes in, unless I'm
mistaken.
If the valve is stuck shut, I would definitely expect it to impact cold
starting.
On Mon, Jun 20, 2011 at 3:36 PM, Scott Daniel - Turbovans <
scottdaniel@turbovans.com> wrote:
> Aux air valve shouldn't have much to do with cold starting ..
> unless the hoses to it are off or something like that.
>
>
> ----- Original Message ----- From: "pickle vanagon" <
> greenvanagon@GMAIL.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Sunday, June 19, 2011 3:14 PM
> Subject: Re: '84 1.9L 2-WD -- cold start problems still the same after new
> O2-sensor, new Temp II sensor, and new plugs
>
>
>
> 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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