OT: QUICK! Digifant 2 HELP!

[nightmare16v1988 at hotmail.com (Krazy Horse)]

I agree, if I runs fine with the connector unplugged, then check that sensor 
to see if it is bad. Take an voltmeter to it and see if it changes its 
voltage with engine temp. It should be on a 0-5v scale (IIRC) Chances are 
its that sensor. You could do the "replace with known good part" to see if 
that works.

Also, when you unplug that sensor, it will put the system into open-loop. 
The mixture will richen and the O2S signal will be ignored.

HTH!

-Craig
'83 California Edition (RIP)
"Nightmare" '88 16v (PG-T Proj.)
"Calypso" '91 Golf GL (Daily Driver)




>From: Brian Wagner <brian_wagner@sbcglobal.net>
>To: Eric S <scirocco@vintagewatercooleds.com>,  Scirocco List 
<scirocco-l@scirocco.org>
>Subject: Re: OT: QUICK! Digifant 2 HELP!
>Date: Mon, 3 May 2004 08:04:47 -0700 (PDT)
>
>If it is the blue topped sensor it infact tells the ECU if the engine is 
cold and defaults to a rich condition for cold start. If it never triggers 
the ECU see's the engine as cold. Replace it they are $10 or so at the 
dealer.
>
>Brian
>
>Eric S <scirocco@vintagewatercooleds.com> wrote:
>
>Anyone good with Digi2? I need some QUICK help, my temp registration
>expires today, and I HAVE to get this thing to pass emissions.
>
>Last week it failed for too much HC (unburned fuel).
>
>It has, a terrible idle, and it misses at different parts of the rpm 
band.
>I have replaced: cap, rotor, wires and plugs. Set the timing (properly
>for Digi2 which is a wierd process), and it still was acting the same.
>So, just out of curiosity I pulled the plug to the coolant temp
>sensor...and guess what? Runs fine. Without a coolant temp sensor, what
>does digi2 default to? A lean mix or a rich mix? I suspect that my
>coolant temp sensor is bad and was telling the digi the engine was cold
>constantly, richening the mixture to a point of making it run like
>garbage. But I don't know enough about digi2 to say for sure.
>
>Anyone, please help, I HAVE to pass emissions in the next couple of 
hours
>before I head to work and get plates today...I'm just praying that with
>the coolant temp disconnected it will....
>
>--
>Eric
>www.vintagewatercooleds.com
>
>79 VW Iltis
>81 Rabbit Truck 2.0 16v
>81 Scirocco S (TDI Swap project)
>90 Corrado TDI
>91 Cabriolet (2.0 Crossflow swap project)
>
>
>
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