Date:         Sat, 19 Nov 2016 19:45:30 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: 2.1 WBX Warm Start Troubles
Comments: To: Michael Magnani <mfmagnani@SBCGLOBAL.NET>
In-Reply-To:  <598485665.365017.1479599162412@mail.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"; format=flowed

At 18:46 11/19/2016, Michael Magnani wrote:
>My Temp 2 Sensor is brand new. Actually, it was 
>the first thing I changed.I've got 5.1 VDC at 
>the power wire and a steady .5 Ohms at the 
>Ground wire.I've also got a Shoebox Electronix 
>8691V ECU Monitor wired into my ECU.The book 
>says I should have less than .95 VDC at the ECU. Right now I have .73 Volts.

.73 volts corresponds to limits of about 30C-40C 
for the allowable range of resistance per the 
graph in Bentley.  At 0C it would be about two 
volts.  The sender is fed five volts through 
approx. 8130 ohms, forming a voltage divider at 
the junction which the ECU reads.  The voltage at 
that point becomes Vecu = (five volts x Rsender 
ohms) / (8130 ohms + Rsender ohms).  You can get 
the allowable range of ohms for a given temp from 
Bentley.  The ECU applies temp enrichment during 
open-loop operation/starting up to 60C, with a 
maximum of 2.5x running and 4x starting at -40C.

>New question: How does the Evaporative Emission 
>System affect starting performance?

No more than when running.  There's a 
flow-limiting orifice.  The valve is plumbed to a 
throttle body port which only gets vacuum when 
the throttle is cracked open, and there is a tiny 
(.006") orifice in the line at the throttle body 
that ensures the valve doesn't open 
instantly.  The maximum flow rate through the 
canister is controlled by a larger orifice in the 
nylon tee where the suction line plumbs into the 
aux air regulator line on the 1.9l.  The 2.1l 
drawing leaves all that out, but you should be able to trace it.

>Mike MĀ