I swapped out my ignition coil with a known good one with no real change in starting behavior.
With my fuel pressure gauge installed and my remote starter switch, I observed the following:
Key ON, fuel pressure is 36 psi.
Engine running at idle, fuel pressure is 32.5 psi.
Engine running at 2500 RPM, fuel pressure is 28 psi.
I'm wondering if 36 psi with the Key ON is too high and making the mixture too rich?
Mike M 

    On Monday, November 14, 2016 12:55 PM, pcking <pc.king@comcast.net> wrote:
 

 
Did you check the coil when it's hot? That's when they start to fail.

----- Original Message ----- 
From: "Michael Magnani" <mfmagnani@SBCGLOBAL.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, November 14, 2016 3:20 PM
Subject: Re: 2.1 WBX Warm Start Troubles

Here's an update on my 2.1 WBX warm start troubles.Per Dennis Haynes 
suggestions, I checked the ground connection of the Temp 2 Sensor. It reads 
a steady .5 Ohms.Also per Dennis, I inspected my ignition system components. 
Spark plugs show a nice tan color with no fouling. Cap and Rotor and Spark 
Plug Wires are less than a year old and look perfect. Both sides of the 
Ignition Coil read greater than 4K Ohms.Per Stuarts suggestion, I double 
checked my new Fuel Injectors. They hold pressure for 10 minutes and there's 
absolutely no evidence of dribbling gas when I stop cranking the engine 
over.What am I missing?Mike M

    On Thursday, November 3, 2016 6:28 PM, Stuart MacMillan 
<stuartmacm@gmail.com> wrote:

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div.yiv6378519244WordSection1 {}#yiv6378519244 Good luck, I hope you find a 
leaking injector, or I’m at a complete loss. Stuart From: Michael Magnani 
[mailto:mfmagnani@sbcglobal.net]
Sent: Thursday, November 03, 2016 12:08 PM
To: Stuart MacMillan; vanagon@GERRY.VANAGON.COM
Subject: Re: 2.1 WBX Warm Start Troubles I just checked the ground at the 
Temp 2 Sensor. It's a solid .5 Ohms at the Brown Wire and I have 5.1 VDC at 
the White wire. Now I"m going to check my new fuel injectors per Bentley 
24.56 Mike M On Tuesday, November 1, 2016 3:45 PM, Stuart MacMillan 
<stuartmacm@gmail.com> wrote: Mike,

You say "the Fuel Pressure Regulator works correctly.But....The residual 
fuel pressure test was unsatisfactory until I clamped off the fuel injector 
hoses.The new fuel injectors behave the same."

If pressure isn't held for 10 min you have an injector fuel leak, which is 
proven by clamping them off. It must be one or more of the new injectors 
that's at fault. Pull them one at a time and check for spray pattern (per 
Bentley) and then for leaks by waiting 10 min between tests. That fuel is 
going somewhere, and I sure sounds like it's going into the cylinders.

Stuart
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of 
Michael Magnani
Sent: Tuesday, November 01, 2016 1:38 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: 2.1 WBX Warm Start Troubles

I apologize for the above format.
It looked proper when I sent it.
It was much more readable on my end.
Sorry,Mike M

On Tuesday, November 1, 2016 1:32 PM, Michael Magnani 
<mfmagnani@SBCGLOBAL.NET> wrote:

My van has trouble starting when warm.The fuel mixture is too rich.I have to 
depress the gas pedal to open the throttle plate to get enough air so it 
will start.After it starts it stumbles for a few seconds until it clears the 
over-rich condition and then it runs perfectly.
1990 2.1L WBXManual TransmissionShoebox Electronix 8691V ECU MonitorGood 
BatteryGood StarterGood Cranking SpeedGood GroundsNew Fuel Lines and 
HosesGood Cold Starting (Starts Immediately)No Other Running or Performance 
Problems.Swapped out the Oxygen Sensor with a known good one.New Air 
Filter.New Fuel InjectorsNew Fuel Injection Temperature SensorNew Air 
Temperature SensorNew Throttle Position SwitchPer Bentley 24.55, the Fuel 
Pressure Regulator works correctly.But....The residual fuel pressure test 
was unsatisfactory until I clamped off the fuel injector hoses.The new fuel 
injectors behave the same.
I'm looking for guidance.Thanks Mike Magnani