Date:         Wed, 4 Jun 2014 07:57:09 -0400
Reply-To:     Robert Clemmer <n51219@COMCAST.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Robert Clemmer <n51219@COMCAST.NET>
Subject:      Fuel pressure regulator/hesitation off idle
Content-Type: text/plain; charset="us-ascii"

Ok, to riddle me this.  A month ago I was preparing for another 1,200 mile
trip to SW FL and giving the car a "once over".  I'm poking around the
engine and I find the vacuum hose to the fuel pressure regulator
disconnected. How long it was disconnected, I'll never know.  I look around
and push it back on a nipple on the bottom of the intake manifold.  Almost
immediately I notice the car hesitates/stumbles for about 2-3 seconds when
coming off idle.  That's a long time when pulling out into traffic from a
stop sign.  It almost like the old carbureted days when the accelerator pump
didn't work and it went lean after the throttle was opened until the jets
caught up the drop in vacuum. Once going it drives normal in every way.
Nothing has changed.  Fuel mileage is that same as it has ever been.  Three
weeks later, I have enough of this and I disconnected the vacuum line and
drivability goes back to normal.



Any ideas as to what is going on here?  Is there any long term harm to
leaving this vacuum line off?  Car is a young 91 2.1 wbx automatic.



BobC

Perkasie, PA