Date:         Sat, 13 May 2000 13:22:11 -0400
Reply-To:     Tom Moritz <tmoritz@BMI.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Tom Moritz <tmoritz@BMI.NET>
Subject:      Hesitation with acceleration
Content-Type: text/plain; charset="us-ascii"

I would appreciate some assistance in diagnosing a problem we are having
with our 90 Westy.  We recently had the engine rebuilt due to a broken
cylinder head stud.  Then engine runs great except for a hesitation when
accelerating.  The problem is most evident when pulling away from a stop
light or stop sign.  I sometimes feel it when I'm accelerating in traffic.

Here's a decription of my perception of the problem.  I'm stopped at a stop
light and it turns green.  I'm a gentle driver so I depress the accelerator
peddle 1/8-1/4 full travel.  The car just rolls forward as though I've
released the brakes but not given any gas.  Then 1-1.5 seconds later the
car will start to respond to the accelerator input.  Full accelerator input
results in normal rapid vehicle acceleration for that pedal position.

I have the following suspicions and would appreciate any feed back on these
or other possible causes:

1) My airflow meter is failing and the vechicle is accelerating when the O2
sensor corrects the mixture.

2) The bypass on the airflow meter is not set correctly.

3) I have a bad temp sensor (though this problem appears to be independent
of operating temperature.

4) Others?

Thank you for any assistance,

Tom Moritz
***********************************
*                                       *
*       From the computer of:   *
*           Tom Moritz          *
*                                       *
***********************************