Date: Mon, 16 Jul 2012 18:33:31 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: leaking fuel hoses
In-Reply-To: <20120716215956.GA780@tenma.swcp.com>
Content-Type: text/plain; charset="US-ASCII"
The fuel hose leaks are a combination of the wrong hose or clamps. This is
why they went to the spring clamps as part of the recall on the 91's.
Basically the hoses expand/contact with temperature changes and then they
take a "set" and become loses.
As for the sticking throttle switch causing a surge off idle that is it's
job. What is happening is that as engine speed increases with the switch
closed the ECU is going into fuel cut off. This is done so that when over
running the engine such as going downhill or down shifting the injectors
shut off to save fuel and prevent high intake manifold vacuum from sucking
too much fuel through the injectors. Since this makes the O2 sensor see a
lean mixture it is ignored for a short time after the throttle switch opens
or the engine goes below the fuel cut off speed.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
William
Sent: Monday, July 16, 2012 6:00 PM
To: vanagon@GERRY.VANAGON.COM
Subject: leaking fuel hoses
I have not driven my vanagon for about two months. I charged the battery
and the engine started normally. When I walked to the rear of the vehicle,
I smelled gas so I immediately turned off the engine and investigated. The
gas was leaking from the drivers side injector manifold. There were _no_
leaks there two months ago. The hoses showed no cracks and were still soft
and pliable. For grins, I tightened all of the hose clamps. All of the
hose clamps were loose. I could have tightened the screws on the clamps one
turn by hand. After snugging all of the clamps, the leak stopped.
I do not remember reading this type of experience in the vanagon list
before. Is this a sign that _all_ of the fuel hoses need replacing?
Another question. Why does the engine RPM change rapidly when the idle
switch sticks and the throttle is opened? The symptom of RPM changing had
me baffled. Every time I experienced this symptom, I pulled over, opened up
the engine hatch, and manually operated the throttle, the switch did _not_
stick. I even opened the engine hatch at home, started a cold engine, and
manually operated the throttle, the switch did not stick. After sitting for
two months, the switch was finally stuck when I manually operated the
throttle.
--
William
grateful@nmia.com
505 440 0760
Too many people spend money they haven't earned, to buy things they don't
want, to impress people they don't like.
-Will Rogers
