Don

        You Really Need to get that Crack Fixed ~ AnyTime you have performance Issues

with an Engine & you also have a KnownFault that could be contributing to the Issue it

is wise to eliminate the KnownFault before you attempt to get in to the Diag' ~

                                                        ORR ~ DeanB

On 16 Jun , 2014, at 9:21 AM, Don Hanson wrote:

> On Mon, Jun 16, 2014 at 7:41 AM, Larry Alofs <lalofs@gmail.com> wrote:
> I'll second what Mark said.  Typically after driving for an hour at steady
> hiway speed, vanagon syndrome causes the engine to start to cut out for a
> heart stopping moment or two, while driving.  Some times it gets worse,
> sometime it clears up, especially if you change speeds.
>   Since your problem is at idle, I would first suspect the idle switch.
> There should be two wires leading from it to a connector nearby.  If you
> disconnect it there and test with an ohmmeter you should get some useful
> info.  Set the meter to the lowest resistance range.  It should read close
> to zero if you hold the leads together and some meaningless reading when
> they are not touching.  Connect the leads firmly to the wires from the idle
> switch and move the throttle away from the idle position and back.  The
> switch should conduct electricity every time the throttle is closed,
> reliably, whether closed gently or snapped closed.  The switch should not
> conduct when the throttle is move a little off the idle position.
> 
> Good luck,
> Larry A.
> 
> 
>   Thanks,
> 
>   I have noticed a very slight hesitation sometimes when I resume throttle
> after a downhill....the motor seems to be bogging a little just for a
> second and then it catches and resumes normal running..This often happens
> at the bottom of a gully after I have been off the gas for the downhill and
> need to resume throttle for the uphill...
> 
>   Maybe I should just replace that switch, if I can determine exactly
> which type I need and get the correct one...Every other part in the system
> has been replaced and the older parts are living under my rear bench as
> "iffy" spares, but I haven't swapped that throttle switch and it may indeed
> be faulty.
> 
>  What exactly does a "throttle switch" do?
> 
> Ahh!  , another clue is that the engine/exhaust has been increasingly
> 'popping' out the exhaust pipe on 'drop throttle', especially as the
> vehicle is first started up but sometimes even when full temp.  I have been
> thinking this popping is due mainly to an exhaust system crack near the
> head pipe junction...but now that I think on it, there has to be excessive
> fuel being drawn through the motor in order for it to ignite in the exhaust
> system and cause that popping...and if the throttle switch does what I
> think it does, it should be cutting the fuel off when the throttle is
> closed, yes?