Lyle,

DON'T ADJUST THE THROTTLE SWITCH YET!!!... do yourself a favor and remove
the throttle body, and clean it out thoroughly with carburetor cleaner. On
my '85, gunk inside the throttle body was preventing the throttle valve
from closing all the way, so the idle switch was never getting tripped. I
foolishly adjusted the switch without cleaning the throttle body first, and
had to re-adjust it after the cleaning.

If you have an '85, then there is a single throttle switch, and it is
mounted under a plate on the throttle body (you'll find it if you follow my
advice and clean the throttle out). There is a test / adjustment procedure
in the Bentley, you just have to search a bit for this special single-year
throttle switch section. It's only a page or two, and it took me several
trips into the book to find it... until I did, I was as baffled as you are
by the pictures showing obvious, visible switches. Only adjust the switch
if it fails the test procedure *after* cleaning.

Also, it sounds like you've been spending a lot of time on this machine, so
I assume you've already cleaned the engine ground stud on the left head,
inspected and cleaned all the connections that go to it, made sure you have
a good solid ground from the head to the firewall, and inspected all your
vacuum lines and replaced any that are cracked, loose or collapsed. This
routine maintenance (needed by any old vehicle) is cheap, easy, and
necessary before you swap any active parts in the FI system! Bad electrical
connections and/or weak vacuum will make perfectly good sensors return
false results to the ECU.

Tim

At 09:31 PM 10/2/2006 -0700, Resiolute wrote:
>Greg,  I don't have those switches on my engine...I see them both in the
>Bentley, but none are on my engine.. it's buck naked right there...just the
>idle screw on the throttle..?  Lyle
>----- Original Message -----
>From: "Greg Potts" <greg@POTTSFAMILY.CA>
>To: "Resiolute" <resiolute@copper.net>
>Sent: Monday, October 02, 2006 7:24 PM
>Subject: Re: Surging 1.9 Vanagon
>
>
>>
>>Hi Lyle,
>>
>>Apparently the throttle position sensor switch was made with a  plastic
>>sensor that butts up against a steel adjusting screw, After a  while the
>>plastic part wears down and the assembly needs to be pulled  apart and
>>adjusted to compensate for the wear.
>>
>>At least that's how I recall Frank explaining it to me.
>>Here's what van-cafe has to say about it:
>>T
>>hrottle switch and idle control components - The throttle switch must  be
>>both in working order and adjusted correctly. With the engine not  running
>>and key turned off, you manually operate the throttle arm  back at the
>>engine and see if you hear a click just as you move the  throttle on and
>>off the idle or relaxed position. If not, then you  should attempt to
>>adjust it. The throttle switch must be adjusted  correctly so that the
>>idle stabilizer computer (situated behind the  passenger side tail light
>>housing) and idle control valve kick into  action when you are in idle
>>mode. If the throttle switch is adjusted  correctly and the idle either
>>hangs up at high rpms or the vehicle is  prone to stalling, then one of
>>those two components is likely at  fault. (Please review Bentley manual
>>procedures on testing these two  components). While you are here it's also
>>wise to check the throttle  body itself. When you grab the shaft you
>>should be able to rotate it  but should not witness significant movement
>>if you try to rock it  back and forth.
>>
>>Good Luck,
>>
>>Greg
>>
>>On 2-Oct-06, at 11:26 PM, Resiolute wrote:
>>
>>>Greg,  What kind of repair,  please explain if possible..?
>>>Lyle
>>>----- Original Message ----- From: "Greg Potts" <greg@POTTSFAMILY.CA>
>>>To: "Resiolute" <resiolute@copper.net>
>>>Sent: Monday, October 02, 2006 1:42 PM
>>>Subject: Re: Surging 1.9 Vanagon
>>>
>>>
>>>>
>>>>Hi Lyle,
>>>>
>>>>Same thing happened with my Dad's 85 sunroof the week I had it at
>>>>Buses Of The Corn. Frank Condelli was there and he was able to  make  it
>>>>better by adjusting the screws on the throttle body.  That  adjustment
>>>>made if better for a week or so but then the  problem came  back (which
>>>>he warned me about) ... it looks like  the throttle body  will have to
>>>>be removed and repaired.
>>>>
>>>></Greg>
>>>>
>>>>
>>>>On 2-Oct-06, at 3:18 PM, Resiolute wrote:
>>>>
>>>>>Greg, It's at idle...when it does it.  I'm buying another new   ground
>>>>>strap this afternoon, I had them order it for me.  I  think  most if
>>>>>not all is ground related.
>>>>>Lyle Lathem
>>>>>1985 Vanagon GL
>>>>>----- Original Message ----- From: "Greg Potts"  <greg@POTTSFAMILY.CA>
>>>>>To: <vanagon@GERRY.VANAGON.COM>
>>>>>Sent: Monday, October 02, 2006 5:37 AM
>>>>>Subject: Re: Surging 1.9 Vanagon
>>>>>
>>>>>
>>>>>>
>>>>>>Hi Lyle,
>>>>>>
>>>>>>Does the surging occur at idle or partial throttle?
>>>>>>
>>>>>>If at Idle it's a problem with the idle stabilizer circuit.  Possibly
>>>>>>a mechanical adjustment is required, or it might be a loose or  broken
>>>>>>wire.
>>>>>>
>>>>>>If at partial throttle, it's "Vanagon Syndrome", a fault inside the
>>>>>>AFM. This can be remedied by replacing the AFM or by installing a
>>>>>>patch, see www.vanagon.com for more info.
>>>>>>
>>>>>>
>>>>>>Happy Trails,
>>>>>>
>>>>>>Greg Potts
>>>>>>1973/74/75/77/79 Westfakia "Bob the Tomato"
>>>>>>www.pottsfamily.ca/westfakia
>>>>>>www.busesofthecorn.com
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>On 2-Oct-06, at 7:42 AM, Resiolute wrote:
>>>>>>
>>>>>>>One thing I forgot to mention on our 1.9 engine,  as I said we are
>>>>>>>having
>>>>>>>problems, with injectors not fireing on the left bank.  We also
>>>>>>>once the
>>>>>>>engine is warm, and after being on the road for awhile, is a
>>>>>>>surging engine.
>>>>>>>It idles down, then reves up, idles down and rev's up.. over and
>>>>>>>over...?
>>>>>>>Any ideas on that problem..?
>>>>>>>Thanks in Advance..!
>>>>>>>Lyle Lathem
>>>>>>>1985 Vanagon GL.
>>>>>>
>>>>>>
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>>>>
>>>>
>>>>
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>>
>>
>>
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