I almost hate to do it, but I have to agree with Terry on this.  I went
through almost the same deal.  After adjusting the TPS several times I
finally figured out that it wouldn't hold the adjustment and I replaced it.
Roland just flat scoots off the line now (hey, speed is relative).

If you replace the TPS get the plastic cam that goes on the throttle shaft as
well.  Both Bus Depot and Vanagain have them.  They tend to wear down and are
pretty cheap.  I noticed on mine that the TPS tends to function more
consistently when it is set to the wider end of the recommended range (.004").

While you're poking around the engine make sure that the intake boot is tight
on both ends and check the vacuum hoses, breather hose, etc., for cracks or
looseness.

Chuck
'85 Wolfsburg Westy -- 'Roland the Road Buffalo'
In a message dated 8/25/01 9:36:09 AM, LISTSERV@GERRY.VANAGON.COM writes:

<< Date:    Sat, 25 Aug 2001 09:25:36 -0500
From:    Terry Kay <CTONLINE@WEBTV.NET>
Subject: Re: hesitation

Stephan,

I'll bet a quart of oil, that your hesitation problem is directly
related to your throttle positioning switch, being out of wack----

Where would I come up with this revolation?

Mine did the exact same thing for months----replaced every switch,
sensor, AFM, filter, plug, wire, and other electrical sundries, and last
but not the least, I got to the TPS, and this was the little bugger
causing the hesitation.

I tossed the old---bought new, adjusted it--- and guess
what------eureka!!!!

The van moved when I hit the throttle.

Try adjusting the TPS first, then replace it if things don't
change---the contacts may be shot.

Later,

            ______________
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Terry--
74 Campmobile- (Clementine)
85 GL- (Delilah)
86 BMW 325 ES- (Eva)
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