Once more into the void...- does someone have a flashlight?

[Adam A. Luy]

Doesn't stall when oil cap is removed? It should, or at least run real
bad. Sounds like a vac leak and the car is idling high to keep from
stalling.

My $.02

-Adam

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com]
On Behalf Of Fuzzzydog
Sent: Tuesday, October 24, 2006 10:29 AM
To: quattro at audifans.com
Subject: Once more into the void...- does someone have a flashlight?

Hello all, been away for a while since I picked up a 4X4 and returned to
my offroading passion, but the 88 5KTQ avant has lured me back.
Unfortunately it is a love/hate relationship.....:(

It is a sweet car - for the most part been running very well since I've
owned it.  But recently I have developed an intermittent high idle that
is defying all efforts to fix.  I have read SJM and other sites and done
a lot of checking.  Right now I am considering different types of rope
for a noose to put myself out of my misery.  Before I go to that
extreme, I am hoping someone can point out what I have missed....

Symptoms:

MC engine, turbo, 5 speed, all stock - no mods.

starts up very well, idle a tad high but slowly starts fluctuating and
getting higher as it warms up.  go for a drive and now it won't come off
high idle - ie coming to a stop, push in the clutch and rpm stay at
about 3k.  sometimes, only sometimes, I can let the clutch out to bring
the rpm down and they will stay down right around 800. this is rare
though - usually I sit there at the stop light with the engine doing 3k
rpm.
car does not stall when oil cap is removed - even when idle is ok
always, ALWAYS, filled with Chevron super supreme - problem has
persisted over many fill ups high speed is not affected - done a
consistent 140km/hr trip recently - pulls like a freight train.
oh yeah - this might be important -  when the high idle problem is
there, and I am coasting along at any speed, if I let my foot right off
the gas it keeps motoring along (because of the high idle) BUT, as soon
as I give it some gas to speed up there is a 'dead spot' right off idle.
The car bucks a bit as if fuel or spark were shut off, then it picks
right up and away we go.  this dead spot is not there when the high idle
problem is not present (remember, the problem is intermittent)

things I have done.
checked idle switch - opened, resoldered, tested - all good replaced ISV
with one that came out of a properly working car checked for broken vac
hoses - all good that I could see checked idle controller under dash and
saw that 1 wire was broken completely apart - fixed - no love - didn't
cure the problem battery is new MFTS is brand new 3 wire swapped the
small single wire temp sensor at the top front of the engine.
checked wiring/hose connections - nothing stood out.

Willing to listen to any and all suggestions I have lots of spare parts
that I can swap out from a previously good running 5ktq sedan.

Thanks for reading and looking forward to your input.
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