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

[JOHN SHERROW]

I don't think the car can "idle" at 3000 rpm.

I put idle in quotes because at idle when the TPS is closed the decel valve
should kick in if the RPM's are above 1500 rpm. This creates the cycling
idle some people complain about when the idle goes awry.

I'd say the throttle switch wiring is kaput.

Does the idle stay at 3000 with the ISV unplugged? I read awhile back that
some one replaed the control module and solved a similar problem. Based on
what I've read about the decel valve the solution did not make sense to me.



----- Original Message ----- 
From: "Adam A. Luy" <Adam at RoutersInc.com>
To: "Fuzzzydog" <fuzzzydog at gmail.com>; <quattro at audifans.com>
Sent: Tuesday, October 24, 2006 1:57 PM
Subject: RE: Once more into the void...- does someone have a flashlight?


> 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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