RE: [engine] idle hunting...

["Brian Wagner" <scirocco_88_16v@hotmail.com>]

Had this same problem on both the 88 16v (sold) and the 87 16v (have still), 
what I found is the following

1) the throttle body it self is carboned up (carb cleaner and spray)
2) the throttle arm was not retuning all the way and hitting the idle switch 
(clean throttle body and adjust idle switch per bentley)
3) the air idle screw oring seal was disintegrated (replace) but before you 
do spray carb cleaner in there and blow out carbon

I did these on both cars and idles went right to 950 and smooth when the a/c 
is turned on idle goes to 975 to 1000 right on the mark.

Try this it is a inexspensive fix and commonly over looked, why most pepole 
put injector cleaner and and say I good. But in reality our injectors are 
down line from the TB, doh!!!!!!!!!


Brian

87 16v
86 8v (parts car)
84 Wolfsburg (white coming to a garage near me soon)



>From: "Fry, Larry" <LEF@chem-tronics.com>
>To: danws69@earthlink.net, "roc (E-mail)" <scirocco-l@scirocco.org>
>Subject: RE: [engine] idle hunting...
>Date: Fri, 19 Oct 2001 08:56:41 -0700
>
>lifters tap....rods knock.  Sounds like you will be rebuilding the lower 
>end
>soon.
>  I've been chasing the same idle problem since I bought my "87 16V two 
>years
>ago.  If you uncover the cause, let the list know!
>
>on the same post; my in-car voltmeter reads one volt lower than my
>multimeter says the batt/charging voltage really is (e.g. 12.5V vs. 13.5V).
>Anyone got the reason/fix?
>
>Larry  sandiego16V
>
>-----Original Message-----
>From: dan [mailto:danws69@earthlink.net]
>Sent: Friday, October 19, 2001 8:18 AM
>To: roc (E-mail)
>Subject: [engine] idle hunting...
>
>
>...are there any on-line tech procedures done for this subject yet? I've
>heard some talk about an air/bypass valve? I recently had that funky 
>2-piece
>hose crap out on me, and aside from the high idle, it wasn't doing this up 
>&
>down crap.
>
>My current situation is:
>-car starts fine
>-when coming to a stop sign/light, rpms drop (alt light comes on briefly)
>rpms rise to 2000, if I don't tap the gas, it'll drop way low and die.
>
>NOW GET THIS:
>If I have the a/c on, idle is PERFECT. Luckily I'm in Florida, but
>occasionally we get nice weather...
>
>I really HAVE to fix this because of the side effects of the idle problem:
>-when it drops super-low my oil pressure drops too low and then I get a
>scorching case of lifter-knock.
>-alternator stops charging properly, it charges, but not at the level that
>it started at (i.e. 10.5~11 VDC) - (yes, I've verified my gauge by sticking
>my multi-meter on the battery terminals).
>
>
>
>Sorry for the longer-than-usual post from me.
>
>Dan
>'81 Rabbit Sport Truck
>'87 16v Scirocco
>'00 Jetta
>Tam-pa, FL
>http://home.earthlink.net/~danws69/index.html
>
>
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