idle air bypass screw

[cwass99@rogers.com (cwass99@rogers.com)]

Hi,
     I'm sure others will respond, but I don't see them yet...;)
     I don't have a Bentley yet (still, I really have to pitch a bitch at the
book seller) but I don't see what playing with your idle speed has to do with
the dwell angle.  The idle adjust screw (guessing it has the same effect as the
one in my 8v) just tweaks the idle speed.  Dwell is the amount of distributor
rotation (expressed in degrees) that the points would be closed (I could be
backwards here, it's been a very long time since I've adjusted points, bigger
points gap = smaller dwell angle, right?).  That duration of points closure
won't change if the engine is idling faster.  If there's 30 degrees (guessing
here ;)) dwell angle at 750 rpm idle, there will still be 30 degrees dwell angle
when idling at 1200 rpm.  Does your 16v even have points?  I'd bet against it,
so I'm not completely sure what the reading would mean with a Hall sender and
electronic ignition.
     I can't comment on the hoses.  Never even looked seriously under the hood
of a 16v :)

Cheers,
Colin

On 27-Mar-2002 T. Reed wrote:
> Hey all,
> 
> Well with my sticky fuel plunger being unstuck, its time for some 'tuning'
> (ooh- that sounds so ricey nowadays.) and I'm going to start with the
> idle screw on my throttle body.
> 
> I've got a dwell meter and I hooked it up to the grey/blue wire as
> indicated in the bentley.. but I couldn't quite figure out what the deal
> was. Turning the idle screw wouldn't change the dwell reading at all. Does
> the car have to be warmed up (ie. cis-e operating in closed loop) for
> this?
> 
> The picture of the crankcase ventilation hoses in the Bentley are from a
> left-hand-intake 16v and the hoses are a little different. Which hoses are
> they referring to as the ones you have to remove? The huge one coming off
> the block, obviously, but what about the small one that plugs in to the
> side of that one? There is no such hose on my car - but there is a little
> nipple that hooks on to the bottom of the cold start injector .. and the
> other end of that huge hose goes to the airbox.
> 
> What about the small hose that goes from below the lower intake manifold
> to the rubber intake boot? It seems like unplugging it would create an
> enormous vacuum leak (like what happened when I unplugged the nipple on
> the large hose going to the cold start injector fitting)..
> 
> Is it really necessary to unplug all this crankcase ventilation shat in
> order to get a good reading? Anybody know alternative methods of setting
> the idle air bypass screw?
> 
> Thanks,
> 
> -Toby
> 
> --
> '87 16v
> 
> 
> 
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-- 
Cheers,
Colin

If you can read this line, you're probably not illiterate.