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CIS-E fun, facts, foibles, follies and fuestions



I had a bad potentiometer once that drove me nuts.

On 4/19/07, Rave Racer 77 <raveracer77@yahoo.ca> wrote:
>
> I think I'll try the same thing.  I've got this fox that I've swapped 4
> fuel
> modules, one from the 16V just to see.  Still confused.  The 16V one
> worked
> best but was way way rich.  The stock one is popping like it's bad timing
> and the 8V Jetta one was just to lean.  I just want it to run good enough
> to
> beat on.  Everything else is golden.
>
>       Rave Racer
> Current:
> '91 Jetta GLI 2.0L 16V
> '81 Scirocco Mk1 1.8L 8V Digifant 2
> '86 Fox
> 2 GTI parts cars
>
> Gone:
> '89 Jetta 1.8L 16V GTX
> '87 Audi 4000 Quattro
> '72 Triumph GT6
>
> http://spaces.msn.com/raveracer77/photos/
> http://www.myspace.com/rave_racer
> ___________________________________________
> ----- Original Message -----
> From: "David Brown" <sharpshooter33@roadrunner.com>
> To: "scirocco scirocco" <scirocco-l@scirocco.org>
> Sent: Thursday, April 19, 2007 20:39
> Subject: Re: CIS-E fun, facts, foibles, follies and fuestions
>
>
> > My moneys on the exhaust going bad now.  That's always been my luck with
> > fixing something...then something else goes wrong.
> >
> > Interesting stuff though...made me wanna go out and sand down my
> > connection to the coolant sensor. I've been fighting the same type
> running
> > problems and I've just been too busy messing with other stuff to get out
> > and work on it.
> > David
> > ----- Original Message -----
> > From: "Nate Mellom" <doubt@inwave.com>
> > To: "Scirocco list" <scirocco-l@scirocco.org>
> > Sent: Thursday, April 19, 2007 11:27 PM
> > Subject: CIS-E fun, facts, foibles, follies and fuestions
> >
> >
> >>A little history.
> >> I bought my '88 16v in October 2005 from some poor soul who dumped
> $1500
> >> at a local import shop to get his car running correctly (I have
> >> receipts). New distributor, timing belt, fuel distributor work, etc,
> etc,
> >> etc.  He sold it to me for the princely sum of $800.  The issue?
> >> Stumbling, stuttering and a complete lack of power during acceleration.
> >> It was barely drivable.  It got worse as the humidity went up.  I
> played
> >> and tinkered with it for months, new O2 sensor, made up a nifty DPR
> test
> >> rig, checked timing, but nothing.  When I checked my mixture, I'd get
> >> either 0.00 or 9.99mA.  I never got an honest number. Eventually I
> >> adjusted something (still not sure what worked), and it actually ran
> well
> >> enough to take on DD status.  I knew it was running WAY rich, I was
> using
> >> fuel like mad, and it stunk, and sometimes it was a little smoky.  A
> few
> >> months ago I swapped in a new cap and rotor, and the humidity-related
> >> stalling and stuttering cleared up.
> >>
> >> Last week, I had it in for my favorite VW/Audi gurus to do wheel
> >> bearings, and for shits, I asked him to check my mixture (I still
> hadn't
> >> gotten a real reading).  When I picked it up, he was floored, even HE
> >> only got 9.99mA.  He told me he could play with it, do a pin test (per
> >> Bentley), he figured there was a broken wire somewhere, SOMETHING to
> >> explain the high reading.  He did play with the mixture, and was going
> to
> >> fiddle with it more, but I had to take it home.  It was like day 1
> again.
> >> Stumbling, hesitation, hunting idle, and it would usually drop low
> enough
> >> to stall at a stop.  Got it home, played with mixture and idle settings
> >> until I thought it I got it right, took it to work the next day, same
> >> thing, a little better at best.  Got home, broke out the Bentley, found
> >> the CIS-E electrical test section, and went bananas.  I tested
> everything
> >> I could with one person (a few tests required cranking and testing),
> and
> >> found what I thought was a bad reading for the coolant temperature
> sensor
> >> reading.  Should be (x ohms @ x *c).  It didn't seem right for the
> >> temperature of the engine.  I pulled the wire off the sensor, sanded
> the
> >> connector all nice and shiny, plugged it back in and... Shit! A real
> >> reading!  And, it even matched what it should be, based on the chart!
> >> Well, now we're cooking with gas!  So, I get back to checking for the
> >> magical 5mA.  Sure enough, 5 or 6 turns clockwise, I actually got a
> >> reading, then a range!  Dialed in 5, got my idle smooth and consistent,
> >> and whaduhyaknow?  The thing runs like a freaking top.
> >>
> >> Lesson learned?  Check over everything, twice or thrice if need be,
> >> eliminate possible issues, and you'll have a good chance of finding the
> >> problems.
> >>
> >> Now, some questions.
> >>
> >> Someone posted on a VW forum a very good write-up on checking mixture
> and
> >> idle, and it helped me greatly.  At the end, he wrote to enhance
> >> performance in mid-range RPM power (4000 on up), to richen the mixture
> to
> >> about 2.5mA.  Is it a good idea?  Will I see results?  With the proper
> >> mixture it seems a little soft now, it seemed to have more zip when it
> >> was ear-tuned, so maybe?
> >>
> >> My exhaust note seems louder now, since things are right.  Could this
> be
> >> because of the proper settings, or is my exhaust just failing, and
> >> they're just happening at the same time?
> >>
> >> Sorry for the novel, my longest post in a long time.
> >>
> >> Nate
> >>
> >>
> >> _______________________________________________
> >> Scirocco-l mailing list
> >> Scirocco-l@scirocco.org
> >> http://neubayern.net/mailman/listinfo/scirocco-l
> >>
> >>
> >> --
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> 4/19/2007
> >> 5:32 AM
> >>
> >>
> >
> >
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> >
>
>
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-- 
Sean
A-1 x 2