Some tuning questions, likely should be 2 threads...

[lord_verminaard at yahoo.com (Brendan Doyle)]

Step 1:  Immediately remove all CIS-E components and sell them on E-bay.  
Step 2:  Install Megasquirt.  (you should be a pro at that MS stuff now, right Cath?)

Just kidding.  Sorta.

Um.....  Injector flow rates?  That's what you told me about my CIS-E madness.  ;)
Re-adjusting the sensor plate will probably throw out your settings at idle, but it should be no big deal to re-adjust.  Either way if it's only off by a little, it should not make that much difference in how the car runs.

Some things (oddball things) come to mind- Ignition module?  I.E. the "Telefunken" unit mounted in the raintray.  I'd be willing to bet you have a few of these laying around, (or anyone with a VW nearby might at least) go ahead and swap them and see what happens.  It might be ok at low rpm's but at upper rpms it might be getting weak at high temps due to electron migration.  (it happens with PC's all the time!)

On the more extreme side of things, camshafts worn?  Weak/worn out lifters?  Saggy valve springs?  Highly unusual items to fail, especially on a VW, but stranger things have happened.

Does the car have a Catalytic converter?  If so, get it nice and warm, then bang on it and see if it rattles.  Maybe you have a bad cat.

I'd try the *easy* CIS stuff first, maybe even switch out your A/F gauge into the 16v real quick and go for a few rips down the street and see what it does at the upper rpms.  

That's all I got  :)
Good luck.

Brendan

----- Original Message ----
From: C Boyko <roccit_53@xxxxxxxxxxxxxxxxxxxxxxx>
To:  Jeff Toomasson  <area53@xxxxxxxxxxxxx>
Cc: scirocco-l@xxxxxxxxxxxx
Sent: Tuesday, July 17, 2007 12:56:31 PM
Subject: Some tuning questions, likely should be 2 threads...

Okay, this is for both of mine, and they're pretty different. 

First, her "silver spitefulness", my CIS-E 16V. She's got no big running
issues, she idles well etc, but she's too slow. I'm mucking around with the
usual stuff, new fuel filter, cleaned the K&N, new plugs, cap and rotor,
oil and filter, and so forth, mainly because she's due anyway. I had
previously checked DPR, it's fluctuating around 5.5 or 6mA, which should be
slightly rich. I haven't checked ignition timing yet (did it like last
fall), but have verified that I am in fact using the right flywheel timing
mark, it's so hard to see on 16Vs, and I'll check it shortly. I just did a
compression test on her (cold), and figured I'd repeat it on a warm engine
if there were any concerns, I got 182/182/186/181 so I'm not doing it over,
that's probably not a concern from the looks of it. I also checked that the
throttle switches are activated with the pedal matted, that all looks fine.
I'll check electricals on that if needs be, but it tested out fine when I
checked it recently.

So, back to basic stuff, finally here's my question: airflow rest plate
position, it's low by a few mm, I noticed this right after I did the fuel
filter and figured I'd verify that it really WAS low with pressure in the
system and in fact it is. How badly will adjusting this throw off the
mixture at idle? I guess I'll find out eh? Just wanting to rule out any
engine bay issues before I look into other possible causes and put hubby on
a diet...

Next question, for my MkI on MS, regarding analog outputs on my Innovate
wide band... so my AFR guage is not working at all, it did work briefly
then stopped working. I checked in the Innovate programmer software, and it
shows the right voltages for the two outputs. The MS AFR guage isn't
reading quite the same as the Innovate controller, it's off by a few tenths
(which may be a delay setting somewhere that I have yet to find). I did a
fresh air recalibration, no change. Right now it reads very rich at idle,
and the car is very rich, so I guess it's basicly working. Anyway, how's
THAT for on topic? :P
Cathy


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