16V Problems... Part 18 - Please help an idiot...

[rhock99@epix.net (Ryan H)]

This makes perfect sense for the electronic advance, Brian, but why would my vacuum advance be held back?

> 
> From: "BoxOParts" <bhonnold@pac-cap.com>
> Date: 2002/10/20 Sun AM 11:21:59 EDT
> To: "Ryan H" <rhock99@epix.net>
> Subject: RE: 16V Problems... Part 18 - Please help an idiot...
> 
> Only a couple things throw a cis-e car into limp home mode. ie no timing
> advance.
> 
> I would suspect a failing or corroded temp sender, check the connections.
> Also, check the operation of the idle switch on the throttle body to make
> sure that the knock computer knows when it's on or off throttle.  Lastly
> check the connections at the knock sensor.
> 
> The system ONLY goes into limp mode if the temp circuit and/or the knock
> circuit provide no feedback to the knock box.
> 
> Brian H
> 
> 
> -----Original Message-----
> From: scirocco-l-admin@scirocco.org
> [mailto:scirocco-l-admin@scirocco.org]On Behalf Of Ryan H
> Sent: Saturday, October 19, 2002 10:57 PM
> To: scirocco-l@scirocco.org
> Subject: 16V Problems... Part 18 - Please help an idiot...
> 
> 
> If you don't want to read this whole thing, please at least read my last
> paragraph.  I need help!
> As many of you may know, I've been having problems with my car going into
> "limp" mode, where I have no power from the timing being retarded... Well, I
> did some experimenting tonight and pulled the vacuum line that goes to the
> knock box controlling vacuum advance (I know, probably a bad idea).  Anyway
> here's what I found:
> 1.) The car still goes into limp mode, although it's not NEARLY as bad, and
> when it runs normal, it's MUCH faster than before, telling me the timing was
> ALWAYS being retarded some.
> 2.) The car spits out alot of smoke @ WOT according to my buddy - could I be
> running so rich that it's retarding my timing?  My Scirocco never seems to
> use any gas, though.  Anyway, running rich wouldn't affect vacuum advance,
> would it?
> 3.) Obviously, my electronic advance is getting a bad signal too, since it
> still had low power.  Could my engine really have a problem?  Everything
> runs normal, but why would vacuum advance be a problem?  Isn't that just
> vacuum from the head?  Could my oil pressure be going so high or low that
> the vacuum advance gets a bad signal, and also causes the electronic advance
> to get a bad signal too?
> 4.) Could leaving the vacuum line from the engine open (oops, forgot about
> that) be causing the electronic advance to go wacky, and my problem is
> simply a vaccum leak (I wish)?
> 
> OK, let me sum up my question... Why would BOTH my vacuum and electronic
> advance on the knock box be getting bad signals?  It's definitely not the
> knock box, since it runs much better with vacuum unplugged.  New knock
> sensor, too.  What parts are responsible for the car running in open vs.
> closed loop mode (so I can test more)?  O2 sensor, coolant temp. sensor,
> DPR, and ????
> 
> This problem is getting annoying, especially now that I've tasted full
> power.
> 
> 
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