Horrible running 8v

[fahrvegnugen at cox.net (David Utley)]

> 
> From: Spewey <spewey@comcast.net>
> Date: 2004/08/26 Thu PM 09:47:26 EDT
> To: Jason Peters <nefarious@drumatix.net>,   scirocco-l@scirocco.org
> Subject: Re: Horrible running 8v
> 
> Jason Peters wrote:
> 
> > Hello everybody,
> > 
> > I'm pretty new to the 'rocco list so excuse me if this is an easy 
> > question/fix.  First a little background: '83 'rocco 8v on CIS
> > 
> > I replaced the O2 sensor with a nice new one, connected it and fired
> > it up.  Seemed to run fine for the first few minutes(maybe till the
> > sensor warmed up) after that the idle started to hunt around up and
> > down.  Backed out of the drive way and the car would barely go.
> 
> Welcome!
> 
> 1. Those one-wire sensors only warm up from exhaust heat.  Three-wire
> sensors have a heater in 'em. Ones would perform worse when cold if
> everything else is good.
> 

Not so...  The ECM does not use the signal from the O2 until after warm-up.  BTW, the only reason there is a heater in the 02 is so that it will be a cleaner-burning engine, purely for emissions standards...  A properly tuned CIS system will run fine, all the time...  I think you have fuel pressure problems, more than likely from the warm-up regulator mounted on you block.  You won't know that until you check the control and system pressures both hot and cold...

My .02,
   David


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