Well a simple but foolproof way is to look at the spark plugs ...if you're
running rich then they'll be dark brown.  If  they are white'ish ...your too
lean.  A very pale brown is correct.
Take a look at a haynes manual ..for any car...they have a nice colour photo
showing the different colours to be found.  his is actually a very good
diagnostic method.

Remember to look at all the plugs because it's possible to be runnign rich,
lean or burning oil in different cylinder for example due to air leaks or
engine faults.

Steve

----- Original Message -----
From: "Chad" <groch@WORLDCHAT.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, March 17, 2001 8:50 AM
Subject: Engine Running Rich??????

> How do you tell if the engine is running rich?? I know I've had some O2
> sensor related problems and I'm not completly sure if my thermostat works
> (bought the van in the winter and its still winter).
> thanks,
> Chad 85GL