Cis Questions
 

I recently bought a 1981 sc with about 50,000 miles. Runs great most of the time, however I have a couple of questions:

1. When it's first started it idles pretty high, around 1800. Then as it warms up it starts oscilating between 900 and 1800. This goes away after its driven for a few minutes, then it idles around 800 or 900. Is this normal?

2. If I drive the car to the store or where ever and leave it parked for 30 minutes - 1 hour it starts up but will stall if i dont give it some gas. It will continue to stall if i let the rpm come down too fast at a light. But will stay running if i slowly let the rpms fall. I know this isnt right but i'm not sure what it is.

here's a pic


http://forums.pelicanparts.com/uploa...1088546771.jpg

Sounds like the WUR (warm up regulator), but Hey, what do I know!?

i vote WUR reg too!

get the CIS tester gauges, and we can find out for sure.

damn nice car. lovin the 81SC lately!

What the others said, plus your mixture may be too rich. This could be because of the WUR, or it could just be set wrong.

Paul

I had a simular problem, adjusted the mixture about an 1/8 turn ( if that)counterclockwise and it went away after a couple of days of hard driving.

thanks gus, ill try that

WUR cold control pressure is off. And, your idle mix is off.

thanks to everyone who responded, it seems to have been the mixture, and with 1/8 turn ccw no more stalling.

Run some chemtool B-12 in you tank a few times. It will clean up the fuel system. Make sure you don't have any rust or garbage in the tank. The WUR is also a good place to start.