Hey Guys,

Just wanted to pick your brains on this problem. First off the car in questions is a 1989 420SEL (FED CAR) and has about 255k miles on it.

A friend wanted me to look at it and see if I could find out why the CEL light is on and why it was sluggish in performance. I started out by checking the duty cycle and it was 100% or .08V at X11 pin 2-3. Looking over section 07.3 of the MB manual it says to check the O2 sensor. Since the owner couldn't remember when it was replaced, I replaced it with a Bosch replacement. The light is still there, the performance is still somewhat sluggish. I checked the Air flow potentiometer and found no voltage present at pin 1-3 or 2-3. I can unplug the connector at the potentionmeter and the idle does not change at all. Also, there is alot of fuel present in the mixing bowl. It looks like someone has been messing with the idle control screw and the CIS injection looks to be replaced. The OVP was checked as well, no rattle and the fuse is good. I have checked the grounds at W10 and W11 location. It looks like it may be the CIS-E control unit. Does anyone have any other suggestions or a good CIS-E Control unit I can use to test or where to purchase rebuild one cheap?

Thanks.

__________________
Chris

2000 S500 (SOLD)
1985 300DT (CA model) 113K Miles (SOLD)
1989 300SE 47K miles (SOLD)
1998 VW Jetta MK3 TDI (Totaled)
2006 VW Jetta MK5 TDI