Got an '84 4Runner with a 22R. Went to take it through emissions last week and it failed the CO (%). Should have been 1.20 or less, and it was around 2.2 for both high RPM and idle. The tech said it was running too rich.
Took it home and started playing around and found that, #1, I am getting hardly no vacuum at the distributer. #2, the PO has drilled out the plug for the mixture screw on the car. #3, I can't get the idle to drop below 1100 RPMs.

So, I check all the vacuum lines and replaced a few that looked bad, looked for other vacuum leaks (and found none). I reset the mixture screw based on the FSM (3 1/2 turns out) and tried to adjust the idle, but it still wouldn't go down. It would go up, but not down.

So now I'm stumped. Any suggestions?

Thanks

wish my webspace didn't go down.. I have a perfect pic...


Try turning down the cold idle screw. it hides in the linkage. Sometimes the cold idle screw will hang up the entire system and make it run at a higher idle all the time..


Also, did you check your AAP? (check FSM)

Did that include checking all the vacuum diaphragms to see if any were blown?

Dave