Rough idle with aircon engaged
 

84 300DT, 302,000 miles. Just did my first valve adjustment. At the same time I cleaned the banjo fitting for the ALDA, disconnected the egr valve and plugged the line and secured the air cleaner.
Now I seem to have a rough idle with air conditioner engaged. It shakes the air cleaner, disengage OR add throttle and it smooths out. It drops from about 800 rpm to about 750 engaging the air con and the oil pressure drops a bit too.
Did I cause this? I did not notice it before. I tried reengaging the EGR valve and it seemed to make no difference.
Also, is there one thread that shows just what is OK to remove besides the EGR valve?
Thanks,

Mine is an 84 Federal car. If the EGR is removed there would no longer be a need for the 2/3 way (white plastic) valves that mine has on the Valve cover (since they control the vacuum to the EGR) and I guess that there would be no need for the Vacuum connector and the tubing that goes to those valves. You could do some plumbing to simplifiy the Vacuum tubing.

Should I open it back up and recheck the valves?

While I do not see how the A/C on and rough idle could be related to the Valve Adjustment; for the loss of some time to recheck the Valve Adjustment you could eliminate that as a source of the problem.

You would at least know for sure it was not the Valve Adjustment.

I do not know enough about A/C in Diesel or Gas Cars even to guess what culd be the cause of the rough idle.

Thanks for info. Found the pipe under the air cleaner not aligned with hole. Runs fine now. I've been searching for a long time in the forum and haven't found one place with the info on what I can disable on the emissions equipment on a 617. Is there a thread I am missing?
thanks

The only Emission Equipment that mine has is the EGR and the Breather/Blowby tube to the Air Filter.

I do not know if your Year and Model have one but some have a Trap Oxidizer (mine does not). There is a thread on replacing it with a "Test Pipe" that was custom made.

Nothing else that I can think of that is emission related.