Need Help on CIS A/F & Idle adjust - Page 2

rjm65 · 06-17-2009, 08:13 AM

They show the o-ring floating in space in the diagram, but it actually fits on the base of the fuel distributor. It sits just above the nut you removed to take the tab that keeps the plunger from falling out.

I have a bunch of these o-rings left over too, and since I'm just across town from you, you don't need to up David on his kind offer...... unless he wants to hand deliver it and it's his excuse to visit San Diego!

MPDano · MPDano's Garage

Ok, I never removed that tab, I just bent it back so the plunger would drop out.

Here's an update. My car had PTSD (Post Stress Syndrome Disorder) when I last ran it a few days ago. Last night I went to start it since I like to make sure my CIS stays nice and clog free. Anyways, it started up fine, went to high idle per the AAV.

Warmed up and idle went to about 900, I threw it in gear to see if it would start loping. Guess what? It held steady at 400. Put it back in Park, gave a few revs to see if I still had the hesitation, revs right up with no hesitation. Went for a test dive and she drove fine and even at stop lights, it help a nice even idle.

Pulled back into the driveway and put it in Park, idle was a little high, but nothing I can't adjust down. My car is possessed. I am not touching my Fuel Distributor again. All is good.

DPW928 · DPW928's Garage

Idle speed is not a good indicator of correct A/F mixture. There are two ways to properly set the mixture, one running and one static. Running adjustment is with a warm engine. Then you turn the adjustment CCW until the engine starts to falter, mark that point then slowly turn CW until the engine falters and mark that point. Next turn the adjustment to a center point between the two marks. To be on the safe side I move the center point about 3 degrees rich (CW).

The static method requires two persons. Remove the fuel pump relay and jumper the 15 and 30 connections. Adjust the A/F mixture to lean then have the second person turn on the ignition (not cranking). When the pump is running slowly adjust the mixture to rich until you hear fuel going through the injectors. Once you hear the fuel, turn back (CCW) the adjustment until it stops, turn the key off and reinstall the relay. A word of caution. If you let too much fuel go throught the injectors it can hydrolock the engine.