[Kemo]

I just tested my pressures on my 78SC with the Pelican CIS pressure test kit. Its a good piece of equipment it seems so I followed the instructions as best as I could. I also have an LM-1 for the A/F mixture readings. I have a warmup issue where the car fires up from cold and runs high idle like up to 2K then after about a minute drops to below 900k and chugs. I have noticed that the LM-1 shows a lean mixure during this time. then after about 5 minutes, the idle smooths out and everything is great. I have checked for leaks and adjusted the timing to 5deg BTDC. Right now, I have to run the A/F rich at about 12.8 when fully warmed up to minimize the warmup issue.

I hooked everything up and made sure I had the valve on the correct side according to the instructions, with the hookups between the WUR and the Fuel Distributor. I started the car and then recorded pressures every minute and here is what I got as far as data.

754pm -- started motor, 2.2bar air fuel at about 13.0. This pressure rose to 2.5 in about 20 seconds and climbed to 2.7 after about 30 seconds. still had high idle which is the norm

755pm -- 3.3 bar, engine still running ok..high idle air fuel 13.3 or so

756pm -- 3.3bar, idle comes down to 800 and engine starts sounding like its going to die, airfuel ratio lean at 14.2, I have to manually adjust idle screw to get rpms back up to 1K. This is what I would like to fix.

759pm 3.3 bar, idle starts to clean up and rise just a bit and A/F starts to come back to 13.7

802pm -- 3.3 bar and idle is pretty good but high at 1250k air fuel is now comming down to 13.3, I manually adjust the idle back down to 1k

805pm -- 3.3 bar and idle is great A/F is at about 12.8 and this is how it stays, I adjust the idle down to 950 and all is well.

So then I turn the engine off and monitor the pressures over a 20 min time frame

816pm 2.2 bar
817pm 2.0 bar
818pm 1.8 bar
819pm 1.7 bar
820pm 1.65bar
821pm 1.6bar
825pm 1.5bar
837pm 1.2bar

At this point I turn the engine back on and let the idle stablize and turn the valve on the CIS tester kit and the pressure climbed to 4.8 bar. This made the engine run kinda rough but it didnt stall.

Im not sure what to make of all this. I recently replaced the filter and the accumulator as these were easy to address. I am a bit concerned about the lean mixture on warmup and I would like to run my A/F at 13.5 or so when fully warmed up. I think this would translate to 5% CO which is what I think is recommended.

Thanks for any help on this...