I went ahead and preformed two more tests for a total of three to try to get the cold start better. All three tests were stone cold starts. My goal was to lower the CO% at warm up while raising the warm up idle hopefully to 1100.
My baseline stats were as follows:
-Cold idle 600-700rpm (idle never was higher)
-CO started at 6% and immediately climbed to 11%
-Over a 4 minute period the CO dropped to 1.5-2%
-Drove car for final warm up and ended with a 4.0% CO with idle 600-700rpm
Test #1
I removed the two shims under WRD in hopes of leaning out the fuel mixture during warm up. Started cold and saw no difference in baseline.
Test #2
With the WRD oval shims still removed I added a 1.15mm shim UNDER the air slide valve in the WRD. See picture below. Started engine cold.
-Cold idle 600-700rpm
-CO started at 6% and SLOWLY climbed to 11%
-After 4-5 minutes I didn't see any change in CO. I assumed that I messed up and maybe the air slide valve got stuck or something. I ended the test.
I then took apart the WRD and found everything working correctly. As I later found out, the time before the CO to start to drop was much longer.
Test #3
I decided to try a smaller shim under the air slide valve in the WRD. I went with a .85mm shim.
-Cold idle 600-700rpm
-CO started at 6% and SLOWLY climbed to 11%
-I decided to wait a while for this warm up to see if it would eventually come down. It did. It was noticeably longer than the baseline.
- Idle started to rise to 1000rpm over a long period of time.
- The CO eventually came down to 2.5% with an idle of 1000rpm. I had to rev the engine a couple of times and it finally dropped to 650 -750rpm.
- Went for a drive and the CO retest was 4.5%
During the Test #3 drive I noticed that the car started missing a little again on hard acceleration suggesting it went a little leaner over all ranges. Removing the oval shims and adding a round shim under the air slide valve would make mixture leaner but I thought it was only supposed to affect the warm up mixture.
I found it interesting that none of my tests affected the CO during warm up. The biggest difference seemed to be time.
I really wish I knew what the CO% was at cold start for a properly tuned car. For all I know it really is supposed to be 11% and I am looking in the wrong place. Please jump in if you have the answer
At this point, I have come to a dead end unless somebody offers a suggestion or another test to try. It just might be that I can't compensate anymore for a worn pump. If not, I think I will call it day and just be happy what I have.