did some diagnostic work but....
Ok guys this thread is a spawn off this idle / surging problem 88 300e .
1988 300E 130,000miles
I followed the diy article and I am sure I didn't do it all correctly but heres what I got from testing the x11 #3 hole.
COLD: 50.7% steady
Warm 60 c: 10%- 37% fluctuating throughout that range.
Held idle at 2000rpm: 35% steady
90 c: 60.6 steady
Held idle 2000rpm: 30% - 80% fluctuating throughout that range.
After a minute of the 2000rpm it stayed around 32% -38%
Let off throttle and it caught at about 1200 rpm and was around 48%
Went back to 650-70o rpm and was at 60.0% then after about 15 seconds dropped to around 15% (rough idle)
Put car in drive went straight to 60.6% stayed there for about 30 seconds then surged some and went to the 30's then back up to 60.6
Put in reverse went to 30% then back to 60.6%
One thing I did notice is that when it surges the butterfly/plunger thing on the airflow housing will fly open some. It makes an air noise thats why I notice it so much.
Hopefully one of you master mechanics can tell me if this means anything !!!!
Thanks in advance guys.