Well Tony, you have inspired me to get get off my butt and fix this problem on my SE. Been living with it for a year now

I'm thinking this is a lambda problem. Like the car is in "lambda limbo." Something is hanging up when the systems electronic control comes into play. During this time the incorrect amount of fuel is being metered. Just my theory, and I am open to all suggestions.

Can someone explain exactly what happens during this transition (open to closed loop)?

A question Tony- Do you experience this problem when you first run the car during the day and it gets to about 60degreesC? I get a weird surging on the road for about 45 seconds.

Mike

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E