Engine Shaking at Idle

Bosch 0 280 100 100

Not original to the car. Never adjusted. No vacuum leaks. Resistances OK.

Andy

Hi,

that is most probably the correct one - if it is not a late 450 SL. Can u make a photo of the black cap and also tell me the Bosch no of ECU. There are 2 possible combinations for 450 SL. But you most probably saw that in appendix A.

Here is the cap:  www.dropbox.com/s/5m6i8v2duihq14k/IMG-6205.jpg?dl=0

ECU is Bosch 0 280 002 005

Andy

Hi,
when I look at the lid of the cap, I believe to see scratches from a tool that has removed the lid. But I am not sure. Judge yourself.

I see what you mean. I can't tell if the cap has ever been removed.

Suppose the MPS has been adjusted sometime in it's life. Should I remove the cap and adjust it to reduce the shaking so I can drive it to a garage where they can weld in a bung for an O2 sensor?

Added J19 to my original post.

Andy

Hi Andy,

there seems to be a disease in the US that people try to "detune" those MAP sensors. Maybe because they install an oxygen sensor or maybe because they believe to get higher performance. For years I have not seen a single 0 280 100 100 MAP sensor on reimported cars in my workshops  that has not been detuned. After retuning those 450 engines mostly run well. I write mostly as there are of course also possibilities of additional problems. That is why I am always suspicious on these MAP sensors.

If you see marks of an opening of the lid, bring it to Bosch Classic in the US and ask them to send it to Bosch Classic in Germany for tuning.