I send my 190E (1988) to local benz service center for tuning and I managed to see the ignition timing reported by the datascope is about 17-18 degree at 750rpm. According to the service manual, the BTDC value should be around 10 degree for my model (190E-2.0). The tech told me they can't lower it since it can't be change and do nothing about it.
I am confuse and appreciate if someone can share some idea and experience on the
following questions.

1. Is the timing too high at 17 degree and
will it cause demage to the car ? The
engine shake once a while and wonder
the high timing is one of the cause.
2. How can I lower it ? Reprogram the CIS
EPROM ? or could it be some component
failure which cause the timing to go up ?

Thanks in advance
AL


[This message has been edited by altan (edited 06-18-99).]

[This message has been edited by altan (edited 06-18-99).]