I notice the mechanic took out the
carpet on the front right sit and
set something under it during the
car tuning. What is he try to tune ?
Is it some performance related tuning ?
(year manufactured 1988)
Thanks in advance.

One of the only items under the carpet is the cruise control computer. Nothing inside the car could help with performace tuning.
The connection for the oxygen sensor is under the pass. side carpet, maybe it needed replaced?

Thanks MB Doc, I have clarify with him,
(my mechanic), he need to disable the
oxygen sensor while perform the CO
tuning.
Thanks again.

I hope that that your technician used a Lamda meter to set the fuel mixture after testing the CO. THE COMPUTER likes to control the fuel mixture at an even on-off ratio!!

Unless the technician was testing the exhaust output upstream of the catalitic converter the CO readings were invalid anyway. Only adjust fuel mixture with a Lambda meter.

------------------
Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

How does the lambda meter look like and what
does it measure ? Any factory value for
lambda tuning ?
Thanks