Hi, mbtjc, euro 287 and everybody who reply to this Help msg ...

Referring to euro 287 -- I don't know whether he had done the compression check. But I check my spark plugs, the white insulators were all pure white, no oil traces, engine has NO smoke at cold and at any speed. Oil consumption was about 1 quart for every month for city driving (around 700 miles I guess). The cams new or not, I don't know. But from I've seen on them when I replaced the valve cover gaskets, they don't have wear, burnt or discolorig markings on both of them. The timing chain still brand new with grey color on it. Guess the previous owner had done a cam & timing chain job.

Forgot to mentioned that my mechanic had put new engine mounts, engine shocks, auto-trans mount and differiential mount.

For c/o reading, the mechanic did using the MB tool connected to the scoket from my car and adjust it accrodingly. My car had gone through DMV emmission test and passed right away even before I had done anything to it. For the ignition side, he used
a SNAP-ON engine diagnostic scope to check the ignition -- shown by all eight dancing bar graph -- from what I've seen before replacing the fuel injectors -- all 8 bar graph were not even. After replacing all injectors, holders and 2 air intake rubber hoses connected to the injector holder, the car ran much faster and much better gas mileage. But after 2 days, the car suddently feel a drop of power and rough idle back for haunting.

That's the second time he did a scope and replaced 2 injectors.
The car restore the power -- But FAILED 2 brand new BOSCH -- Made in Germany fuel injectors at the SAME TIME -- that's much to say about German engineering and QUALITY CONTROL !!! He told me the rest of the injectors has ONE year warranty.

Well, for the compression, cylinder leakage and fuel distributor test -- things like that I don't know he did it or not. But he had spend 4.5 hours woking for the whole job including re-route all vacunm hoses. The rough idle was 90 % gone -- not completely -- when we did a short test drive and the next several days....

I know engine like mine with more than 172K miles need a complete check -- from top to bottom. Then I will know the root cause and so for the MB community for answering this help msg.

Thanks for mbtjc, joep, chowpit and euro 287 for taking their time and combined MB mechanic experience for answering my message. This place is great !!! Any more suggestions are very welcome. Bye for now.


Regards.