93 mercedes 300ce again
 

Just as a followup, the EA started making noise and the car would barely move. We replaced it last week (Mercedes had a rebuilt IN STOCK for 900). So far, so good. No more lights or limp modes. Thank you for all of your time and responses.

Hi again,
after replacing the throttle actuator, the car has been running fine, but the check engine light came on when starting it. We have code 04 secondary air injection and code 26 trans upshift delay. Neither code is in current history. We checked pins #8 and 14 and there are no codes. The car continues to run fine. any suggestions?

First start of diagnosis:
On code 4 --- does the AIR pump come on at cold start?
On 26,-- by-pass the delay SOV by connecting the two vac hoses together [ eliminating SOV] Drive car around block and see if shift delay is active.

Archieves both codes ..

Just wanted to follow up with this 93 MB. We located a vacuum line off under the timing cover, and all seems to be well. Have been driving this car for weeks now. No check engine light and runs well. Thanks again.

Now we have a 2000 ML320 that cuts out hot and cranks but won't start. We banged on the fuel tank and the vehicle started, so we replaced the fuel pump. Again, when it gets hot, shuts off with no spark and no fuel pressure, no power to the fuel pump relay. We have cleaned all the ecm connections, checked fuses, harnessess, etc. Any thoughts on this one?