Hello,

My 560SEL has been running perfectly for two years! It has 135k miles and maintained well. Yesterday, after running for 20 minutes at 70 MPH I had no acceleration but the car didn't stall. It came back to normal in 3-4 seconds....then did it again less than a minute later. I pulled off the freeway and shut off the engine and it restarted normally. I drove for another hour....freeway; stop and go traffic; 95 degree heat. Last night, after 20 minutes, the same symptoms.....sudden loss of power. I was driving in a 30 MPH zone...I placed in neutral and rev'd.....the rpm jumped to 4k with no problem. The power loss kept repeating for the next 3 miles home. I rev'd in neutral a few more times and if I let up completely on the accelerator the engine stalled sometimes. It always restarted normally.

It should be noted that the idle is smooth; starts normal and quick; does not stumble or sputter when power loss occurs; no backfire.

Thanks for your help!

__________________
All the best,

J. P. Mose
1968 250SL
1970 280SE 3.5 Cabrio
1987 560SL
1990 560SEL

Problem solved! It's a faulty E.H.A. Valve.

__________________
All the best,

J. P. Mose
1968 250SL
1970 280SE 3.5 Cabrio
1987 560SL
1990 560SEL

Great!
How were you able to isolate the fault to the EHA.
mak

I read a lot of postings....but I was ready to send an update! While the problem disappeared after disconnecting the EHA valve, it may have been a coincidence. My mechanic thinks it is bad gas (obtained from Kroger in Atlanta). I am bringing the car to my mechanic (Autobenz in Marietta) and have is diagnosed. I was told the EHA rarely fails.....usually leaks (mine shows no sign of leakage). I will report back.

__________________
All the best,

J. P. Mose
1968 250SL
1970 280SE 3.5 Cabrio
1987 560SL
1990 560SEL

Thanks for the advice everyone!

__________________
All the best,

J. P. Mose
1968 250SL
1970 280SE 3.5 Cabrio
1987 560SL
1990 560SEL