Hi!
I am new to MB's. I just bought one for my daughter from a girl headed to Germany for the Army. It is a 1993 400E. She said it runs good, but I am having a problem I just can't seem to locate. I trailered it home, just to be on the safe side. It ran great after I got it back to the house. I drove it about 15 miles, just to feel it out. When my daughter tried to start it the next time, it would start and idle OK, but when the accelerator is depressed and RPM's reach about 1000, the engine starts revving up ap and dropping back between 1000 and 1500 rpms all by itself. when you let off, it goes back to a pretty smooth idle, around 700 rpms. I checked around for vacuum leaks; the only thing I found was some gas in the vacuum line for the fuel pressure regulator. I figured it must have a cracked diaphragm, so I replaced it. No change. I bought a hand-held, LED code reader and pulled fault codes off the Internet. I scanned and cleared all the faults at the 38-pin connector from the diagnostic, base, LH-SFI, CC/ISC and distirbutor ignition modules. After clearing them, I ran the engine (same problem) and re-checked the codes. The diagnostic, distibutor ignition and LH-SFI modules all came back with the same fault- camshaft position sensor errors. The sensor was cracked, so I replaced it. Still have the same problem, but no more camshaft sensor codes. A couple things that make me wonder: The diagnostic module isn't giving me any codes, but will not give me the "no fault found" single blip. The CC/ISC module gives me a code 11, "fuel safety shutoff to LH-SFI control module", but I can't check it on the pins called out in the codes page. It says I should be using pins 1, 14 and 16 for the W124, but there is no contact in pin 14. I checked it using pins 1, 3 and 7. I don't know if this is a problem in itself or not. I have all the fault codes originally stored and after I cleared them and again after I installed the new camshaft sensor. Any ideas?

Bob Bowers (Erin is my daughter)
'93 400E (1st one)