Okay, engine fires up, however it will not stay running. After it fires up it will run for about 3-5 seconds before it dies. If I give it a little throttle, it will stay running, however as I slowly back off on the throttle, the RPMs drop until they get to about 400rpm then it stops. After the engine quits I hear the fuel distributer quit about a half-second later.

For those who haven't read my posts before this is on a 1988 560 SEL on which I'm putting the finishing touches on a top-end rebuild.
*All the electrical wireing goes where its supposed to go, thats been visually verified 3 times by me.
*Most of the vacuum lines are attached properly, however there is a possibility I missed a couple.
*The engine will run, however it is rough until about 1200RPMs where it smooths out. Since the rebuild I've only taken it to 2000RPMs and have not driven it.
*The O2 sensor wires may have been damaged, but I cannot verify this.

Any ideas?

Thanks in advance!


Scott

I had a similar problem a year or so ago, but it happened while driving through a garage looking for a place to park. Sounds to me like it's the idle speed control unit and/or valve. My mechanic told me if one...and I can't remember which... goes the other likely does as well. We replaced both...at a cost of about $800.00...and that cured the problem. She now idles at a steady 475 RPM and runs like the proverbial top.

__________________
Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000