BenzWorld Junior Member
Date registered: Apr 2008
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380SL going bonkers...please help
I just spent my last $3K on an '81 380SL (128K mi) 2 days ago. Needed a daily driver but this may not be it. I've had a '69 280SE and a '75 300D.. both were bullet proof and reliable. Are these 107 SL's less-reliable/higher maintanence? All kinds of issues are popping up...on a Benz with 128K mi?
Anyway, the car won't START now. It ran consistently and smooth but It had a high idle (around 1100RPM starting and then 1600RPM after warm-up). So, after checking the Over-Voltage Relay fuse, testing for current in the Idle Control Unit, I finally pulled off the Idle Speed Adjuster (or Idle Control Valve) to clean inside it & perhaps loosen the piston. I tested it with a car battery and it did click repetitively.
I was curious as to what idle the car would be at with the Idle Control Valve completely absent....so I tried to start the car without it. No turn over at all.
I then reinstalled the cleaned Idle Control Valve and then attempted to start the car again......with no success. The only difference now was that the Idle Control Valve is clean and I put hose clamps on the pipes connecting to it because they were loose fitting. Nothing else different.
So what happened?
Did I get air into in the injection system because I tried to start it without that part installed? I tried to start the car for 20 minutes straight afterward with my foot to the floor. If that's the issue, is there an easy way to bleed the system or is it auto-bleeding by cranking it for 20 minutes?
!!!!!!!!!!!!..............My new SL is dead.
By the way, I'm still not sure what was causing high idle.... vacuum lines look OK but I' not certain (car was sitting intermittenly for 4 years). Idle Control Unit does send some voltage (because the RPM's changed when I pulled the plug off Idle Control Valve...which it's connected to right?). I even pulled the oil temp switch and no RPM change occured...so it's not that. Also..there was a strange clicking sound coming from around the Idle Control Unit - in the dash. Maybe a relay of some kind? Is there a relay in the engine computer box in the dash? - because it sounds/feels like it's coming from there.
Well at least the car looks good. So far it's about as bonkers as a Maserati Biturbo I had a few years ago. But I will try to keep hope alive.
Thanks for any help!
Last edited by Chris_Ginsburg; 04-16-2008 at 01:45 AM.