My 1991 2.5-16 starts perfectly from cold but if i turn it off after starting, it wont start again. it matters not how long it was running for. I can get it started again with a little squirt of easystart. However once running it is reluctant to rev on anything more that a very light throttle.
Any ideas ?

Could be bad temp sensor...
Bad O2
Bad KE control unit..

Sounds like once the car goes into open loop, regulated the mapping is wrong.. So it's either a bad input or an incorrect processing of said input.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
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Enthusiast Service, Restoration & Tuning.
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OF course make sure that the secondary ignition system is in good shape. THEN...

I would start with a basic fuel pressure test.
The CIS fuel injection system is all about the difference of system pressure & lower chamber pressures.

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I would Hope a 2.5 16V would be Very well maintained @ this point...ya know?;-)

You might also check your voltage @ the EHA once warm..

Jonathan

__________________
Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
Follow Us on Facebook!
Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta