just replace the coolant temp sensor and reset the computer on the KE-5 Jetronic....costs like $40....

I am stunned as the lunacy of repair costs/diagnosis...incredible...no wonder people are not willing to buy these cars....

where we found sport rental car

I'd try replacing the coolant temp sensor...I think they call them thermstors or some such nonsense...a resistor that regulates voltage according to temp change....big guy in the sensor world..very much like the O2 sensor....another large cat in the jungle...good luck

there is no warm up regulator on a CIS KE-5 injection system....it's all controlled by several different sensors contributing to the control module. The coolant temp sensor, the oil pressure and the intake air temp sensor and O2 sensor all contribute, but in the final analysis, it's the main ECU that makes the final determination as to how to handle the situation.
Warm up regulator? What is that? the thermostat?

and further more, CIS is considered 'mechanical fuel injection', not EFI...get with it cats.....

I just got a 76 450SL, was not running, replaced the Fuel Pump Car Starts now. However it will not start unless with the Key in the Ignition turned far right (not starter engaged) and pressing down on the air diaphragm to let fuel into the injectors for 10 sec or so to get 'The screeching sound' then I can crank the engine and it will start, runs up a bit rough for a min or so till I press the gas down and get revs up then it smooth’s out and idles and runs great.

With those symptoms’ and further reading I took apart my Warm Up Regulator and soaked it in gas, used some compressed air through the 2 fuel lines (not the small vac diaphragm though). and reassembled it. It did not make any difference. However today in looking at some Drawings of the WUR's I see there appears to be a "Rod' or "Pin" (see pic) between the Top inside where the Fuel Enters the WUR Chamber and the top of the Cone that sits over the Spring. Mine did not have any "Rod" or "Pin" as illustrated. Just the 2 Springs The Cone and Thermal Element. Should there be a "Rod" or "Pin' between the Cone and the Top Inside of where the Fuel is delivered? See Red Arrow on my attachment.

Any advise what else I should look at or for? Air Temp Sensor?

I am considering purchasing the Unwired Unit, it looks like a nice reliable improvement.. allthough budget is limited.

Thanks,

Scott

Whatever that rod is called, yes it is supposed to be there. The unit won't function without it.