1985 280SEL. Spark plugs, wires, and distributor cap were recently replaced.

Engine and trans were swapped from a 78 280SE euro. Whatever is missing from this photo was taken from the original engine:



The car dies when hot and idling with the A/C on and in gear. Switchover valve suspected, and it's not even hooked up.





Where do these vacuum hoses hook up to?


A few other vacuum maladies:

This is not hooked up to anything.


Nor is this:


This is plugged:



A few more details: Cold starts are immediate, hot starts require giving it some gas. Seems to be running rich and eating fuel excessively. Has a misfire every few seconds MOST of the time but not ALL the time.

Any guidance on these issues would be greatly appreciated.

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1982 280SL - Petrol Green
1994 E420 - Brilliant Silver
1995 E320 wagon - Smoke Silver

Fuel mixture & warm-up are related to fuel pressures.

Is the electrical connector on the warm-up regulator connected?

The vacuum brake booster line should have a vacuum port for the connections to the central locking system.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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Retired Moderator

Thanks for the reply, Doc.

I'm 90% sure the WUR is connected but I'll double check it. The RPMs go very high on cold starts and come down to normal when warm, so I'm guessing it's working.

I thought W126s had a separate vacuum system for central locking, with it's own electric pump? Central locking works perfectly on the car.

__________________
1982 280SL - Petrol Green
1994 E420 - Brilliant Silver
1995 E320 wagon - Smoke Silver