1973 350 slc - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 01-20-2004, 03:57 AM Thread Starter
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Date registered: Jan 2004
Vehicle: 1973 350 slc blue.
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1973 350 slc


I wonder if anyone could give me a few tips regarding a car that I recently purchased. I am a very satisfied
owner of a pair of MB 190s that I have owned over the last 10 years.

However recently I also bought a 1973 350 slc V8, which I felt would be an amusing hobby. Unfortunately my local mechanic isn't very technical or intuative.

The car runs on a contact points ignition system and has tne MB fuel injection of the period. Overall it is in very good condition.

To cut a long story short I dropped the Panzerwagon up to the aforementioned mechanic for some routine servicing. This included new points, condenser, coil and ignition leads. The fuel filter seems to be a new
fitting. I took this step as the car had started to run erratically. Somtimes stalling, not always starting when hot and not always firing on all 8 pots.

The trouble is now the engine will fire up, but only runs for a few seconds before cutting out. It restarts
easily but cuts out again as before. Fuel pump seems to be working fine (as it is audible building up pressure).

Also I have ne owners manual, so exuse me for my stupidity but I can't figure out how to release the front seat backs, in order to allow passangers into the back.

I wonder if anyone out there in MB land might give me some help and advice ?


Gerry Huet

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post #2 of 2 (permalink) Old 01-20-2004, 06:04 PM
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Greg in Oz's Avatar
Date registered: Aug 2002
Vehicle: 350SLC, 500SLC, 300TE, 190E2.3 Sportline
Location: Sydney, Australia
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RE: 1973 350 slc

Be sure that the new ignition points have been set correctly (a dwell meter should be used rather than simply setting the gap). The fuel injection on this car is Bosch D-Jetronic. You may want to search the various forums using this term. It is a fairly basic system that relies on timing signals from trigger points in the bottom of the distributor (these can cause mis-firing on high mileage cars). Fuel mixture is determined by a manifold pressure sensor (mounted on the left side of the engine bay in the SLC, these can cause mixture problems) and coolant and air temperature sensors. Fuel pressure regulators maintain correct fuel rail pressure for the injectors. Contacts operated by the throttle spindle give fuel enrichment on acceleration (and at wide-open-throttle in the case of the 4.5 engine) and fuel cut-off on the overun (this unit must be correctly adjusted relative to the throttle position). The heart of the system is an analogue equivalent of an ECU (mounted above the passenger footwell in the SLC). With the symptoms yours has I would be checking for fuel starvation (fuel rail pressure) assuming that the ignition system (points etc.) that has recently been worked on is in order.

Regarding the seat back locks for the front seats on the SLC, they are vacuum operated. They should lock with the engine running and doors closed. Opening a door or pressing the black buttons either side of the rear seat (near ash trays) should unlock the front seat backs.

107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex, (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.
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