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#1
12-20-2003, 02:46 PM
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Attention: Mercedes Drivers
This is what my mechanic called some sort of fuel regulator. This is on a 1972 280SEL 4.5L, but I assume that it is similar on most Mercedes from this era. The plug that goes into this regulator can go either way. He said that he sees it backwards A LOT. If you take the rubber cover off of the plug, you will see a white wire with a green stripe. Make sure that this wire is plugged into slot #7, NOT slot #15. He said that this will affect idling speed and gas mileage. Just thought I would pass the word around.
Tim Last edited by Tim's__Benz; 02-09-2004 at 10:45 PM. 
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#2
12-20-2003, 02:46 PM
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Here is a different picture of it. Sorry about the quality.
Tim
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#3
12-20-2003, 05:39 PM
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That's the MAP sensor and a major "Brain" of the D-Jet EFI system
I would imagine that improperly connecting a plug to it would screw up a car's running! So would turning that allen screw as far CCW as mine was 
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Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k
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#4
12-20-2003, 10:53 PM
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That air cleaner looks pretty clean for being 31 years old
 Peace Out David
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_____________________________________________ 2000 Honda Accord V6 137k miles 1972 300SEL 4.5 98k miles _____________________________________________
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#5
12-21-2003, 01:55 AM
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I would worry less about the electrical connection than the vacuum line that comes off the other end. Check it out closely for cracking. The line runs from that sensor to the left head. I couldn't find the braided vacuum line to replace so I use fuel injection line and a small hose clamp for the head end. Tight quarters in there to tighten the clamp but doable.
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Mike Tangas '73 280SEL 4.5 (9/72)- RIP  Only 8,173 units built from 5/71 thru 11/72 '02 CLK320 Cabriolet - wifey's mid-life crisis 2012 VW Jetta Sportwagon TDI...at least its a diesel Non illegitemae carborundum.
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#6
12-21-2003, 12:25 PM
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Yeah, the MAP sensor is a bit important.....
When I saw the plugs it was running a bit lean (stark white platinums), but by recent reports it has plenty of power, so it cannot be too bad! If the MAP is bad, the engine usually runs so righ it blows black smoke. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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