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Vintage Cars/1973 450sel stalls when throttle opens


1973 450sel -- idles fine engine runs smooth -- fuel pressure at 35 psi checked aav and open cold and closed when warm

as soon as throttle plate moves engine dies.  starts immediately back up.

idles smooth no surging -- spark plugs clean -- tune up recent

I thought maybe about fuel volume(flow) but runs fine until throttle plate is moved just the slightest.

The MAP and ECU are the next things I'd check. Check the vacuum lines o the MAP. Make sure there are no leaks.    The ECU could also be at fault make sure big plug is
firmly attached and free of corrosion.   

Good go to link

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I can answer questions on W110/W111/ W114/ W115 /W(R)107/W123/W126 , and Finny Mercedes models 1962-1985. I have rebuilt many of these cars and have problem solved many issues. I have access to much of the technical data and have detailed instructions on fixing the most common issues. Vintage US 1950-1989 and other foreign cars as well If you are going to ask me about car value, please provide ample information on service history, rust issues, and current "needs". Pictures are helpful. Disclaimer on value - I can only give you data on what the market is bringing, and may not be what you want to hear!


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