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Vintage Cars/1973 450sel stalls when throttle opens

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Question
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.

Answer
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

https://www.mbca.org/star-article/january-february-2011/myths-and-magic-bosch-d-jetronic-fuel-injection

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Ron

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I can answer questions on W114/ W115 /W(R)107/W123/W126 Mercedes models 1967-1985. I have rebuilt many of these cars and have problem solved many issues. I have access to much of the technical data and have deailed 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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Maintain, restore vintage Mercedes (W114/W115 /W107/W126)

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Ronnies Diesel Shack

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Vintage Forum Member on many List serves

Education/Credentials
College Graduate. Self proclaimed and taught Mercedes shade tree mechanic.

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