I have a 1990 560 SEC, It is a V8, I don't know what size it is, But would like to know, I don't know how to tell, The car is nice, But has 224.778 miles on it, Anyway, It has a dead miss at an idle, It appears to be a vacume leak, If I put it in gear and hold the brake and give it any gas pedal at all the BAD miss immediately goes away, So I am sure it is a vacuum leak but I can exactly find it, Using carb cleaner I spray the sides of the intake it smooths out, I spray the injectors it smooths out, I spray under the throttle body is smoothed out, about anyplace I spray it smooths out, It seems like everything on it is leaking, I have been working on this for two day and am sick of it, From what I have been reading on here there are so many things that could be the problem, I think All This Stuff is old, worn out and bad, OK, MY QUESTION IS, If I remove all this injection stuff and adapt a carburetor and a low pressure fuel pump, Will it run, And run right as far as the ignition go's, Don't worry about the carburetor adapting part, I am a fabricator and a welder, That's not a problem, I am just concerned about unplugging the wires ? Is the computer and ignition going to be a problem ?

One of the issues with going to a carb is the lack on intake manifold heat and wet flow. The manifold might not be designed to handle a air fuel / mix. Try to contain the vacuum leaks first, there are also adjustments to the system that need made after the leaks are fixed if it was adjusted to compensate

Have a look at http://www.peachparts.com/shopforum/performance-paddock/368301-560sel-m117-megasquirt.html

This will be your most direct route to fixing the car if expensive / obsolete parts have failed.

The displacement is 5547cc; or 5.5L (and a little change); or 338 CI.
The ignition system will operate correctly with the injection removed.

Air leaks are quite common on those engines at that number of miles; the fix is to replace all the air seals in the system, from the plenum on up.
You description also suggests that the mixture is set just a bit lean at the fuel distributor (FD).

Just sell the car.

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Allen Kroliczek
Oak Grove Autosport | Oak Grove Autosport
01 G500, 82 300TD, quite a few more.....

Thank you guys so much, I really do appreciate your help.

This made my day.

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I'm not a doctor, but I'll have a look.

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