Surging 400E - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 06-17-2015, 12:06 AM Thread Starter
BenzWorld Junior Member
Date registered: Apr 2015
Vehicle: '93 400E/S500
Location: Los Angeles
Posts: 17
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Quoted: 4 Post(s)
(Thread Starter)
Surging 400E

I bought a 93 400E with a bad motor not long ago and ended up rebuilding a M119 from a S500 as a replacement. The swap was.....interesting. Not overly complicated as I only used the long block from the S class donor car and retained everything else from the original 420 motor. I have encountered a problem I don't know how to resolve. At idle the motor surges fairly rapidly by about 100 RPM's. At driving speeds from about 2000 RPM on up there is a major surging problem. I don't know how to get the fault codes as there is no code box like the one found on my E320. Also wondering if I missed something that needed to come with the S500 to the 400E engine bay. Anyone have any knowledge in this area that may help me correct this problem? Without a code reader I'm stumped. What makes the engine surge?
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