Review by ELMO smith (Posted on Friday 15 August, 2014)rebuilding a cis fuel distributor for M103 300E M104/M103 CIS fuel distributor rebuild process (pictures heavy) I have once made this on my M103 300E and i was very pleased with the results. Note that a new head will cost a fortune and we never know the real condition of used ones so after a lot of research i found the part needed for the rebuild which is this one: After i bought this part, which is basicly the only part that can go bad in a bosch fuel metering distributor, we took the dist off and dissassembled it. Cleaned all the filters inside (many of them) and the next day we putted everything back together with new o-rings seals. The old gasket: Old gasket with o-rings and springs: Head Cleaning: We then installed the distributor and fired the car...started from the first try. During my short period of driving it after that, i noticed a better idle, fuel economy and better performance, Note that my car is a 3.4 AMG but this must be similar to all M104/M103 cars with CIS injection. Its not an easy job and its not a tough one, but for me its totally worh it. Ive done this too on my M103 and the results were similar.
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