I had replaced the o-rings on the eha on my car before, but it still leaked. Dealer said the plastic that its made of will end up pitting over time and the new o-rings are useless to help, so i had to just get a new eha.

Did you maybe kink one of the lines when you were moving them to take out the injectors?

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1988 190e 2.3 with 91 engine