I never worked on the EHA and am not familiar with it's function.

I just did a quick search and saw that it is fuel related so I would definately ask the forum if the EHA could cause your symptoms.

Possibly start a new thread and do a search to see what you can find out.

If its disconnected then I'd say that you have an excellent starting point for troubleshooting the problem.

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Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra