Quote:
Originally Posted by brewtoo
The EHA is effectively "unplugged" when the engine is cold. It does not come to life until the engine is in closed-loop mode.
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I'm not convinced of this. In fact, when my W124 (with 103 motor) was still quite new, the dealer replaced the EHA under warranty in response to hard cold start symptoms. Cleared up the problem. Moreover, according to the FSM, the purpose for the EHA is fuel adaptation in all of the following conditions:
(1) start enrichment; (2) post-start enrichment; (3) warming-up; (4) acceleration enrichment; (5) full load enrichment; (6) decel fuel shutoff; and (7) Lambda control. Pretty much everything involving proper fuel management.