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Originally Posted by sptt
I'm with you. '91 300E. I have done the same and everything seems to improve then it goes back to the same. If I turn the key before starting and prime it 4 times, it will start strong. Have you tried that? Supposedly if it does, you don't have enough residual fuel pressure. I've seen a lot about replacing the EHA valve too. Everyone seems to have this same ongoing issue. I'm perplexed. Wondering if a stronger battery with more cranking amps will help.
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My EHA was bad too. The case had a crack in it causing fuel to leak. I've done a lot of things to get the car running well. It is now down to just a few small things. If I can get a bit better starting and idling characteristics from the engine then I will be pretty happy. The only thing I may have missed is the oxygen sensor. I keep seeing them be mentioned to be replaced every 60k miles or 100k km. With my mileage that would put me right in line for a replacement, even though the car passes emissions inspection with excellent numbers.