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Originally Posted by BENZ-LGB
Tomorrow I am taking the car to Enrique at Mr. MB Motors. I spoke with him today and he is aware of the 300E stalling issue. Hopefully he will be able to fix it.
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Trust me. Enrique can fix it.
I had a very persistent failure of the upshift delay valve for a several year duration. It would cause a the check engine light to illuminate, and would always trigger a code 26.
Two Mercedes independent shops and the Mercedes dealer in Covina (Penske Mercedes) threw parts at it, until every conceivable part related to this upshift delay function was replaced. But the damn fault code was still triggering, and the car wasn't delaying the shift from 2nd to 3rd when cold.
I dropped the car off at Enrique's shop, and after a week of troubleshooting, he was able to determine that the neutral safety switch had a short in it, which somehow, in a circuitous way, would not allow the upshift delay valve to work.
In the end, I'm not even sure if he charged me any labor for the diagnosis. All I know is that the final bill was low.