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Originally Posted by Jeremy5848
I thought that the 603 would be like the 617, in which one of the three terminals on the screw terminal block near the battery is for the starter. You can jump one terminal to one of the other two and the starter will run. In my 603, near the brake booster, there's the idle speed select plug and another three-pin plug and socket with a heavy violet/white wire to the center terminal. I shall have to examine the schematic in more detail.
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Bingo - that's the one. There's even a nifty wire harness you can buy from MB for five bucks or so that connects to it (but you have to supply the switch to trigger it.)
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Originally Posted by Jeremy5848
With what would a new oxidation catalyst plug? In any case, the poor performance existed before the recall was performed. It was no better (or worse) immediately afterwards.
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Soot - it would plug with soot, or contaminants from fuel additives. But if it was the same before AND after the retrofit, that pretty much rules out the trap. I doubt anything downstream in the exhaust is plugged.
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Originally Posted by Jeremy5848
A few minutes ago, driving the car, I made some more 0-60 tests: about 25 seconds. Interestingly, it doesn't matter whether you give the engine part throttle or full throttle, the times are about the same.
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With the ALDA removed, could you press the plunger down with your finger, and did it move freely up & down? It is under moderate spring pressure upwards, so it could take some pushing to make it move down. But it should bounce back up. I have heard of a plunger that was frozen in the down position, which is the "NA" or "Min" fuel position. If that was the case, the IP would never deliver additional fuel, no matter what the ALDA did, or if the ALDA was removed. I think that would be my next inspection, prior to letting a new mechanic look at it. If that is working normally... I'd be pulling the pump and having a Bosch shop run it on the calibration stand to see what the fuel curve looks like.
