I just went through the ABS thing on my car. The question is, does the light come on as soon as you start the car, or does it come on after you have driven forward for a couple of seconds?

The "flaps" you are talking about for the recirc is behind the glove box, when you push that door open that is full recirc, when it is all the way rearward, that is all fresh air. I would recommend taking out the glove box and observing how it behaves while driving. While I was looking for replacement pods for my car, I propped that door to full recirc using two wooden dowel rods.

Sorry, can't help on the egr, arv except that when I plugged them both and removed the egr I got a little more low end power. I also removed all the vacuum tubing and switchover valves for them at the same time.

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----Adam

1985 300SD 322,000