Similar, yes.
The .971 does not have a switchover valve between the intake and ALDA, runs direct, yours sounds correct.
On the .971 the overboost protection runs a different switchover valve behind the right headlamp which interrupts the vacuum line to the turbo wastegate and drops boost.
My .971 (W140) got the typical oil/carbon mist clog in the boost line, killed my boost enrichment and the line/fitting needed to be cleaned to restore power. Mine will spin the tires with the brake on (found out by accident when troubleshooting my boost issue) when all is working properly.
Also in the .971, the wastegate defaults to open. It is open when you start the car, and unless all of the stars align and everything is happy in the computer, it will stay open. I have also had a switchover valve in the 140 leak vacuum, which again killed my boost. If you're not familiar with this system look up vacuum wastegate here, you should find lots of frustrated stories troubleshooting this system on the '90-'93 300D.
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Originally Posted by wwii
Same or similar for 603.971 ? ?
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