Many people have obtained renewed performance by adjusting or removing the ALDA, and cleaning out related vacuum lines. Do a search on "ALDA" and you will find lots of information.

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1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine