On a OM617 how does the IP increase fuel as the boost pressure rises ? In other words how does the IP see boost then adjust to give the car more fuel ?

There's a plastic tube leading from the rear end of the intake manifold through an electric overboost protection valve then it goes down to the "ALDA" device on top of the IP .

To test, unscrew the 10MM ATF banjo bolt at the IP end of the plastic tube with the engine idling, as soon as you disconnect it the engine should slow down a bit .

The upper end's banjo bolt gets clogged after time as does the electric over boost valve .

Both are easy to clean up / out .

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better

I found my answer

Just trying to be helpful, this comes up time and time again - the search function is your friend

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD