Months ago I started getting hesitation when driving on the interstate. Filters of course, I replaced those no fix. I did find alot of bubbles coming in, tightened the lines at the back and the went away. Then a month or so later I started getting a death rattle when applying lots of torque at low rpm and only under boost. Never at idle or reving in neutral. A year or so ago when I did the valve stems I found that one of the valve was sticking. Of course I assume that this is my death rattle. However after listening to a video the other day with similar symptoms I am leaning towards the pump causing my problems. Pump has been heavily modified but is also probably running a bit advanced. I have a replacement pump that looks recently rebuilt which I am going to put on first before I get involved in anything to expensive (head). I will probably do a compression test at the same time since all that stuff is in the same area.

Suggestions?

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

If it's only under boost, I'd probably check the turbo for play first. It's easier than the compression check and swapping in an IP.

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1967 Mustang (Resto Project)
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By under boost I mean preboost.

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42