Howdy,
I believe the ALDA lines also can become clogged with buildup - actually
IIRC, this is common on older engines using dino oil and seeing lots of
around town driving. My 91 300D 2.5 seemed to do the same as you describe
when it was new to me (last year) but many miles of my wife driving to work
(110 mi RT) ay speeds of 55-75 have gotten rid of the problem
One other thought - if the AT is not downshifting properly when you are
accelerating hard expecting the turbo to be called on, the car will bog
dramatically if lower gears are not selected. I also have full synthetic in
the AT and engine.
Not sure what controls the shift points on these cars - likely a
combination of kick-down switch, accelerator position and vacuum.
Larry T (67 MGB, 74 911, 78 240D, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
Test Results http://members.rennlist.com/oil
PORSCHE POSTERS! youroil.net
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Porsche Road Test http://members.rennlist.com/roadtest/
.
----- Original Message -----
From: "Peter Frederick" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Monday, March 05, 2007 8:06 PM
Subject: Re: [MBZ] 1991 turbo questions
Lots of possibilites:
Stuck waste gate, so the turbo isn't generating pressure sometimes
Leaking pressure line to ALDA and overpressure valve, or leaking
overpressure valve
Leaking transmission control amplifier so the boost signal doesn't get
to the ALDA
Dead turbo bearings. This can be checked by removing the intake hose
to the turbo ENGINE OFF and spinning the turbo wheel by hand. Any
stiff spots, back to front play, or roughness, it's time for a turbo
cartridge.
Peter
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