RE: <e28> Re: 87 535iS Drivability Problems

["Scott Bly" <scottbly@xxxxxxx>]

One more possibility I just found on my 86 L7 that I recently purchased:
The black rubber like air intake going into the engine was deteriorate
between the accordion like sections.  This allowed air infiltration between
the engine and the valves   controlling air intake.  The amount would vary
depending on the slight movement of the engine and the air filter housing
and connected components.  The only reason I discovered the problem was that
I was changing my air filter when the engine was running.  When I moved the
filter housing the idle raced.  After patching the leaks with silicon and
electric tape (I'm on an budget) the idle speed was over 2000 rpm.
Apparently the problem went unnoticed for years and the idle speed setting
was increased to compensate for the infiltration.

- -----Original Message-----
From: owner-bmw@domain.elided [mailto:owner-bmw@domain.elided]On Behalf Of Tim
Ketterson & Dulce Roman
Sent: Wednesday, February 23, 2000 12:08 AM
To: healeybn7@domain.elided; Igor Chernishov; bezems@domain.elided;
GRobWorkll@domain.elided; Georg Taht; gene; Scott Petersen
Cc: bmw@domain.elided
Subject: <e28> Re: 87 535iS Divability Problems


Hello Dean, George, Gene, Igot, Scott, Rob:

Thank you all so much for your ideas re: drivability problems in my
87 535is.  Even when my car is not "acting-up" it is feeling a bit
sluggish and jumpy...which I would not expect in this marque.
Acceleration from low RPMs is not linear (read not smooth)...feels
herky jerky and even feels like it is "missing" at speed.  Every
BMW I've ever driven is smooooooth so I wouldn't expect this to be
the norm for mine.  This is the first one I have ever owned so I have
many things to learn...

Gosh, in the past week I've had so many suggestions from folks
and they're all sort of different (e.g., fuel pressure regulator, new
DME!!$$, cracked solder joints on DME, damaged catalytic
converter...Karl's is removed, F.I. Temp sensor, air duct to flow
meter / throttle body, throttle position sensor, air flow meter).  The
one commonality here, obviously, is they all center on some
aspect of the fuel delivery / management systems.   Just to
reiterate...my key "intermittent bogging" symtoms have been that
is seems to be worse on rainy/humid days, worse when on incline /
decline (esp the later), when turning a sharp corner, and at take-off.
 I can now get it to "correct" quickly by an oh so light touch of the
throttle (off and on a few times).

I'm not entirely sure what I can do except go through them all one
at a time to rule-out things.  I'll make another post to the group
soon once I know what is going on.   But in the meantime I'm
swamped at work and haven't had any time to work through the
suggestions.   If I can't diagnose the problem would you
recommend that wait till the problem worsens or take it to my
independent BMW mechanic?

Finally, what the etiquette is for posting back to the Digest after
receiving individual feedback from everyone?  Do I forward all the
emails I've received to the Digest to let Richard Welty (the
owner/editor) decide what to post?

Thanks again to everyone.

Regards,
Tim
*********************
Tim Ketterson, Jr.
'87 535iS (Karl)
146K
*********************

Tim Ketterson & Dulce Roman
Gainesville, FL (& Albany, NY)

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