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RE: Dead air flow sensor ..
At 11:28 AM -0800 11/5/99, Buchholz, Steven wrote:
>
>... clearly we're not all getting the full conversation here ... but in any
>event, one of the functions of the Motronic system is that right after the
>engine is shut off, the computer runs high current through the wire to heat
>it to 1800 degF for one second to burn off any such accumulation.
Try coating something with a little oil, then burn it off with a
torch. Motor oil...especially the kind that's filthy with carbon and
other wonderful ingredients from running in the engine...doesn't just
just "burn off" clean. _Everything_, no matter how pure, leaves some
sort of film or deposits, when it evaporates or burns.
The burn-off cycle on the MAF sensor doesn't really clean the wire.
Rather, it bakes on whatever doesn't burn off; carbon and other
wonderful things. It does this so well that cleaning the wire
becomes impossible. Trust me, I tried every substance in the book to
try and clean the wire in Brandon's sensor. I tried alcohol,
clearvue glass cleaner(acetone and a bunch of other nasties), simple
green, straight acetone, and finally goof-off. Nothing came off the
wire...the q-tips stayed completely clean. One side of the wire
sparkled, the other(engine side) was a dull black. I suppose it's
possible that the clean cycle could have failed, but that would
probably have resulted in removable residue of oil.
The company that does repairs probably just replaces the wire, since
it's the only component likely to go bad. I'm guessing they
re-calibrate the sensor using the potentiometer under the blue plug
on the side of the control box
Brett
----
Brett Dikeman
Artel Software 617-451-9900
381 Congress Street 617-451-9916(fax)
Boston, MA 02210 http://www.borisfx.com