RE: 164 RPM & Timing Sensor

["Jeff Greenfield" <alfaguy@xxxxxxxxxx>]

No direct experience with this problem on a 164.

But, the only way to tell for sure if it is the RPM or TDC sensor would be
to check the signal with a scope (preferably both when working normally, and
when acting up, then compare the two). FWIW, these sensors usually either
work or don't work.

You may want to measure the resistance of the coolant temperature switch, it
could be going out of range which could cause very poor running.

Other than that, check all the usual obvious simple things ... plugs, wires,
cap, rotor, grounds, etc.

HTH,

Jeff

-----Original Message-----
From: owner-alfa@domain.elided [mailto:owner-alfa@domain.elided] On Behalf Of
Riso, Antonio
Sent: Tuesday, July 29, 2003 12:49 PM
To: alfa-digest@domain.elided
Subject: 164 RPM & Timing Sensor

Have any of you had any trouble with this sensor?  My 164 stumbles terribly
after I sit in traffic for a while.

There seems to be a temperature threshold (in the engine compartment) that
triggers these symptoms.  When this happens, the car idles poorly, sometimes
it stalls or idles around 300 - 400 RPM, and it will not accelerate higher
than 1600 RPM.  If I let it cool for a while, it will work fine until a
certain critical temperature is reached.  So far, I have tried another
airflow meter and another coil with no success.  I suspect the RPM sensor or
some other sensor is shorting out beyond a certain temperature.  If any of
you have any experience with this type of problem, I would appreciate if you
contact me off-line with suggestions on how to proceed.



Thanks in advance,



Antonio Riso

1991 164L
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