The emperor ... er, the intake air temp sensor ... has no clothes

Tom Mullane tmullane at
Fri Jan 31 13:10:43 EST 2003

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I believe the emperor's robe exists only to protect him during shipping.  When he is installed, you should remove the cover to reveal the tiny wire.

Tom Mullane
91 200Q
91 CQ
99 A6Q

Date: Thu, 30 Jan 2003 17:36:06 -0800 (PST)
From: Scalmanini Steve <sscalmanini at>
Subject: The emperor ... er, the intake air temp sensor ... has no clothes
To: 200q20v at, sjmauto at

I removed the intake-air-temp sensor today to test it,
after it threw a code a few times, and found it
missing its end-cap/cover.  I assume the engine ate it
some time during its 180K mile life.

It tested OK (500 ohms at the sensor, 525 at the ECU
connector, at ~68 degrees F [such is California
between winter storms]) so I reinstalled it for the
time being.  But, should I worry about the sensor
hanging naked in the manifold breeze indefinitely?

I'm more worried about installing a replacement sensor
that I saw has a black looks-like-vinyl plastic end
cap that covers the entire end of the sensor inside
the intake manifold.  However, it pulls off with only
a gentle twist, which undermines any confidence I
would otherwise have that it would stay put.  Why risk
having the engine swallow another one?

If I had to replace it, I think I'd put one of those
skinny, short (~4") tie wraps around the base of the
cover to hold it in place.  Does anyone know a better
way to deal with this?


Ukiah, CA

PS: Maybe this explains why my compression is high in
one cylinder (166, 173, 167, 167, 167); could the
remains of the cover have become a seal around
cylinder #2's valves?


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