Note On Intermittents
WARNING: This page is about a different car, the 1989 Cadillac Fleetwood and 1989 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
Manipulate circuit No. 472 wiring, the MAT sensor and ECM connector while observing ECM parameter P.0.5. If failure is induced, manifold air temperature will jump from its normal value to shorted reading of 291-304°F (144-151°C).