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.

Check for throttle shaft and throttle blades binding, weak or distorted throttle spring, cruise or TV cable binding, and/or improperly installed TPS.

Intermittent Code E27 can be induced by resting foot on accelerator during key on/key off for 10 seconds cycle. Check for intermittent open on circuit No. 427 between ECM and ISC.

Fig 1: Code E27 Schematic - Open Throttle Switch Circuit

Fig 2: Code E27 Flow Chart - Open Throttle Switch Circuit