Pcm Code E53, Distributor Signal Interrupt: Description
WARNING: This page is about a different car, the 1992 Cadillac Fleetwood and 1992 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
PCM Code E53 is set if PCM does not receive distributor reference pulses from HEI for more than .4 second. Because PFI system requires HEI pulses in order to fire injectors, most occurrences of Code E53 will be accompanied by a stall.