Prizm L4-1800cc 1.8L DOHC (1993)
Manifold Pressure/Vacuum Sensor: All Technical Service Bulletins
Engine - No/Hard Start or Poor Driveability
File In Section: 6E - Engine Fuel & Emission
Bulletin No. 43-65-08
Date: December, 1994
Subject:
No/Hard Start or Poor Driveability at Low Ambient Temperature (Revised Engine Vacuum Hose Assemblies)
Models:
1993-94 Geo Metro
VINs Affected:
1993 units produced beginning with:
Metro XFi P67O8773 (CAMI)
Metro/Metro LSi P672431O (CAMI)
PK2O3427 (Kosai)
1994 units produced prior to:
Metro XFi R674787O
Metro/Metro LSi R6747847
CONDITION
Some customers may comment on a "no/hard start" condition or experience "low power" and "poor driveability" during cold weather (less than 32°F, O°
C). In addition, diagnostic trouble codes 31 or 32 may be set.
CAUSE
Moisture may become trapped in the engine vacuum line between the TBI unit and the MAP sensor and freeze, resulting in a loss of signal from the
sensor. If left uncorrected, moisture may eventually migrate to the MAP sensor, resulting in possible sensor failure.
CORRECTION