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

Vac Hose Assembly:

Revised engine vacuum hose assemblies have been released with an improved routing designed to eliminate the possibility of moisture accumulation. Hose assemblies should be installed per the instructions supplied with each kit. These pans should be replaced in addition to checking for the presence of any engine diagnostic trouble codes and taking the appropriate corrective action. Upon completion, install the new hose routing overlay supplied with each kit.

Warranty Information

Parts Block:

For vehicles repaired under warranty, use:

Labor Operation Labor Time

J698O 0.2 hr