Reroute
Surgery Saves Geo Metro
Get the jumper cables;
this Geo® is flat lining! Three technicians rush to the stall where
a little blue 1993 Metro® is barely clinging to existence. The shop's
top drivability technician works feverishly to bring the engine to life.
"It's
got spark and the fuel pressure looks good," shouts the tech. "Hit
the key again!" .Still, no life. Had "Old Man Winter" claimed
yet another victim?
After
a quick consultation through their ALLDATA® automotive information
database, one of the techs rushes to the stall with a factory technical
service bulletin that mirrored the Metro's symptoms exactly.
According
to the bulletin, some 1993-94 Geo® Metros® may exhibit no start,
hard start, low power and poor drivability conditions during cold (less
than 32° Fahrenheit, 0° Celsius) weather. In addition, diagnostic trouble
codes 31 or 32 may be set. The Vehicle Identification Numbers are as follows:
1993
Vehicle Identification Numbers:
Metro®
XFi P67O8773 (CAMI)
Metro®
LSi P672431O (CAMI) or PK2O3427 (Kosai)
1994
Vehicle Identification Numbers prior to:
Metro®
XFi R674787O
Metro®
LSi R6747847
The bulletin
further stated that moisture, trapped in the engine vacuum line between
the Throttle Body Injection unit and the Manifold Absolute Pressure (MAP)
sensor might freeze, resulting in a loss of signal from the sensor. If
left uncorrected, the moisture may eventually migrate to the MAP sensor,
resulting in possible sensor failure.
The correction
is to utilize revised engine vacuum hose assemblies with an improved routing,
which is designed to eliminate the possibility of future moisture accumulation.
Additionally, check for the presence of any engine diagnostic trouble
codes and take appropriate corrective action. Upon completion, install
the new hose routing overlay, which is supplied with each kit, under the
hood.
Parts
Application Table
Following
the procedures described in the bulletin, the technicians inspect the
MAP sensor vacuum lines and sure enough, water is trapped inside. They
quickly replace and reroute the lines with new ones supplied in the kit.
"Try
to start it again," yells the drivability tech. The engine roars
to life - high fives and handshakes all around. This shop's well-informed
staff of professional technicians has saved another vehicle from winter's
deadly grasp.
©
2000 ALLDATA LLC
