Storm L4-1600cc 1.6L SOHC (1990)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Fuel - Low or Rough Idle Following Deceleration
Number:
92-233-6E
Section:
6E
Date:
JUNE 1992
Corporate Bulletin No.:
236510
ASE No.:
A1, A8
Subject:
LOW OR ROUGH IDLES FOLLOWING DECELERATION
Model and Year:
1990-92 GEO STORM
Condition:
A limited number of Geo Storm R-cars may exhibit low or rough idles immediately following a deceleration.
Cause:
Original ECM (Emission Control Module) calibration did not fully address idle instability at ambient temperatures over 80 degrees F. In severe cases,
the low idle may result in a stall. If normal service procedures do not correct the condition, the following calibrations have an improved idle air control
feature which will stabilize the rough idles.
NOTE:
Some automatic transmission equipped vehicles already have the DOHC engine (VIN Code 5), some late build 1991 base models with SOHC engine
(VIN Code 6) and all 1992 base models with the SOHC engine (VIN Code 6). No 1990-92 GEO Storms with manual transmissions were produced with
the improved I.A.C. feature.
Warranty Information:
Labor Operation: J6355
Use applicable labor time guide for labor hours.