Engine Controls - Poor Cold Driveability
Number 86-6(Gasoline)-26 Date 3/86Subject: POOR COLD DRIVEABILITY
1986 6000, FIERO, AND GRAND AM CARS WITH 2.5L L4 (VIN CODE R & U) ENGINE, MD9 3-SPEED AUTOMATIC TRANSMISSION, AND 2.39 (F62), 2.84 (F-17) OR 3.18 (F-75) RATIO TRANSAXLE
Some customer comments on poor cold driveability may be received on 1986 6000, Fiero, and Grand Am models. The comments may range from hesitations, sags, and stumbles to cut-out, usually on first driveaway attempt after cold start.
These conditions may be caused by PROM calibrations that are too lean under some cold start driveaway conditions.
Should any vehicles with above described cold driveability condition be received and normal service procedures do not correct the condition, the following list of service PROMS are available from WDDGM.
Service PROM Model Engine Transmission Axle
16062202 6000 2.5L 3-Speed Auto. 2.39 Ratio
16064305 6000 2.5L 3-Speed Auto. 2.84 Ratio
16060865 Grand Am 2.5L 3-Speed Auto. 2.84 Ratio
16062222 Fiero 2.5L 3-Speed Auto. 3.18 Ratio
Use Applicable labor operation number and labor time for PROM replacement.