EXPERTEC TSB (92-225-6E)

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

COLD START/STALL HESITATION - NEW ECM/REPLACE T/B AIR VALVE

Chevrolet: 92-225-6E

Date: 06/04/1992

Model & Year: 1990-92 GEO PRIZM GSI WITH 1.6L ENGINE

Subject: COLD START/STALL HESITATION

BULLETIN ILLUSTRATION LIST

CONDITION:

Some owners of 1990-92 (prior to VIN breakpoint #NZ035000) Prizm GSI vehicles with the 1.6L engine (VIN 5) may comment on a hesitation, loss of power, or stall condition, while the engine is cold and a quick acceleration is attempted.

CORRECTION:

For vehicles exhibiting this condition, replace the Electronic Control Module (ECM) located in the center of the instrument panel behind the console. P/N 94852501 replaces P/N 94851354 for federal emissions and P/N 94852500 replaces P/N 94851355 for California emissions.

After replacing the ECM, the minimum idle speed adjustment should be checked and adjusted, as necessary, according to the Service Manual procedure.

On 1991 model year vehicles built between VIN MZ053796 and MZO86198, the Valve, Throttle Body Auxiliary Air P/N 94845502, should also be replaced in addition to the ECM. The auxiliary air valve is part of the fuel injection throttle body assembly and is shown on the attached illustration as item #3.

Normal Service Manual procedures should be followed for the above part replacements.

PARTS INFORMATION

Parts are currently available from GMSPO.

WARRANTY INFORMATION