Engine - Vehicle Fails State I/M Emission Test

Bulletin No.
92-041

Issue Date
NOV 13, 1992

Model
ALL

Applicable To
ALL

File Under
GENERAL

Vehicle Fails State Inspection and Maintenance Emission Test

SYMPTOM

Some vehicles with properly functioning emission control systems may fail certain states' tailpipe emissions test.

PROBABLE CAUSE

The following conditions may cause the car to exceed the state standards:

^ The vehicle is not fully warmed-up.

^ The idle period is too long.

^ The engine is shut-off, hot-soaked and restarted.

^ The underhood ambient temperature is very high.

NOTE:
All Honda automobiles do meet the U.S. E.P.A. and California emission standards when tested under the E.P.A. certification test procedure.

CORRECTIVE ACTION

Do the following before conducting the tailpipe emissions test.

The emissions test should be performed with the car at normal operating temperature. Before testing be sure the car has been driven for several miles at 25 mph or above, and test the car as soon as possible after driving.

1. Keep the engine at operating temperature (the cooling fan has cycled on and off twice).

2. To normalize the system, raise the engine speed to above 3500 rpm and allow the throttle to snap closed to idle.

WARRANTY CLAIM INFORMATION

None:
information only.