Engine - Excessive CO Emissions

90honda05
Model Applicable To

'84/85 ALL
PRELUDE
File Under Bulletin No.

84-051
ENGINE Issue Date
OCT. 1, '84
State Emission Inspection Tests


PROBLEM

1984 and '85 Preludes won't meet state idle or high idle CO standards if tested after the car has been idling for three minutes or more.


CAUSE

To prevent the catalyst overheating, the secondary air and feedback systems shut off automatically after idling for three minutes.

NOTE: These cars do meet EPA standards under the Federal Test Procedure (under normal driving conditions, a car will seldom remain stationary for as long as three minutes; thus the secondary air and feedback systems will shut off only infrequently).


SOLUTION

Turn the engine off before testing, then restart and test within three minutes.