Engine - Detonation/Rough Idle During Cold Start

87ford21

^ IDLE - ROUGH - 5.0L SEFI - VEHICLES Article No.
BUILT BETWEEN 08/16/87 AND 08/29/87 87-21-12

^ DETONATION - 5.0L SEFI - VEHICLES BUILT BETWEEN 08/16/87 AND 08/29/87


FORD: 1988 THUNDERBIRD

LINCOLN-MERCURY: 1988 COUGAR

CALIBRATIONS: 8-22F-R00

WARNING: This modification is authorized only for the listed engines. Peforming this modification on other engine calibrations is unauthorized and could create liability under applicable federal or local laws.

ISSUE: A rough engine idle during initial cold start-up or engine detonation during moderate-to-heavy acceleration in high ambient temperatures with low humidity conditions may be caused by the strategy of the EEC IV processor assembly.




ACTION: To correct this, install a new improved EEC IV processor assembly.

Obtain an Authorized Modifications Decal and list the date, dealer number, and summary of alterations performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.

PART NUMBER PART NAME CLASS

E8SZ-12A650-AC EEC IV Processor B
Assembly

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION: SP872112A
TIME: 1.3 Hrs. DLR. CODING: Basic Part No. DRIVE - Code: J4