Engine - Rough Idle or Hesitation

90ford34 Article No. 90-21-9
^ HESITATION - DURING TIP-IN ON FIRST TWO ACCELERATIONS - CARS BUILT BETWEEN 10/1/88 AND 7/30/90

^ IDLE - ROUGH DURING INITIAL COLD START-CARS BUILT BETWEEN 10/1/88 AND 7/30/90
FORD: 1989-90 TAURUS SHO


ISSUE: A momentary, rough idle at initial cold start or a tip-in hesitation on the first two accelerations may bre caused by an EEC IV processor that has a lean calibration. Summer blend of fuels also contribute to these symptoms. These symptoms are most noticable in ambient temperatures of 60-90~ F (15-32~ C).

ACTION: Install a new EEC IV processor that has revised operating strategy. Refer to the service part application chart for the correct EEC IV processor selection.


NOTE: REFER TO THE APPROPRIATE MODEL YEAR SHOP MANUAL FOR INSTALLATIONS DETAILS.
PART NUMBER PART NAME CLASS

FODZ-12A650-SA EEC IV Processor - 49 States B
FODZ-12A650-RA EEC IV Processor - California B

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION DESCRIPTION TIME
902109A Install New EEC Processor 0.6 Hr.
DEALER CODING
BASIC PART NO. CONDITION CODE
DRIVE J4
OASIS CODES: 608000, 608400, 611000, 611500